Renewable energy

Source: Wikipedia, the free encyclopedia.
For the journal, see Renewable Energy (journal).

biomass energy plant in Scotland
.
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Sustainable energy
A car drives past 4 wind turbines in a field, with more on the horizon
Energy conservation
Renewable energy
Sustainable transport

Renewable energy, green energy, or low-carbon energy is

human development.[10][11]

Renewable energy is often deployed together with further

fossil energy shrank from 68% to 62%, and nuclear from 12% to 10%. The share of hydropower decreased from 16% to 15% while power from sun and wind increased from 2% to 10%. Biomass and geothermal energy grew from 2% to 3%. There are 3,146 gigawatts installed in 135 countries, while 156 countries have laws regulating the renewable energy sector.[14][15] In 2021, China accounted for almost half of the global increase in renewable electricity.[16]

Globally there are over 10 million jobs associated with the renewable energy industries, with

solar photovoltaics being the largest renewable employer.[17] Renewable energy systems are rapidly becoming more efficient and cheaper and their share of total energy consumption is increasing,[18] with a large majority of worldwide newly installed electricity capacity being renewable.[19] In most countries, photovoltaic solar or onshore wind are the cheapest new-build electricity.[20]

Many nations around the world already have renewable energy contributing more than 20% of their total energy supply, with some generating over half their electricity from renewables.[21] A few countries generate all their electricity using renewable energy.[22] National renewable energy markets are projected to continue to grow strongly in the 2020s and beyond.[23] According to the IEA, to achieve net zero emissions by 2050, 90% of global electricity generation will need to be produced from renewable sources.[24] Some studies say that a global transition to 100% renewable energy across all sectors – power, heat, transport and industry – is feasible and economically viable.[25][26][27]

Renewable energy resources exist over wide geographical areas, in contrast to

net zero carbon emissions by 2050.[32]

Overview

Renewable energy sources, especially solar photovoltaic and wind, are generating an increasing share of electricity.[33]
See also: Lists of renewable energy topics
Coal, oil, and natural gas remain the primary global energy sources even as renewables have begun rapidly increasing.[34]

Definition

Renewable energy is usually understood as energy harnessed from continuously occurring natural phenomena. The

transportation, and rural (off-grid) energy services.[36]

Although almost all forms of renewable energy cause much fewer carbon emissions than fossil fuels, the term is not synonymous with low-carbon energy. Some non-renewable sources of energy, such as nuclear power, generate almost no emissions, while some renewable energy sources can be very carbon-intensive, such as the burning of biomass if it is not offset by planting new plants.[37] Renewable energy is also distinct from sustainable energy, a more abstract concept that seeks to group energy sources based on their overall permanent impact on future generations of humans. For example, biomass is often associated with unsustainable deforestation.[38]

Role in addressing climate change

Deaths caused as a result of fossil fuel use (areas of rectangles in chart) greatly exceed those resulting from production of renewable energy (rectangles barely visible in chart).[39]

As part of the global effort to address climate change, most of the world's countries have committed substantially reducing their greenhouse gas emissions. In practice, this means phasing out fossil fuels and replacing them with low-emissions energy sources.[37] At the 2023 United Nations Climate Change Conference, around three-quarters of the world's countries set a goal of tripling renewable energy capacity by 2030.[40] The European Union aims to generate 40% of its electricity from renewables by the same year.[41]

Renewable energy is also more evenly distributed around the world than fossil fuels, which are concentrated in a limited number of countries.[42] It also brings health benefits by reducing air pollution caused by the burning of fossil fuels. The potential worldwide savings in health care costs have been estimated at trillions of dollars annually.[43]

History

New government spending, regulation and policies helped the renewables industry weather the

global financial crisis better than many other sectors.[44] In 2022, renewables accounted for 30% of global electricity generation, up from 21% in 1985.[45]

Mainstream technologies

Renewable energy capacity has steadily grown, led by solar photovoltaic power.[46]

Solar energy

Main articles: Solar energy, Solar power, and Outline of solar energy
Global electricity power generation capacity 1419.0 GW (2023)[47]
Global electricity power generation capacity annual growth rate 25% (2014-2023)[48]
Share of global electricity generation 4.5% (2022)[49]
Levelized cost per megawatt hour Utility-scale photovoltaics: USD 38.343 (2019)[50]
Primary technologies Photovoltaics, concentrated solar power, solar thermal collector
Other energy applications Water heating; heating, ventilation, and air conditioning (HVAC); cooking; process heat; water treatment
PV system in Bonn
, Germany
Kofu, Japan

Solar power produced around 1.3 terrawatt-hours (TWh) worldwide in 2022,[21] representing 4.6% of the world's electricity. Almost all of this growth has happened since 2010.[51] Solar energy can be harnessed anywhere that receives sunlight; however, the amount of solar energy that can be harnessed for electricity generation is influenced by weather conditions, geographic location and time of day.[52]

There are two mainstream ways of harnessing solar energy: solar thermal, which converts solar energy into heat; and photovoltaics (PV), which converts it into electricity.[37] PV is far more widespread, accounting for around two thirds of the global solar energy capacity as of 2022.[53] It is also growing at a much faster rate, with 170 GW newly installed capacity in 2021,[54] compared to 25 GW of solar thermal.[53]

Passive solar refers to a range of construction strategies and technologies that aim to optimize the distribution of solar heat in a building. Examples include solar chimneys,[37] orienting a building to the sun, using construction materials that can store heat, and designing spaces that naturally circulate air.[55]

Photovoltaic development

Main articles: Growth of photovoltaics, Solar power by country, and List of photovoltaic power stations
Swanson's law–stating that solar module prices have dropped about 20% for each doubling of installed capacity—defines the "learning curve" of solar photovoltaics.[56][57]

A photovoltaic system, consisting of solar cells assembled into panels, converts light into electrical direct current via the photoelectric effect.[58] Almost all commercial PV cells consist of crystalline silicon, with a market share of 95%. Cadmium telluride thin-film solar cells account for the remainder.[59] PV has several advantages that make it by far the fastest-growing renewable energy technology. It is cheap, low-maintenance and scalable; adding to an existing PV installation as demanded arises is simple. Its main disadvantage is its poor performance in cloudy weather.[37]

PV systems range from small, residential and commercial rooftop or building integrated installations, to large utility-scale photovoltaic power station. Building-integrated PV uses existing land and structures to generate power close to where it is consumed.[60] A household's solar panels, and batteries if they have them, can often either be used for just that household or if connected to an electrical grid can be aggregated with millions of others.[61] As of 2022, around 25 million households rely on rooftop solar power worldwide.[62] Australia has by far the most rooftop solar capacity per capita.[63]

The first utility-scale solar power plant was built in 1982 in

cost per watt as well as its energy payback time, and reached grid parity.[66] As a result, PV adoption has grown exponentially since 2010.[67] Global capacity increased from 230 GW at the end of 2015 to 890 GW in 2021.[68] PV grew fastest in China between 2016 and 2021, adding 560 GW, more than all advanced economies combined.[69] Four of the ten biggest solar power stations are in China, including the biggest, Golmud Solar Park in China.[70] Many utility-scale PV systems use tracking systems that follow the sun's daily path across the sky to generate more electricity than fixed-mounted systems.[71]

Solar thermal

This section is an excerpt from Solar thermal energy.[edit]
Roof-mounted close-coupled thermosiphon solar water heater.

industry
, and in the residential and commercial sectors.

Solar thermal collectors are classified by the United States Energy Information Administration as low-, medium-, or high-temperature collectors. Low-temperature collectors are generally unglazed and used to heat swimming pools or to heat ventilation air. Medium-temperature collectors are also usually flat plates but are used for heating water or air for residential and commercial use.

High-temperature collectors concentrate sunlight using
lenses
and are generally used for fulfilling heat requirements up to 300 deg C / 20 bar pressure in industries, and for electric power production. Two categories include Concentrated Solar Thermal (CST) for fulfilling heat requirements in industries, and Concentrated Solar Power (CSP) when the heat collected is used for electric power generation. CST and CSP are not replaceable in terms of application.

Wind power

Main articles: Wind power and Wind power by country
Burbo, NW-England
Sunrise at the Fenton Wind Farm in Minnesota, United States
Wind energy generation by region over time[72]
Global electricity power generation capacity 1017.2 GW (2023)[73]
Global electricity power generation capacity annual growth rate 13% (2014-2023)[74]
Share of global electricity generation 7.6% (2022)[49]
Levelized cost per megawatt hour Land-based wind: USD 30.165 (2019)[75]
Primary technology Wind turbine
Other energy applications Windmill, windpump

Humans have harnessed wind energy since at least 3500 BC. Until the 20th century, it was primarily used to power ships, windmills and water pumps. Today, the vast majority of wind power is used to generate electricity using wind turbines.[37] Modern utility-scale wind turbines range from around 600 kW to 9 MW of rated power. The power available from the wind is a function of the cube of the wind speed, so as wind speed increases, power output increases up to the maximum output for the particular turbine.[76] Areas where winds are stronger and more constant, such as offshore and high-altitude sites, are preferred locations for wind farms.

Wind-generated electricity met nearly 4% of global electricity demand in 2015, with nearly 63 GW of new wind power capacity installed. Wind energy was the leading source of new capacity in Europe, the US and Canada, and the second largest in China. In Denmark, wind energy met more than 40% of its electricity demand while Ireland, Portugal and Spain each met nearly 20%.[77]

Globally, the long-term technical potential of wind energy is believed to be five times total current global energy production, or 40 times current electricity demand, assuming all practical barriers needed were overcome. This would require wind turbines to be installed over large areas, particularly in areas of higher wind resources, such as offshore, and likely also industrial use of new types of VAWT turbines in addition to the horizontal axis units currently in use. As offshore wind speeds average ~90% greater than that of land, offshore resources can contribute substantially more energy than land-stationed turbines.[78]

Hydropower

Main articles: Hydroelectricity and Hydropower
Yangtze River
in China
Three Gorges Dam and Gezhouba Dam, China
Global electricity power generation capacity 1,267.9 GW (2023)[79]
Global electricity power generation capacity annual growth rate 1.9% (2014-2023)[80]
Share of global electricity generation 15% (2022)[49]
Levelized cost per megawatt hour USD 65.581 (2019)[81]
Primary technology Dam
Other energy applications Pumped storage, mechanical power

Since water is about 800 times denser than air, even a slow flowing stream of water, or moderate sea swell, can yield considerable amounts of energy. Water can generate electricity with a conversion efficiency of about 90%, which is the highest rate in renewable energy.[82] There are many forms of water energy:

  • Historically, hydroelectric power came from constructing large hydroelectric dams and reservoirs, which are still popular in developing countries.[83] The largest of them are the Three Gorges Dam (2003) in China and the Itaipu Dam (1984) built by Brazil and Paraguay.
  • Small hydro systems are hydroelectric power installations that typically produce up to 50 MW of power. They are often used on small rivers or as a low-impact development on larger rivers. China is the largest producer of hydroelectricity in the world and has more than 45,000 small hydro installations.[84]
  • Run-of-the-river hydroelectricity plants derive energy from rivers without the creation of a large reservoir. The water is typically conveyed along the side of the river valley (using channels, pipes and/or tunnels) until it is high above the valley floor, whereupon it can be allowed to fall through a penstock to drive a turbine. A run-of-river plant may still produce a large amount of electricity, such as the Chief Joseph Dam on the Columbia River in the United States.[85] However many run-of-the-river hydro power plants are micro hydro or pico hydro plants.

Hydropower is produced in 150 countries, with the Asia-Pacific region generating 32 percent of global hydropower in 2010.[

MW
) worldwide, see table below.

Rank Station Country Location Capacity (
MW
)
1. Three Gorges Dam  China 30°49′15″N 111°00′08″E / 30.82083°N 111.00222°E / 30.82083; 111.00222 (Three Gorges Dam) 22,500
2. Baihetan Dam  China 27°13′23″N 102°54′11″E / 27.22306°N 102.90306°E / 27.22306; 102.90306 (Three Gorges Dam) 16,000
3. Itaipu Dam  Brazil
 Paraguay		 25°24′31″S 54°35′21″W / 25.40861°S 54.58917°W / -25.40861; -54.58917 (Itaipu Dam) 14,000
4. Xiluodu Dam  China 28°15′35″N 103°38′58″E / 28.25972°N 103.64944°E / 28.25972; 103.64944 (Xiluodu Dam) 13,860
5. Belo Monte Dam  Brazil 03°06′57″S 51°47′45″W / 3.11583°S 51.79583°W / -3.11583; -51.79583 (Belo Monte Dam) 11,233
6. Guri Dam  Venezuela 07°45′59″N 62°59′57″W / 7.76639°N 62.99917°W / 7.76639; -62.99917 (Guri Dam) 10,235
7. Wudongde Dam  China 26°20′2″N 102°37′48″E / 26.33389°N 102.63000°E / 26.33389; 102.63000 (Three Gorges Dam) 10,200

Much hydropower is flexible, thus complementing wind and solar.[87] In 2021, the world renewable hydropower capacity was 1,360 GW.[69] Only a third of the world's estimated hydroelectric potential of 14,000 TWh/year has been developed.[88][89] New hydropower projects face opposition from local communities due to their large impact, including relocation of communities and flooding of wildlife habitats and farming land.[90] High cost and lead times from permission process, including environmental and risk assessments, with lack of environmental and social acceptance are therefore the primary challenges for new developments.[91] It is popular to repower old dams thereby increasing their efficiency and capacity as well as quicker responsiveness on the grid.[92] Where circumstances permit existing dams such as the Russell Dam built in 1985 may be updated with "pump back" facilities for pumped-storage which is useful for peak loads or to support intermittent wind and solar power. Because dispatchable power is more valuable than VRE[93][94] countries with large hydroelectric developments such as Canada and Norway are spending billions to expand their grids to trade with neighboring countries having limited hydro.[95]

Bioenergy

Main article: Bioenergy
Stump harvesting increases recovery of biomass from forests
Further information: Biomass (energy) § Environmental impacts
Sugarcane plantation to produce ethanol in Brazil
A CHP power station using wood to supply 30,000 households in France
Global electricity power generation capacity 150.3 GW (2023)[96]
Global electricity power generation capacity annual growth rate 5.8% (2014-2023)[97]
Share of global electricity generation 2.4% (2022)[49]
Levelized cost per megawatt hour USD 118.908 (2019)[98]
Primary technologies biomass, biofuel
Other energy applications Heating, cooking, transportation fuels

oil palm (palm oil
).

Plant energy is produced by crops specifically grown for use as fuel that offer high biomass output per hectare with low input energy.[101] The grain can be used for liquid transportation fuels while the straw can be burned to produce heat or electricity. Plant biomass can also be degraded from cellulose to glucose through a series of chemical treatments, and the resulting sugar can then be used as a first-generation biofuel.

Biomass can be converted to other usable forms of energy such as

algal fuel or algae-derived biomass due to the fact that it is a non-food resource, grows around 20 times faster than other types of food crops, such as corn and soy, and can be grown almost anywhere.[104][105] Once harvested, it can be fermented to produce biofuels such as ethanol, butanol, and methane, as well as biodiesel and hydrogen. The biomass used for electricity generation varies by region. Forest by-products, such as wood residues, are common in the United States. Agricultural waste is common in Mauritius (sugar cane residue) and Southeast Asia
(rice husks).

Biomass, biogas and biofuels are burned to produce heat/power and in doing so can harm the environment. Pollutants such as sulphurous oxides (SOx), nitrous oxides (NOx), and particulate matter (PM) are produced from the combustion of biomass. With regards to traditional use of biomass for heating and cooking, the World Health Organization estimates that 3.7 million prematurely died from outdoor air pollution in 2012 while indoor pollution from biomass burning effects over 3 billion people worldwide.[106][107]

Bioenergy global capacity in 2021 was 158 GW. Biofuels avoided 4.4% of global transport fuel demand in 2021.[69]

Biofuel

Main article: Biofuel
See also: Ethanol fuel, Sustainable biofuel, and Issues relating to biofuels
Brazil produces bioethanol made from sugarcane available throughout the country. A typical gas station with dual fuel service is marked "A" for alcohol (ethanol) and "G" for gasoline.
A bus fueled by biodiesel

Bioethanol is an alcohol made by fermenting the sugar components of plant materials and it is made mostly from sugar and starch crops. These include maize, sugarcane and, more recently, sweet sorghum. The latter crop is particularly suitable for growing in dryland conditions, and is being investigated by International Crops Research Institute for the Semi-Arid Tropics for its potential to provide fuel, along with food and animal feed, in arid parts of Asia and Africa.[109]

With advanced technology being developed, cellulosic biomass, such as trees and grasses, are also used as feedstocks for ethanol production. Ethanol can be used as a fuel for vehicles in its pure form, but it is usually used as a gasoline additive to increase octane and improve vehicle emissions. Bioethanol is widely used in the United States and in Brazil. The energy costs for producing bio-ethanol are almost equal to, the energy yields from bio-ethanol. However, according to the European Environment Agency, biofuels do not address global warming concerns.[110] Biodiesel is made from vegetable oils, animal fats or recycled greases. It can be used as a fuel for vehicles in its pure form, or more commonly as a diesel additive to reduce levels of particulates, carbon monoxide, and hydrocarbons from diesel-powered vehicles. Biodiesel is produced from oils or fats using transesterification and is the most common biofuel in Europe. Biofuels provided 2.7% of the world's transport fuel in 2010.[111][needs update]

Policies in more than 80 countries support biofuels demand.[69]

Since the 1970s, Brazil has had an ethanol fuel program which has allowed the country to become the world's second largest producer of ethanol (after the United States) and the world's largest exporter.[112] Brazil's ethanol fuel program uses modern equipment and cheap sugarcane as feedstock, and the residual cane-waste (bagasse) is used to produce heat and power.[113] There are no longer light vehicles in Brazil running on pure gasoline.[114]

Biojet is expected to be important for short-term reduction of carbon dioxide emissions from long-haul flights.[115]

Geothermal energy

Main articles: Geothermal energy, Geothermal power, Renewable thermal energy, and Geothermal energy in the United States
Steam rising from the Nesjavellir Geothermal Power Station in Iceland
Geothermal plant at The Geysers, California, US
geothermal power station
in Iceland
Global electricity power generation capacity 14.9 GW (2023)[116]
Global electricity power generation capacity annual growth rate 3.4% (2014-2023)[117]
Share of global electricity generation <1% (2018)[118]
Levelized cost per megawatt hour USD 58.257 (2019)[119]
Primary technologies Dry steam, flash steam, and binary cycle power stations
Other energy applications Heating

High temperature geothermal energy is from thermal energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter. Earth's geothermal energy originates from the original formation of the planet and from radioactive decay of minerals (in currently uncertain[120] but possibly roughly equal[121] proportions). The geothermal gradient, which is the difference in temperature between the core of the planet and its surface, drives a continuous conduction of thermal energy in the form of heat from the core to the surface. The adjective geothermal originates from the Greek roots geo, meaning earth, and thermos, meaning heat.

The heat used for geothermal energy can be from deep within the Earth, all the way down to Earth's core – 6,400 kilometres (4,000 mi) down. At the core, temperatures may reach over 5,000 °C (9,030 °F). Heat conducts from the core to the surrounding rock. Extremely high temperature and pressure cause some rock to melt, which is commonly known as magma. Magma convects upward since it is lighter than the solid rock. This magma then heats rock and water in the crust, sometimes up to 371 °C (700 °F).[122]

Low temperature geothermal

geothermal heat pump and ground-coupled heat exchanger are used together to move heat energy into the Earth (for cooling) and out of the Earth (for heating) on a varying seasonal basis. Low-temperature geothermal (generally referred to as "GHP"[clarification needed]) is an increasingly important renewable technology because it both reduces total annual energy loads associated with heating and cooling, and it also flattens the electric demand curve eliminating the extreme summer and winter peak electric supply requirements. Thus low temperature geothermal/GHP is becoming an increasing national[clarification needed] priority with multiple tax credit support[124] and focus as part of the ongoing movement toward net zero energy.[125]

Geothermal power is cost effective, reliable, sustainable, and environmentally friendly,[126] but has historically been limited to areas near tectonic plate boundaries. Recent technological advances have expanded the range and size of viable resources, especially for applications such as home heating, opening a potential for widespread exploitation. Geothermal wells release greenhouse gases trapped deep within the earth, but these emissions are usually much lower per energy unit than those of fossil fuels.

In 2017, the United States led the world in

geothermal electricity production with 12.9 GW of installed capacity.[68] The largest group of geothermal power plants in the world is located at The Geysers, a geothermal field in California.[127] The Philippines follows the US as the second highest producer of geothermal power in the world, with 1.9 GW of capacity online.[68]

Global geothermal capacity in 2021 was 15 GW.[69]

Emerging technologies

There are also other renewable energy technologies that are still under development, including

hot-dry-rock geothermal power, and marine energy.[128][129] These technologies are not yet widely demonstrated or have limited commercialization. Many are on the horizon and may have potential comparable to other renewable energy technologies, but still depend on attracting sufficient attention and research, development and demonstration (RD&D) funding.[129]

There are numerous organizations within the academic, federal,[clarification needed] and commercial sectors conducting large-scale advanced research in the field of renewable energy. This research spans several areas of focus across the renewable energy spectrum. Most of the research is targeted at improving efficiency and increasing overall energy yields.[130] Multiple government-supported research organizations have focused on renewable energy in recent years. Two of the most prominent of these labs are Sandia National Laboratories and the National Renewable Energy Laboratory (NREL), both of which are funded by the United States Department of Energy and supported by various corporate partners.[131]

Enhanced geothermal system

Enhanced geothermal system (see file description for details)
Main article:
Enhanced geothermal systems

Enhanced geothermal systems (EGS) are a new type of geothermal power technology that does not require natural convective hydrothermal resources. The vast majority of geothermal energy within drilling reach is in dry and non-porous rock.

hydraulic fracturing. EGS and HDR technologies, such as hydrothermal geothermal, are expected to be baseload resources that produce power 24 hours a day like a fossil plant. Distinct from hydrothermal, HDR and EGS may be feasible anywhere in the world, depending on the economic limits of drill depth. Good locations are over deep granite covered by a thick (3–5 km or 1.9–3.1 mi) layer of insulating sediments which slow heat loss.[133]
There are HDR and EGS systems currently being developed and tested in France, Australia, Japan, Germany, the U.S., and Switzerland. The largest EGS project in the world is a 25 megawatt demonstration plant currently being developed in the Cooper Basin, Australia. The Cooper Basin has the potential to generate 5,000–10,000 MW.

Hydrogen

See also:
White hydrogen, Hydrogen economy, and Hydrogen fuel cell power plant

Marine energy

Rance Tidal Power Station, France
Main article: Marine energy

Marine energy (also sometimes referred to as ocean energy) is the energy carried by

Reverse electrodialysis (RED) is a technology for generating electricity by mixing fresh river water and salty sea water in large power cells designed for this purpose; as of 2016, it is being tested at a small scale (50 kW). Offshore wind power is not a form of marine energy, as wind power is derived from the wind, even if the wind turbines are placed over water. The oceans have a tremendous amount of energy and are close to many if not most concentrated populations. Ocean energy has the potential of providing a substantial amount of new renewable energy around the world.[134][135][page needed
]

# Station Country Location Capacity Refs
1. Sihwa Lake Tidal Power Station South Korea 37°18′47″N 126°36′46″E / 37.31306°N 126.61278°E / 37.31306; 126.61278 (Sihwa Lake Tidal Power Station) 254 MW [136]
2. Rance Tidal Power Station France 48°37′05″N 02°01′24″W / 48.61806°N 2.02333°W / 48.61806; -2.02333 (Rance Tidal Power Station) 240 MW [137]
3. Annapolis Royal Generating Station Canada 44°45′07″N 65°30′40″W / 44.75194°N 65.51111°W / 44.75194; -65.51111 (Annapolis Royal Generating Station) 20 MW [137]
Passive daytime radiative cooling can cool temperatures with zero energy consumption or pollution.[138]

Passive daytime radiative cooling

Main article: Passive daytime radiative cooling

global warming.[138][149] PDRC applications are deployed as sky-facing surfaces, similar to other renewable energy sources such as photovoltaic systems and solar thermal collectors.[147] PDRC became possible with the ability to suppress solar heating using photonic metamaterials, first published in a study by Raman et al. to the scientific community in 2014.[146][150] PDRC applications for indoor space cooling is growing with an estimated "market size of ~$27 billion in 2025."[151]

Earth infrared thermal radiation

Earth emits roughly 1017 W of infrared thermal radiation that flows toward the cold outer space. Solar energy hits the surface and atmosphere of the earth and produces heat. Using various theorized devices like emissive energy harvester (EEH) or thermoradiative diode, this energy flow can be converted into electricity. In theory, this technology can be used during nighttime.[152][153]

Others

Algae fuels

Main article:
Algae fuels

Producing liquid fuels from oil-rich (fat-rich) varieties of algae is an ongoing research topic. Various microalgae grown in open or closed systems are being tried including some systems that can be set up in brownfield and desert lands.[154]

Water vapor

Collection of static electricity charges from water droplets on metal surfaces is an experimental technology that would be especially useful in low-income countries with relative air humidity over 60%.[155]

Nuclear energy

seawater uranium extraction (currently too expensive to be economical), there is enough fuel for breeder reactors to satisfy the world's energy needs for 5 billion years at 1983's total energy consumption rate, thus making nuclear energy effectively a renewable energy.[157][158] In addition to seawater the average crustal granite rocks contain significant quantities of uranium and thorium that with breeder reactors can supply abundant energy for the remaining lifespan of the sun on the main sequence of stellar evolution.[159]

Artificial photosynthesis

Main article: Artificial photosynthesis

Artificial photosynthesis uses techniques including nanotechnology to store solar electromagnetic energy in chemical bonds by splitting water to produce hydrogen and then using carbon dioxide to make methanol.[160] Researchers in this field strived to design molecular mimics of photosynthesis that use a wider region of the solar spectrum, employ catalytic systems made from abundant, inexpensive materials that are robust, readily repaired, non-toxic, stable in a variety of environmental conditions and perform more efficiently allowing a greater proportion of photon energy to end up in the storage compounds, i.e., carbohydrates (rather than building and sustaining living cells).[161] However, prominent research faces hurdles, Sun Catalytix a MIT spin-off stopped scaling up their prototype fuel-cell in 2012 because it offers few savings over other ways to make hydrogen from sunlight.[162]

Consumption by sector

One of the efforts to decarbonize transportation is the increased use of

electrofuels may also play a greater role in decarbonizing hard-to-abate sectors like aviation and maritime shipping.[166]

Solar water heating makes an important contribution to renewable heat in many countries, most notably in China, which now has 70% of the global total (180 GWth). Most of these systems are installed on multi-family apartment buildings[167] and meet a portion of the hot water needs of an estimated 50–60 million households in China. Worldwide, total installed solar water heating systems meet a portion of the water heating needs of over 70 million households.

Heat pumps provide both heating and cooling, and also flatten the electric demand curve and are thus an increasing priority.[123] Renewable thermal energy is also growing rapidly.[168] About 10% of heating and cooling energy is from renewables.[169]

Integration into the energy system and sector coupling

Main article: Variable renewable energy
baseload generation in the grid[clarification needed
]

Renewable energy production from some sources such as wind and solar is more variable and more geographically spread than technology based on fossil fuels and nuclear. While integrating it into the wider energy system is feasible, it does lead to some additional challenges such as increased production volatility and decreased system inertia.[170] Implementation of energy storage, using a wide variety of renewable energy technologies, and implementing a smart grid in which energy is automatically used at the moment it is produced can reduce risks and costs of renewable energy implementation.[170][171]: 15–16 

Sector coupling of the power generation sector with other sectors may increase flexibility: for example the transport sector can be coupled by charging electric vehicles and sending electricity from vehicle to grid.[172] Similarly the industry sector can be coupled by hydrogen produced by electrolysis,[173] and the buildings sector by thermal energy storage for space heating and cooling.[174]

Electrical energy storage

Main articles: Energy storage and Grid energy storage

Electrical energy storage is a collection of methods used to store electrical energy. Electrical energy is stored during times when production (especially from intermittent sources such as

ancillary services[177] and for domestic storage.[178] Green hydrogen is a more economical means of long-term renewable energy storage, in terms of capital expenditures compared to pumped hydroelectric or batteries.[179][180]

Further information: Self-powered dynamic systems

Market and industry trends

Main article: Renewable energy commercialization

Most new renewables are solar, followed by wind then hydro then bioenergy.[181] Investment in renewables, especially solar, tends to be more effective in creating jobs than coal, gas or oil.[182][183] Worldwide, renewables employ about 12 million people as of 2020, with solar PV being the technology employing the most at almost 4 million.[184] However, as of February 2024, the world's supply of workforce for solar energy is lagging greatly behind demand as universities worldwide still produce more workforce for fossil fuels than for renewable energy industries.[185]

Cost comparison

The International Renewable Energy Agency (IRENA) stated that ~86% (187 GW) of renewable capacity added in 2022 had lower costs than electricity generated from fossil fuels.[186] IRENA also stated that capacity added since 2000 reduced electricity bills in 2022 by at least $520 billion, and that in non-OECD countries, the lifetime savings of 2022 capacity additions will reduce costs by up to $580 billion.[186]

Installed[187]
TWp 		Growth
TW/yr[187] 		Production
per installed
capacity*[188] 		Energy
TWh/yr*[188] 		Growth
TWh/yr*[188]
Levelized cost
US¢/kWh[189]
 Av. auction prices
US¢/kWh[190] 		Cost development
2010–2019[189]
Solar PV 0.580 0.098 13% 549 123 6.8 3.9 −82%
Solar CSP 0.006 0.0006 13% 6.3 0.5 18.2 7.5 −47%
Wind Offshore 0.028 0.0045 33% 68 11.5 11.5 8.2 −30%
Wind Onshore 0.594 0.05 25% 1194 118 5.3 4.3 −38%
Hydro 1.310 0.013 38% 4267 90 4.7 +27%
Bioenergy 0.12 0.006 51% 522 27 6.6 −13%
Geothermal 0.014 0.00007 74% 13.9 0.7 7.3 +49%

* = 2018. All other values for 2019.

Growth of renewables

Investment and sources
Investment: Companies, governments and households have committed increasing amounts to decarbonization, including renewable energy (solar, wind), electric vehicles and associated charging infrastructure, energy storage, energy-efficient heating systems, carbon capture and storage, and hydrogen.[191][192]
Clean energy investment has benefited from post-pandemic economic recovery, a global energy crisis involving high fossil fuel prices, and growing policy support across various nations.[193]
The countries most reliant on fossil fuels for electricity vary widely on how great a portion of that electricity is generated from renewables, leaving wide variation in renewables' growth potential.[194]
Costs
Levelized cost: With increasingly widespread implementation of renewable energy sources, costs have declined, most notably for energy generated by solar panels.[195][196]
learning curves and economies of scale.[200]

The results of a recent review of the literature concluded that as greenhouse gas (GHG) emitters begin to be held liable for damages resulting from GHG emissions resulting in climate change, a high value for liability mitigation would provide powerful incentives for deployment of renewable energy technologies.[201]

In the decade of 2010–2019, worldwide investment in renewable energy capacity excluding large hydropower amounted to US$2.7 trillion, of which the top countries China contributed US$818 billion, the United States contributed US$392.3 billion, Japan contributed US$210.9 billion, Germany contributed US$183.4 billion, and the United Kingdom contributed US$126.5 billion.[202] This was an increase of over three and possibly four times the equivalent amount invested in the decade of 2000–2009 (no data is available for 2000–2003).[202]

As of 2022, an estimated 28% of the world's electricity was generated by renewables. This is up from 19% in 1990.[203]

Future projections

See also: Energy transition
In 2023, electricity generation from wind and solar sources was projected to exceed 30% by 2030.[204]

A December 2022 report by the IEA forecasts that over 2022-2027, renewables are seen growing by almost 2 400 GW in its main forecast, equal to the entire installed power capacity of China in 2021. This is an 85% acceleration from the previous five years, and almost 30% higher than what the IEA forecast in its 2021 report, making its largest ever upward revision. Renewables are set to account for over 90% of global electricity capacity expansion over the forecast period.[69] To achieve net zero emissions by 2050, IEA believes that 90% of global electricity generation will need to be produced from renewable sources.[24]

In June 2022 IEA Executive Director Fatih Birol said that countries should invest more in renewables to "ease the pressure on consumers from high fossil fuel prices, make our energy systems more secure, and get the world on track to reach our climate goals.”[205]

China's five year plan to 2025 includes increasing direct heating by renewables such as geothermal and solar thermal.[206]

REPowerEU, the EU plan to escape dependence on fossil Russian gas, is expected to call for much more green hydrogen.[207]

After a transitional period,

DNV GL, forecasts that the world's primary energy mix will be split equally between fossil and non-fossil sources by 2050.[209]

Demand

In July 2014, WWF and the World Resources Institute convened a discussion among a number of major US companies who had declared their intention to increase their use of renewable energy. These discussions identified a number of "principles" which companies seeking greater access to renewable energy considered important market deliverables. These principles included choice (between suppliers and between products), cost competitiveness, longer term fixed price supplies, access to third-party financing vehicles, and collaboration.[210]

UK statistics released in September 2020 noted that "the proportion of demand met from renewables varies from a low of 3.4 per cent (for transport, mainly from biofuels) to highs of over 20 per cent for 'other final users', which is largely the service and commercial sectors that consume relatively large quantities of electricity, and industry".[211]

In some locations, individual households can opt to purchase renewable energy through a consumer green energy program.

Developing countries

This section is an excerpt from Renewable energy in developing countries.[edit]
Shop selling PV panels in Ouagadougou, Burkina Faso
Solar cookers use sunlight as energy source for outdoor cooking.

developing countries than in developed countries, and comprised 54% of global renewable energy investment in 2019.[213] The International Energy Agency forecasts that renewable energy will provide the majority of energy supply growth through 2030 in Africa and Central and South America, and 42% of supply growth in China.[214]

Most developing countries have abundant renewable energy resources, including solar energy, wind power, geothermal energy, and biomass, as well as the ability to manufacture the relatively labor-intensive systems that harness these. By developing such energy sources developing countries can reduce their dependence on oil and natural gas, creating energy portfolios that are less vulnerable to price rises. In many circumstances, these investments can be less expensive than fossil fuel energy systems.[215]

In Kenya, the Olkaria V Geothermal Power Station is one of the largest in the world.[216] The Grand Ethiopia Renaissance Dam project incorporates wind turbines.[217] Once completed, Morocco's Ouarzazate Solar Power Station is projected to provide power to over a million people.[218]

Policy

Share of electricity production from renewables, 2022[45]

Policies to support renewable energy have been vital in their expansion. Where Europe dominated in establishing energy policy in the early 2000s, most countries around the world now have some form of energy policy.[219]

Policy trends

The

intergovernmental organization for promoting the adoption of renewable energy worldwide. It aims to provide concrete policy advice and facilitate capacity building and technology transfer. IRENA was formed in 2009, with 75 countries signing the charter of IRENA.[220] As of April 2019, IRENA has 160 member states.[221] The then United Nations Secretary-General Ban Ki-moon has said that renewable energy can lift the poorest nations to new levels of prosperity,[222] and in September 2011 he launched the UN Sustainable Energy for All initiative to improve energy access, efficiency and the deployment of renewable energy.[223]

The 2015 Paris Agreement on climate change motivated many countries to develop or improve renewable energy policies.[23] In 2017, a total of 121 countries adopted some form of renewable energy policy.[219] National targets that year existed in 176 countries.[23] In addition, there is also a wide range of policies at the state/provincial, and local levels.[111] Some public utilities help plan or install residential energy upgrades.

Many national, state and local governments have created

green banks. A green bank is a quasi-public financial institution that uses public capital to leverage private investment in clean energy technologies.[224]
Green banks use a variety of financial tools to bridge market gaps that hinder the deployment of clean energy.

Climate neutrality by the year 2050 is the main goal of the European Green Deal.[225] For the European Union to reach their target of climate neutrality, one goal is to decarbonise its energy system by aiming to achieve "net-zero greenhouse gas emissions by 2050."[226]

Full renewable energy

These paragraphs are an excerpt from 100% renewable energy.[edit]

a transition of the energy system, since most of today's energy is derived from non-renewable fossil fuels
.

Research into this topic is fairly new, with very few studies published before 2009, but has gained increasing attention in recent years. The majority of studies show that a global transition to 100% renewable energy across all sectors – power, heat, transport and industry – is feasible and economically viable.[227][228][229][230][need quotation to verify] A cross-sectoral, holistic approach is seen as an important feature of 100% renewable energy systems and is based on the assumption "that the best solutions can be found only if one focuses on the synergies between the sectors" of the energy system such as electricity, heat, transport or industry.[231]

The main barriers to the widespread implementation of large-scale renewable energy and low-carbon energy strategies are seen to be primarily social and political rather than technological or economic.
energy infrastructure, and financial constraints.[233]

Finance

The International Renewable Energy Agency's (IRENA) 2023 report on renewable energy finance highlights steady investment growth since 2018: USD 348 billion in 2020 (a 5.6% increase from 2019), USD 430 billion in 2021 (24% up from 2020), and USD 499 billion in 2022 (16% higher). This trend is driven by increasing recognition of renewable energy's role in mitigating climate change and enhancing energy security, along with investor interest in alternatives to fossil fuels. Policies such as feed-in tariffs in China and Vietnam have significantly increased renewable adoption. Furthermore, from 2013 to 2022, installation costs for solar photovoltaic (PV), onshore wind, and offshore wind fell by 69%, 33%, and 45%, respectively, making renewables more cost-effective.[234][235]

Solar

From 2020 to 2022, solar technology investments almost doubled from USD 162 billion to USD 308 billion, driven by the sector's increasing maturity and cost reductions, particularly in solar photovoltaic (PV), which accounted for 90% of total investments. China and the United States were the main recipients, collectively making up about half of all solar investments since 2013. Despite reductions in Japan and India due to policy changes and COVID-19, growth in China, the United States, and a significant increase from Vietnam's feed-in tariff program offset these declines. Globally, the solar sector added 714 gigawatts (GW) of solar PV and concentrated solar power (CSP) capacity between 2013 and 2021, with a notable rise in large-scale solar heating installations in 2021, especially in China, Europe, Turkey, and Mexico.[235]

Wind

Investments in wind technologies reached USD 161 billion in 2020, with onshore wind dominating at 80% of total investments from 2013 to 2022. Offshore wind investments nearly doubled to USD 41 billion between 2019 and 2020, primarily due to policy incentives in China and expansion in Europe. Global wind capacity increased by 557 GW between 2013 and 2021, with capacity additions increasing by an average of 19% each year.[235]

Other renewable energy

Between 2013 and 2022, the renewable energy sector underwent a significant realignment of investment priorities. Investment in solar and wind energy technologies markedly increased. In contrast, other renewable technologies such as hydropower (including

pumped storage hydropower), biomass, biofuels, geothermal, and marine energy experienced a substantial decrease in financial investment. Notably, from 2017 to 2022, investment in these alternative renewable technologies declined by 45%, falling from USD 35 billion to USD 17 billion.[235]

Debates

Main articles:
Intermittent power source
Further information: Climate change mitigation § Overviews, strategies and comparisons of measures
Most respondents to a climate survey conducted in 2021-2022 by the European Investment Bank say countries should back renewable energy to fight climate change.[236]
The same survey a year later shows that renewable energy is considered an investment priority in the European Union, China and the United States[237]

Renewable electricity generation by wind and solar is

base load power from non-intermittent sources like hydropower, nuclear power
or bioenergy.

The market for renewable energy technologies has continued to grow.

better source needed
]

The International Energy Agency has stated that deployment of renewable technologies usually increases the diversity of electricity sources and, through local generation, contributes to the flexibility of the system and its resistance to central shocks.[241]

Public support

Acceptance of wind and solar facilities in one's community is stronger among U.S. Democrats (blue), while acceptance of nuclear power plants is stronger among U.S. Republicans (red).[242]

Solar power plants may compete with arable land,[243][244] while on-shore wind farms face opposition due to aesthetic concerns and noise, which is impacting both humans and wildlife.[245][246][247][need quotation to verify]In the United States, the Massachusetts Cape Wind project was delayed for years partly because of aesthetic concerns. However, residents in other areas have been more positive. According to a town councilor, the overwhelming majority of locals believe that the Ardrossan Wind Farm in Scotland has enhanced the area.[248] These concerns, when directed against renewable energy, are sometimes described as "not in my back yard" attitude (NIMBY).

A 2011 UK Government document states that "projects are generally more likely to succeed if they have broad public support and the consent of local communities. This means giving communities both a say and a stake".[249] In countries such as Germany and Denmark many renewable projects are owned by communities, particularly through cooperative structures, and contribute significantly to overall levels of renewable energy deployment.[250][251]

Nuclear power proposed as renewable energy

The Leibstadt Nuclear Power Plant in Switzerland
This section is an excerpt from Nuclear power proposed as renewable energy.[edit]

Whether

energy technologies often omit or explicitly exclude mention of nuclear energy sources, with an exception made for the natural nuclear decay heat generated within the Earth.[253][254]

The most common fuel used in conventional

nuclear fission power stations, uranium-235 is "non-renewable" according to the Energy Information Administration, the organization however is silent on the recycled MOX fuel.[254] The National Renewable Energy Laboratory does not mention nuclear power in its "energy basics" definition.[255]

In 1987, the
radioactive waste products is also required upon the use of other renewable energy sources, such as geothermal energy.[257]

Geopolitics

See also: Russia in the European energy sector
A concept of a super grid

The geopolitical impact of the growing use of renewable energy is a subject of ongoing debate and research.[258] Many fossil-fuel producing countries, such as Qatar, Russia, Saudi Arabia and Norway, are currently able to exert diplomatic or geopolitical influence as a result of their oil wealth. Most of these countries are expected to be among the geopolitical "losers" of the energy transition, although some, like Norway, are also significant producers and exporters of renewable energy. Fossil fuels and the infrastructure to extract them may, in the long term, become stranded assets.[259] It has been speculated that countries dependent on fossil fuel revenue may one day find it in their interests to quickly sell off their remaining fossil fuels.[260]

Conversely, nations abundant in renewable resources, and the minerals required for renewables technology, are expected to gain influence.[261][262] In particular, China has become the world's dominant manufacturer of the technology needed to produce or store renewable energy, especially solar panels, wind turbines, and lithium-ion batteries.[263] Nations rich in solar and wind energy could become major energy exporters.[264] Some may produce and export green hydrogen,[265][264] although electricity is projected to be the dominant energy carrier in 2050, accounting for almost 50% of total energy consumption (up from 22% in 2015).[266] Countries with large uninhabited areas such as Australia, China, and many African and Middle Eastern countries have a potential for huge installations of renewable energy. The production of renewable energy technologies requires rare-earth elements with new supply chains.[267]

Countries with already weak governments that rely on fossil fuel revenue may face even higher political instability or popular unrest. Analysts consider Nigeria, Angola, Chad, Gabon, and Sudan, all countries with a history of military coups, to be at risk of instability due to dwindling oil income.[268]

A study found that transition from fossil fuels to renewable energy systems reduces risks from mining, trade and political dependence because renewable energy systems don't need fuel – they depend on trade only for the acquisition of materials and components during construction.[269]

In October 2021, European Commissioner for Climate Action

2021 global energy crisis is "to reduce our reliance on fossil fuels."[270] He said those blaming the European Green Deal were doing so "for perhaps ideological reasons or sometimes economic reasons in protecting their vested interests."[270] Some critics blamed the European Union Emissions Trading System (EU ETS) and closure of nuclear plants for contributing to the energy crisis.[271][272][273] European Commission President Ursula von der Leyen said that Europe is "too reliant" on natural gas and too dependent on natural gas imports. According to Von der Leyen, "The answer has to do with diversifying our suppliers ... and, crucially, with speeding up the transition to clean energy."[274]

Metal and mineral extraction

The renewable energy transition requires increased extraction of certain metals and minerals.[275] Solar power panels require large amounts of aluminum.[276] This impacts the environment and can lead to environmental conflict.[277]

The International Energy Agency does not recognise shortages of resources but states that supply could struggle to keep pace with the world's climate ambitions. Electric vehicles (EV) and battery storage are expected to cause the most demand. Wind farms and solar PV are less consuming. The extension of electrical grids requires large amounts of copper and aluminium. The IEA recommends to scale up recycling. By 2040, quantities of copper, lithium, cobalt, and nickel from spent batteries could reduce combined primary supply requirements for these minerals by around 10%.[275]

The demand for lithium by 2040 is expected to grow by the factor of 42. Graphite and nickel exploration is predicted to grow about 20-fold. For each of the most relevant minerals and metals, a significant share of resources are concentrated in only one country:

cobalt in the Democratic Republic of the Congo (DRC), and lithium in Australia. China dominates processing of them all.[275]

A controversial approach is

polymetallic nodules lying on the seabed,[278] but this could damage biodiversity.[279]

Health and environmental impact

Further information: Rare-earth element § Environmental considerations

Moving to modern renewable energy has very large health benefits due to reducing air pollution from fossil fuels.[280][281][282][283][284][285]

Renewable sources other than biomass such as wind power, photovoltaics, and hydroelectricity have the advantage of being able to conserve water, lower pollution[286] and reduce CO2 emissions.

Solar panels change the albedo of the surface, so if used on a very large scale (such as covering 20% of the Sahara Desert), could change global weather patterns.[287]

Conservation areas, recycling and rare-earth elements

See also:
Environmental footprint of electric cars

Installations used to produce wind, solar and hydropower are an increasing threat to key conservation areas, with facilities built in areas set aside for nature conservation and other environmentally sensitive areas. They are often much larger than fossil fuel power plants, needing areas of land up to 10 times greater than coal or gas to produce equivalent energy amounts.[288] More than 2000 renewable energy facilities are built, and more are under construction, in areas of environmental importance and threaten the habitats of plant and animal species across the globe. The authors' team emphasized that their work should not be interpreted as anti-renewables because renewable energy is crucial for reducing carbon emissions. The key is ensuring that renewable energy facilities are built in places where they do not damage biodiversity.[289]

The transition to renewable energy depends on non-renewable resources, such as mined metals.[243] Manufacturing of photovoltaic panels, wind turbines and batteries requires significant amounts of rare-earth elements[290] which has significant social and environmental impact if mined in forests and protected areas.[291] Due to co-occurrence of rare-earth and radioactive elements (thorium, uranium and radium), rare-earth mining results in production of low-level radioactive waste.[292] In Africa, the green energy transition created a mining boom, causing deforestation and creating possibility to zoonotic spillover. To mitigate climate change and prevent epidemics some territories should stay intact.[293]

In 2020 scientists published a world map of areas that contain renewable energy materials as well as estimations of their overlaps with "Key Biodiversity Areas", "Remaining Wilderness" and "Protected Areas". The authors assessed that careful strategic planning is needed.[294][295][296] Solar panels are recycled to reduce electronic waste and create a source for materials that would otherwise need to be mined,[297] but such business is still small and work is ongoing to improve and scale-up the process.[298][299][300]

History

Prior to the development of coal in the mid 19th century, nearly all energy used was renewable. The oldest known use of renewable energy, in the form of traditional

water power, wind, in grain crushing windmills, and firewood
, a traditional biomass.

In 1885,

Werner Siemens, commenting on the discovery of the photovoltaic effect
in the solid state, wrote:

In conclusion, I would say that however great the scientific importance of this discovery may be, its practical value will be no less obvious when we reflect that the supply of solar energy is both without limit and without cost, and that it will continue to pour down upon us for countless ages after all the coal deposits of the earth have been exhausted and forgotten.[304]

Die protestantische Ethik und der Geist des Kapitalismus (The Protestant Ethic and the Spirit of Capitalism), published in 1905.[305] Development of solar engines continued until the outbreak of World War I. The importance of solar energy was recognized in a 1911 Scientific American article: "in the far distant future, natural fuels having been exhausted [solar power] will remain as the only means of existence of the human race".[306]

The theory of

depletion of oil, as well as for an escape from dependence on oil, and the first electricity-generating wind turbines appeared. Solar had long been used for heating and cooling, but solar panels were too costly to build solar farms until 1980.[308]

New government spending, regulation and policies helped the industry weather the 2009 economic crisis better than many other sectors.[44]

See also

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External links

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