Renewable energy

Definition

Renewable energy is usually understood as energy harnessed from continuously occurring natural phenomena. The International Energy Agency defines it as "energy derived from natural processes that are replenished at a faster rate than they are consumed". Solar power, wind power, hydroelectricity, geothermal energy, and biomass are widely agreed to be the main types of renewable energy. ^[21] Renewable energy often displaces conventional fuels in four areas: electricity generation, hot water/space heating, transportation, and rural (off-grid) energy services. ^[22]

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,^{[ contradictory ]}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. ^[12] 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. ^[23]

Role in addressing climate change

As part of the global effort to limit climate change, most countries have committed to net zero greenhouse gas emissions. ^[24] In practice, this means phasing out fossil fuels and replacing them with low-emissions energy sources. ^[12] This much needed process, coined as "low-carbon substitutions" ^[25] in contrast to other transition processes including energy additions, needs to be accelerated multiple times in order to successfully mitigating climate change. ^[25] 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. ^[26] The European Union aims to generate 40% of its electricity from renewables by the same year. ^[27]

Other benefits

Renewable energy is more evenly distributed around the world than fossil fuels, which are concentrated in a limited number of countries. ^[28] 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. ^[29]

Intermittency

The two most important forms of renewable energy, solar and wind, are intermittent energy sources: they are not available constantly, resulting in lower capacity factors. In contrast, fossil fuel power plants are usually able to produce precisely the amount of energy an electricity grid requires at a given time. Solar energy can only be captured during the day, and ideally in cloudless conditions. Wind power generation can vary significantly not only day-to-day, but even month-to-month. ^[30] This poses a challenge when transitioning away from fossil fuels: energy demand will often be higher or lower than what renewables can provide. ^[31] Both scenarios can cause electricity grids to become overloaded, leading to power outages.

In the medium-term, this variability may require keeping some gas-fired power plants or other dispatchable generation on standby ^{[32] [33]} until there is enough energy storage, demand response, grid improvement, and/or baseload power from non-intermittent sources. In the long-term, energy storage is an important way of dealing with intermittency. ^[34] Using diversified renewable energy sources and smart grids can also help flatten supply and demand. ^[35]

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. ^[36] Similarly the industry sector can be coupled by hydrogen produced by electrolysis, ^[37] and the buildings sector by thermal energy storage for space heating and cooling. ^[38]

Building overcapacity for wind and solar generation can help ensure sufficient electricity production even during poor weather. In optimal weather, it may be necessary to curtail energy generation if it is not possible to use or store excess electricity. ^[39]

Solar energy

A small, rooftop PV system in Bonn, Germany

Komekurayama photovoltaic power station in Kofu, Japan

Solar power produced around 1.3 terrawatt-hours (TWh) worldwide in 2022, ^[10] representing 4.6% of the world's electricity. Almost all of this growth has happened since 2010. ^[57] 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. ^[58]

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. ^[12] PV is far more widespread, accounting for around two thirds of the global solar energy capacity as of 2022. ^[59] It is also growing at a much faster rate, with 170 GW newly installed capacity in 2021, ^[60] compared to 25 GW of solar thermal. ^[59]

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, ^[12] orienting a building to the sun, using construction materials that can store heat, and designing spaces that naturally circulate air. ^[61]

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. ^[62]

Photovoltaics

Main articles: Growth of photovoltaics, Solar power by country, and List of photovoltaic power stations

A photovoltaic system, consisting of solar cells assembled into panels, converts light into electrical direct current via the photoelectric effect. ^[65] 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. ^[12]

PV systems range from small, residential and commercial rooftop or building integrated installations, to large utility-scale photovoltaic power station. ^[66] A household's solar panels can either be used for just that household or, if connected to an electrical grid, can be aggregated with millions of others. ^[67]

The first utility-scale solar power plant was built in 1982 in Hesperia, California by ARCO. ^[68] The plant was not profitable and was sold eight years later. ^[69] However, over the following decades, PV cells became significantly more efficient and cheaper. ^[70] As a result, PV adoption has grown exponentially since 2010. ^[71] Global capacity increased from 230 GW at the end of 2015 to 890 GW in 2021. ^[72] PV grew fastest in China between 2016 and 2021, adding 560 GW, more than all advanced economies combined. ^[73] Four of the ten biggest solar power stations are in China, including the biggest, Golmud Solar Park in China. ^[74]

Wind power

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. ^[12] 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. ^[81] 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%. ^[82]

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. ^[83]

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. ^[62]

Hydropower

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. ^[87] 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. ^[88] 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. ^[89]
• 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. ^[90] However many run-of-the-river hydro power plants are micro hydro or pico hydro plants.

Much hydropower is flexible, thus complementing wind and solar. ^[91] In 2021, the world renewable hydropower capacity was 1,360 GW. ^[73] Only a third of the world's estimated hydroelectric potential of 14,000 TWh/year has been developed. ^{[92] [93]} 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. ^[94] 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. ^[95] It is popular to repower old dams thereby increasing their efficiency and capacity as well as quicker responsiveness on the grid. ^[96] 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 ^{[97] [98]} 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. ^[99]

Bioenergy

Biomass is biological material derived from living, or recently living organisms. Most commonly, it refers to plants or plant-derived materials. As an energy source, biomass can either be used directly via combustion to produce heat, or converted to a more energy-dense biofuel like ethanol. Wood is the most significant biomass energy source as of 2012 ^[103] and is usually sourced from a trees cleared for silvicultural reasons or fire prevention. Municipal wood waste – for instance, construction materials or sawdust – is also often burned for energy. ^[104] The biggest per-capita producers of wood-based bioenergy are heavily forested countries like Finland, Sweden, Estonia, Austria, and Denmark. ^[105]

Bioenergy can be environmentally destructive if old-growth forests are cleared to make way for crop production. In particular, demand for palm oil to produce biodiesel has contributed to the deforestation of tropical rainforests in Brazil and Indonesia. ^[106] In addition, burning biomass still produces carbon emissions, although much less than fossil fuels (39 grams of CO₂ per megajoule of energy, compared to 75 g/MJ for fossil fuels). ^[107]

Some biomass sources are unsustainable at current rates of exploitation (as of 2017). ^[108]

Biofuel

Main article: Biofuel

See also: Ethanol fuel, Sustainable biofuel, and Issues relating to biofuels

Biofuels are primarily used in transportation, providing 3.5% of the world's transport energy demand in 2022, ^[109] up from 2.7% in 2010. ^[110] Biojet is expected to be important for short-term reduction of carbon dioxide emissions from long-haul flights. ^[111]

Aside from wood, the major sources of bioenergy are bioethanol and biodiesel. ^[12] Bioethanol is usually produced by fermenting the sugar components of crops like sugarcane and maize, while biodiesel is mostly made from oils extracted from plants, such as soybean oil and corn oil. ^[112] Most of the crops used to produce bioethanol and biodiesel are grown specifically for this purpose, ^[113] although used cooking oil accounted for 14% of the oil used to produce biodiesel as of 2015. ^[112] The biomass used to produce biofuels varies by region. Maize is the major feedstock in the United States, while sugarcane dominates in Brazil. ^[114] In the European Union, where biodiesel is more common than bioethanol, rapeseed oil and palm oil are the main feedstocks. ^[115] China, although it produces comparatively much less biofuel, uses mostly corn and wheat. ^[116] In many countries, biofuels are either subsidized or mandated to be included in fuel mixtures. ^[106]

There are many other sources of bioenergy that are more niche, or not yet viable at large scales. For instance, bioethanol could be produced from the cellulosic parts of crops, rather than only the seed as is common today. ^[117] Sweet sorghum may be a promising alternative source of bioethanol, due to its tolerance of a wide range of climates. ^[118] Cow dung can be converted into methane. ^[119] There is also a great deal of research involving algal fuel, which is attractive because algae is a non-food resource, grows around 20 times faster than most food crops, and can be grown almost anywhere. ^[120]

Geothermal energy

Geothermal energy is thermal energy (heat) extracted from the Earth's crust. It originates from several different sources, of which the most significant is slow radioactive decay of minerals contained in the Earth's interior, ^[12] as well as some leftover heat from the formation of the Earth. ^[125] Some of the heat is generated near the Earth's surface in the crust, but some also flows from deep within the Earth from the mantle and core. ^[125] Geothermal energy extraction is viable mostly in countries located on tectonic plate edges, where the Earth's hot mantle is more exposed. ^[126] As of 2023, the United States has by far the most geothermal capacity (2.7 GW, ^[127] or less than 0.2% of the country's total energy capacity ^[128] ), followed by Indonesia and the Philippines. Global capacity in 2022 was 15 GW. ^[127]

Geothermal energy can be either used directly to heat homes, as is common in Iceland where almost all of its energy is renewable, or to generate electricity. At smaller scales, geothermal power can be generated with geothermal heat pumps, which can extract heat from ground temperatures of under 30 °C (86 °F), allowing them to be used at relatively shallow depths of a few meters. ^[126] Electricity generation requires large plants and ground temperatures of at least 150 °C (302 °F). In some countries, electricity produced from geothermal energy accounts for a large portion of the total, such as Kenya (43%) and Indonesia (5%). ^[129]

Technical advances may eventually make geothermal power more widely available. For example, enhanced geothermal systems involve drilling around 10 kilometres (6.2 mi) into the Earth, breaking apart hot rocks and extracting the heat using water. In theory, this type of geothermal energy extraction could be done anywhere on Earth. ^[126]

Enhanced geothermal systems

Enhanced geothermal systems (EGS) are a new type of geothermal power which does not require natural hot water reservoirs or steam to generate power. Most of the underground heat within drilling reach is trapped in solid rocks, not in water. ^[132] EGS technologies use hydraulic fracturing to break apart these rocks and release the heat they contain, which is then harvested by pumping water into the ground. The process is sometimes known as "hot dry rock" (HDR). ^[133] Unlike conventional geothermal energy extraction, EGS may be feasible anywhere in the world, depending on the cost of drilling. ^[134] EGS projects have so far primarily been limited to demonstration plants, as the technology is capital-intensive due to the high cost of drilling. ^[135]

Marine energy

Marine energy (also sometimes referred to as ocean energy) is the energy carried by ocean waves, tides, salinity, and ocean temperature differences. Technologies to harness the energy of moving water include wave power, marine current power, and tidal power. Reverse electrodialysis (RED) is a technology for generating electricity by mixing fresh water and salty sea water in large power cells. ^[136] Most marine energy harvesting technologies are still at low technology readiness levels and not used at large scales. Tidal energy is generally considered the most mature, but has not seen wide deployment. ^[137] The world's largest tidal power station is on Sihwa Lake, South Korea, ^[138] which produces around 550 gigawatt-hours of electricity per year. ^[139]

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. ^{[140] [141]}

Others

Usage by sector or application

Some studies say that a global transition to 100% renewable energy across all sectors – power, heat, transport and industry – is feasible and economically viable. ^{[161] [162] [163]}

One of the efforts to decarbonize transportation is the increased use of electric vehicles (EVs). ^[164] Despite that and the use of biofuels, such as biojet, less than 4% of transport energy is from renewables. ^[165] Occasionally hydrogen fuel cells are used for heavy transport. ^[166] Meanwhile, in the future electrofuels may also play a greater role in decarbonizing hard-to-abate sectors like aviation and maritime shipping. ^[167]

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 ^[168] 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. ^[169] Renewable thermal energy is also growing rapidly. ^[170] About 10% of heating and cooling energy is from renewables. ^[171]

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. ^[172] 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. ^[172]

^* = 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. ^{[177] [178] [179]}

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. ^[180]

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. ^[181]

Costs

Levelized cost: With increasingly widespread implementation of renewable energy sources, costs have declined, most notably for energy generated by solar panels. ^{[182] [183]}
Levelized cost of energy (LCOE) is a measure of the average net present cost of electricity generation for a generating plant over its lifetime.

Past costs of producing renewable energy declined significantly, ^[184] with 62% of total renewable power generation added in 2020 having lower costs than the cheapest new fossil fuel option. ^[185]

"Learning curves": Trend of costs and deployment over time, with steeper lines showing greater cost reductions as deployment progresses. ^[186] With increased deployment, renewables benefit from learning curves and economies of scale. ^[187]

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. ^[188]

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. ^[189] 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). ^[189]

As of 2022, an estimated 28% of the world's electricity was generated by renewables. This is up from 19% in 1990. ^[190]

Future projections

See also: Energy transition

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. ^[73] To achieve net zero emissions by 2050, IEA believes that 90% of global electricity generation will need to be produced from renewable sources. ^[17]

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." ^[192]

China's five year plan to 2025 includes increasing direct heating by renewables such as geothermal and solar thermal. ^[193]

REPowerEU, the EU plan to escape dependence on fossil Russian gas, is expected to call for much more green hydrogen. ^[194]

After a transitional period, ^[195] renewable energy production is expected to make up most of the world's energy production. In 2018, the risk management firm, DNV GL, forecasts that the world's primary energy mix will be split equally between fossil and non-fossil sources by 2050. ^[196]

Middle eastern nations are also  planning on reducing their reliance fossil fuel. Many planned green projects will contribute in 26% of energy supply for the region by 2050 achieving emission reductions equal to 1.1 Gt CO2/year. ^[197]

Massive Renewable Energy Projects in the Middle East: ^[197]

• Mohammed bin Rashid Al Maktoum Solar Park in Duba, UAE
• Shuaibah Two (2) Solar Facility in Mecca Province, Saudi Arabia
• NEOM Green Hydrogen Project in NEOM, Saudi Arabia
• Gulf of Suez Wind Power Project in Suez, Egypt
• Al-Ajban Solar Park in Abu Dhabi, UAE

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. ^[198]

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". ^[199]

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

Developing countries

In Kenya, the Olkaria V Geothermal Power Station is one of the largest in the world. ^[204] The Grand Ethiopia Renaissance Dam project incorporates wind turbines. ^[205] Once completed, Morocco's Ouarzazate Solar Power Station is projected to provide power to over a million people. ^[206]

Nuclear power proposed as renewable energy

Geopolitics

The geopolitical impact of the growing use of renewable energy is a subject of ongoing debate and research. ^[227] 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. ^[228] 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. ^[229]

Conversely, nations abundant in renewable resources, and the minerals required for renewables technology, are expected to gain influence. ^{[230] [231]} 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. ^[232] Nations rich in solar and wind energy could become major energy exporters. ^[233] Some may produce and export green hydrogen, ^{[234] [233]} 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). ^[235] 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. ^[236]

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. ^[237]

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. ^[238]

In October 2021, European Commissioner for Climate Action Frans Timmermans suggested "the best answer" to the 2021 global energy crisis is "to reduce our reliance on fossil fuels." ^[239] He said those blaming the European Green Deal were doing so "for perhaps ideological reasons or sometimes economic reasons in protecting their vested interests." ^[239] Some critics blamed the European Union Emissions Trading System (EU ETS) and closure of nuclear plants for contributing to the energy crisis. ^{[240] [241] [242]} 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." ^[243]

Metal and mineral extraction

The transition to renewable energy requires increased extraction of certain metals and minerals. Like all mining, this impacts the environment ^[244] and can lead to environmental conflict. ^[245] Wind power requires large amounts of copper and zinc, as well as smaller amounts of the rarer metal neodymium. Solar power is less resource-intensive, but still requires significant amounts of aluminum. The expansion of electrical grids requires both copper and aluminum. Batteries, which are critical to enable storage of renewable energy, use large quantities of copper, nickel, aluminum and graphite. Demand for lithium is expected to grow 42-fold from 2020 to 2040. Demand for nickel, cobalt and graphite is expected to grow by a factor of about 20–25. ^[246] For each of the most relevant minerals and metals, its mining is dominated by a single country: copper in Chile, nickel in Indonesia, rare earths in China, cobalt in the Democratic Republic of the Congo (DRC), and lithium in Australia. China dominates processing of all of these. ^[246]

Recycling these metals after the devices they are embedded in are spent is essential to create a circular economy and ensure renewable energy is sustainable. By 2040, recycled copper, lithium, cobalt, and nickel from spent batteries could reduce combined primary supply requirements for these minerals by around 10%. ^[246]

A controversial approach is deep sea mining. Minerals can be collected from new sources like polymetallic nodules lying on the seabed. ^[247] This would damage local biodiversity, ^[248] but proponents point out that biomass on resource-rich seabeds is much scarcer than in the mining regions on land, which are often found in vulnerable habitats like rainforests. ^[249]

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. ^[250] In several African countries, the green energy transition has created a mining boom, causing deforestation, and threatening already endangered species. ^[251]

Conservation areas

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. ^[252] 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. ^[253]

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. ^{[254] [255] [256]}

Recycling of solar panels

Solar panels are recycled to reduce electronic waste and create a source for materials that would otherwise need to be mined, ^[257] but such business is still small and work is ongoing to improve and scale-up the process. ^{[258] [259] [260]}

Public support

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. ^[261]

The same survey a year later shows that renewable energy is considered an investment priority in the European Union, China and the United States ^[262]

Solar power plants may compete with arable land, ^{[264] [265]} while on-shore wind farms often face opposition due to aesthetic concerns and noise. ^{[266] [267]} Such opponents are often described as NIMBYs ("not in my back yard"). ^[268] Some environmentalists are concerned about fatal collisions of birds and bats with wind turbines. ^[269] Although protests against new wind farms occasionally occur around the world, regional and national surveys generally find broad support for both solar and wind power. ^{[270] [271] [272]}

Community-owned wind energy is sometimes proposed as a way to increase local support for wind farms. ^[273] A 2011 UK Government document stated 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." ^[274] In the 2000s and early 2010s, many renewable projects in Germany, Sweden and Denmark were owned by local communities, particularly through cooperative structures. ^{[275] [276]} In the years since, more installations in Germany have been undertaken by large companies, ^[273] but community ownership remains strong in Denmark. ^[277]

Sources

• "Renewable Power Generation Costs in 2019" (PDF). IRENA. 2020.
• "Renewable Capacity Statistics 2020". IRENA. 2020.
• "Renewable Energy Statistics 2020". IRENA. 2020.