Renewable energy capacity has steadily grown, led by solar photovoltaic power.
Events currently not included in the timelines include:
goal-codifying policy about, commercialization of, adoptions of, deployment-statistics of, announced developments of, announced funding for and dissemination of sustainable energy -technologies and -infrastructure/systems
research about related phase-outs in general – such as about the fossil fuel phase out
A study provides results of simulations and analysis of "transactive energy mechanisms to engage the large-scale deployment of flexible distributed energy resources (DERs), such as air conditioners, water heaters, batteries, and electric vehicles, in the operation of the electric power system".[2][3]
Researchers describe a way for "inherently robust, scalable method of integration using multiple energy storage systems and distributed energy resources, which does not require any means of dedicated communication improvised controls", which could make microgrids easy and low cost "where they are needed most" such as during a power outage or after a disaster.[5][6]
Research on solar energy since 2020 has focused on improving the efficiency, durability, and recyclability of photovoltaic technologies. Alongside steady industrial cost declines, laboratories and firms have reported world-record efficiencies in perovskite and tandem solar cells, new approaches to recycling end-of-life modules, and integration of PV in agrivoltaics and building materials.[7]
A 2023 review by the International Energy Agency described continued declines in solar PV costs and noted that research into perovskite–silicon tandem cells and recycling of photovoltaic modules represents "the most active innovation area" in renewable energy.[8] Recent media analyses highlight how next-generation materials such as perovskites and quantum-dot photovoltaics are transitioning from laboratory prototypes to commercial lines.[9][10][11]
This section summarizes major research advances in photovoltaic and solar-power technology from 2020 onward; for policy or deployment statistics, see Solar power and Timeline of solar cells.
6 March – Scientists show that adding a layer of perovskite crystals on top of textured or planar silicon to create a tandem solar cell enhances its performance up to a power conversion efficiency of 26%. This could be a low cost way to increase efficiency of solar cells.[14][15]
13 July – The first global assessment into promising approaches of solar photovoltaic modules recycling is published. Scientists recommend "research and development to reduce recycling costs and environmental impacts compared to disposal while maximizing material recovery" as well as facilitation and use of techno–economic analyses.[16][17]
3 July – Scientists show that adding an organic-based ionic solid into perovskites can result in substantial improvement in solar cell performance and stability. The study also reveals a complex degradation route that is responsible for failures in aged perovskite solar cells. The understanding could help the future development of photovoltaic technologies with industrially relevant longevity.[18][19][importance?]
2021
12 April – Scientists develop a prototype and design rules for both-sides-contacted siliconsolar cells with conversion efficiencies of 26% and above, Earth's highest for this type of solar cell.[20][21][importance?]
21 May – The first industrial commercial production line of perovskite solar panels, using an inkjet printing procedure, is launched in Poland.[24]
13 December – Researchers report the development of a database and analysis tool about perovskite solar cells which systematically integrates over 15,000 publications, in particular device-data about over 42,400 of such photovoltaic devices.[25][26]
16 December – ML System from Jasionka, Poland, opens first quantum glass production line. The factory started the production of windows integrating a transparent quantum-dots layer that can produce electricity while also capable of cooling buildings.[27][importance?]
2022
30 May - A team at Fraunhofer ISE led by Frank Dimroth developed a 4-junction solar cell with an efficiency of 47.6% - a new world record for solar energy conversion.[28][importance?]
13 July – Researchers report the development of semitransparent solar cells that are as large as windows,[29] after team members achieved record efficiency with high transparency in 2020.[30][31] On 4 July, researchers report the fabrication of solar cells with a record average visible transparency of 79%, being nearly invisible.[32][33]
19 December – A new world record solar cell efficiency for a silicon-perovskite tandem solar cell is achieved, with a German team of scientists converting 32.5% of sunlight into electrical energy.[36][importance?]
2024
12 March – Scientists demonstrate the first monolithically integrated tandem solar cell using selenium as the photoabsorbing layer in the top cell, and silicon as the photoabsorbing layer in the bottom cell.[37]
Caltech reports the first successful beaming of solar energy from space down to a receiver on the ground, via the MAPLE instrument on its SSPD-1 spacecraft, launched into orbit in January.[50][51]
A study concludes that deploying floating solar panels on existing hydro reservoirs could generate 16%–40% (4,251 to 10,616 TWh/year) of global energy needs when not considering project-siting constraints, local development regulations, "economic or market potential" and potential future technology improvements.[52][53]
2022
Researchers develop floating artificial leaves for light-driven hydrogen and syngas fuel production. The lightweight, flexible perovskite devices are scalable and can float on water similar to lotus leaves.[54][55]
2023
An analysis concludes there is large potential (≈9,400 TWh/yr) for floating solar photovoltaics on reservoirs,[56][57] at the upper range of the prior 2020 study (see above).
Agrivoltaics
2021 – An improved agrivoltaic system with a grooved glass plate is demonstrated.[58][59]
2021 – A report reviews several studies[60][61] about the potential of agrivoltaics, which partly suggest "high potential of agrivoltaics as a viable and efficient technology" and outline concerns for refinements to the technology.[62]
2022 – Researchers report the development of greenhouses (or solar modules) by a startup that generate electricity from a portion of the spectrum of sunlight, allowing spectra that interior plants use to pass through.[63][64]
2023 – Demonstration of another agrivoltaicgreenhouse which outperforms a conventional glass-roof greenhouse.[65][66]
A study using simulations finds that large scale vertical-axis wind turbines could outcompete conventional HAWTs (horizontal axis) wind farm turbines.[77][78]
Scientists report that due to decreases in power generation efficiency of wind farms downwind of offshore wind farms, cross-national limits and potentials for optimization need to be considered in strategicdecision-making.[79][80]
Researchers report, based on simulations, how large wind-farm performance can be significantly improved using windbreaks.[81][82]
The world's first fully autonomous commercial "airborne wind energy" system (an airborne wind turbine) is launched by a company.[83]
An U.S. congressionally directed report concludes that "the resource potential of wind energy available to AWE systems is likely similar to that available to traditional wind energy systems" but that "AWE would need significant further development before it could deploy at meaningful scales at the national level".[83]
Researchers increase water electrolysis performance of renewable hydrogen via capillary-fed electrolysis cells.[88][89]
A novel energy-efficient strategy for hydrogen release from liquid hydrogen carriers with the potential to reduce costs of storage and transportation is reported.[90][91]
Chemical engineers report a method to substantially increase conversion efficiency and reduce material costs of green hydrogen production by using sound waves during electrolysis.[100][101]
Engineers report the development of a prototype wave energy converter that is twice as efficient as similar existing experimental technologies, which could be a major step towards practical viability of tapping into the sustainable energy source.[115][116]
A study investigates how tidal energy could be best integrated into the Orkneyenergy system.[117] A few days earlier, a review assesses the potential of tidal energy in the UK's energy systems, finding that it could, according to their considerations that include an economic cost-benefit analysis, deliver 34 TWh/y or 11% of its energy demand.[118][119]
In two studies, researchers report that substitution of PET adhesive tapes could nearly prevent[clarification needed]self-discharge in the widely used lithium-ion batteries, extending battery life.[122][123][124] Analysts describe 2020s battery-technology progress as pivotal for renewable integration, citing new chemistries, improved safety, and reduced critical-material use.[125]
2021 – A company generates its first power from a gravity battery at a site in Edinburgh.[128] Other gravity batteries are also under construction by other companies.[129]
2022 – A study describes using lifts and empty apartments in tall buildings to store energy, estimating global potential around 30 to 300 GWh.[130][131]
The US has been counting on private industry to lead in fusion power, while more recently China's government has made fusion a national priority. In 2025, $2.1 billion was poured into a single Chinese state-owned fusion company, an amount two and a half times the U.S. Energy Department's annual fusion budget.
2020
Assembly of ITER, which has been under construction for years, commences.[133]
The Chinese experimental nuclear fusion reactor HL-2M is turned on for the first time, achieving its first plasma discharge.[134]
[Record] On December 5, the National Ignition Facility records the first experiment to surpass scientific breakeven, achieving an energy gain factor of Q = 1.54, producing more fusion energy than the laser beam delivered to the target. Laser efficiency is on the order of 1%.[148]
2023
[Record] On February 15, 2023, Wendelstein 7-X reached a new milestone: Power plasma with gigajoule energy turnover generated for eight minutes.[149]
On February 21, 2023, the first proton-boron fusion via magnetic confinement is reported at Japan's Large Helical Device.[150]
JT-60SA achieves first plasma in October, making it the largest operational superconducting tokamak in the world.[151]
On 18 December, Joint European Torus pulses its final plasma before decommissioning, after over 40 years of operation.
2024
In June, the HH70 tokamak, built by the Chinese company Energy Singularity, achieves first plasma. It is the first fusion device to exclusively use high-temperature superconducting magnets.[152]
On February 12, the CEA's WEST machine was able to maintain a plasma for more than 22 minutes. This was a 25% improvement on the previous record time achieved with EAST, in China, a few weeks previously.[154]
Reviews about WHR in the aluminium industry[157] and cement industry[158] are published.
2023
A report by the company Danfoss estimates EU's excess heat recovery potential, suggesting there is "huge, unharnessed potential" and that action could involve initial mapping of existing waste heat sources.[159]
Growth in solar and wind power from the first half of 2024 to the first half of 2025 increased more than the growth in overall demand for electricity, reducing reliance on fossil fuels and helping to curb greenhouse gas emissions.
Research about sustainable energy in general or across different types.
Research and development of (technical) means to substantially or systematically reduce need for energy beyond smart grids, education / educational technology (such as about differential environmental impacts of diets), transportation infrastructure (bicycles and rail transport) and conventional improvements of energy efficiency on the level of the energy system.
2020
A study shows a set of different scenarios of minimal energy requirements for providing decent living standards globally, finding that – according to their models, assessments and data – by 2050 global energy use could be reduced to 1960 levels despite 'sufficiency' still being materially relatively generous.[171][172][173]
2022
A trial of estimated financial energy cost of refrigerators alongside EU energy-efficiency class (EEEC) labels online finds that the approach of labels involves a trade-off between financial considerations and higher cost requirements in effort or time for the product-selection from the many available options which are often unlabelled and don't have any EEEC-requirement for being bought, used or sold within the EU.[174][175]
Researchers report that mining for renewable energy production will increase threats to biodiversity and publish a map of areas that contain needed materials as well as estimations of their overlaps with "Key Biodiversity Areas", "Remaining Wilderness" and "Protected Areas". The authors assess that careful strategic planning is needed.[176][177][178]
2021
Neodymium, an essential rare-earth element (REE), plays a key role in making permanent magnets for wind turbines. Demand for REEs is expected to double by 2035 due to renewable energy growth, posing environmental risks, including radioactive waste from their extraction.[179]
Researchers assess to what extent international law and existing policy support the practice of a proactive knowledge management system that enables systematic addressing of uncertainties about the environmental effects of seabed mining via regulations that, for example, enable the International Seabed Authority to actively engage in generating and synthesizing information.[186]
Nauru requested the ISA to finalize rules so that The Metals Company be approved to begin work in 2023.[195]
China's COMRA tested its polymetallic nodules collection system at 4,200 feet of depth in the East and South China Seas. The Dayang Yihao was exploring the Clarion–Clipperton zone (CCZ) for China Minmetals when it crossed into the U.S. exclusive economic zone near Hawaii, where for five days it looped south of Honolulu without having requested entry into US waters.[196]
Belgian company Global Sea Mineral Resources (GSR) and the German Federal Institute for Geosciences and Natural Resources (BGR) conduct a test in the CCZ with a prototype mining vehicle named Patania II. This test was the first of its kind since the late 1970s.[2]
Supporters of mining were led by Norway, Mexico, and the United Kingdom, and supported by The Metals Company.[195]
Chinese prospecting ship Dayang Hao prospected in China-licensed areas in the Clarion Clipperton Zone.[196]
2024
Norway approved commercial deep-sea mining. 80% of Parliament voted to approve.[201]
On February 7, 2024, the European Parliament voted in favor of a Motion for Resolution, expressing environmental concerns regarding Norway's decision to open vast areas in Arctic waters for deep-sea mining activities and reaffirming its support for a moratorium.[202][203]
In July 2024, at the 29th General Assembly of the International Seabed Authority in Kingston, Jamaica, 32 countries united against the imminent start of mining for metallic nodules on the seafloor.[204] In his address titled "Upholding the Common Heritage of Humankind", President Surangel S. Whipps Jr. of Palau spoke about exploitation and modern-day colonialism.[205][206]
In December 2024 Norway suspended deep sea mining, after the Socialist Left (SV) party said that otherwise, it would not support the budget.[208]
2025
On January 1st, 2025, Brazilian oceanographer Leticia Carvalho assumed the office of Secretary-General of the International Seabed Authority, after being elected in August 2024 to succeed Michael Lodge in the position.[209][210]
In April 2025, U.S. President Trump signed an Executive Order instructing the National Oceanic and Atmospheric Administration to expedite permits for companies to mine in both international and U.S. territorial waters, which would undermine the authority of the International Seabed Authority.[211]
Beginning in March and ending in July of 2025, the International Seabed Authority held their 30th session in Kingston, Jamaica, and again failed to agree on exploitative regulations for commercial deep sea mining in the Area.[212]
2026
The International Seabed Authority will begin their 31st session on February 23rd, 2026, as part of "Part 1" of the gathering, where the Legal and Technical Commission will meet. On March 6th, the session will end, before transitioning to a meeting of the Council from the 9th to 20th of the month. On June 29th, "Part 2" will commence, and will last until July 31st.[213]
Maintenance of sustainable energy systems could be automated, standardized and simplified and the required resources and efforts for such get reduced via research relevant for their design and processes like waste management.
2022
Researchers demonstrate electrostatic dust removal from solar panels.[214][215]
Economics
2021
A review finds that the pace of cost-decline of renewables has been underestimated and that an "open cost-database would greatly benefit the energy scenario community".[216][217] A 2022 study comes to similar conclusions.[218][219]
A study suggests that all sector defossilisation can be achieved worldwide even for nations with severe conditions. The study suggests that integration impacts depend on "demand profiles, flexibility and storage cost".[222][223]
↑"A decade of perovskite solar cell progress: From laboratory curiosity to commercial viability". Nature Reviews Materials. 7: 837–852. 2022. doi:10.1038/s41578-022-00455-9 (inactive 7 December 2025).{{cite journal}}: CS1 maint: DOI inactive as of December 2025 (link)
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↑Lin, Yen-Hung; Sakai, Nobuya; Da, Peimei; Wu, Jiaying; Sansom, Harry C.; Ramadan, Alexandra J.; Mahesh, Suhas; Liu, Junliang; Oliver, Robert D. J.; Lim, Jongchul; Aspitarte, Lee; Sharma, Kshama; Madhu, P. K.; Morales-Vilches, Anna B.; Nayak, Pabitra K.; Bai, Sai; Gao, Feng; Grovenor, Chris R. M.; Johnston, Michael B.; Labram, John G.; Durrant, James R.; Ball, James M.; Wenger, Bernard; Stannowski, Bernd; Snaith, Henry J. (2 July 2020). "A piperidinium salt stabilizes efficient metal-halide perovskite solar cells"(PDF). Science. 369 (6499): 96–102. Bibcode:2020Sci...369...96L. doi:10.1126/science.aba1628. hdl:10044/1/82840. PMID32631893. S2CID220304363. Archived(PDF) from the original on 13 September 2020. Retrieved 30 November 2020.
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↑Xiao, Han; Liu, Zhenwei; Zhang, Ran; Kelham, Andrew; Xu, Xiangyang; Wang, Xu (1 November 2021). "Study of a novel rotational speed amplified dual turbine wheel wave energy converter". Applied Energy. 301 117423. Bibcode:2021ApEn..30117423X. doi:10.1016/j.apenergy.2021.117423. ISSN0306-2619.
↑Almoghayer, Mohammed A.; Woolf, David K.; Kerr, Sandy; Davies, Gareth (11 November 2021). "Integration of tidal energy into an island energy system – A case study of Orkney islands". Energy. 242 122547. doi:10.1016/j.energy.2021.122547. ISSN0360-5442. S2CID244068724.
12Zhong, Raymond; Buckley, Chris; Bradsher, Keith; Stevens, Harry (13 December 2025). "Clean, Limitless Energy Exists. China Is Going Big in the Race to Harness It". The New York Times. Archived from the original on 13 December 2025. 2025 data through Dec. 5. Other countries include Germany, Britain, Canada, Japan, France, Israel, Sweden and Australia. Source: Fusion Energy Base
↑Talaei, Maryam; Mahdavinejad, Mohammadjavad; Azari, Rahman (1 March 2020). "Thermal and energy performance of algae bioreactive façades: A review". Journal of Building Engineering. 28 101011. doi:10.1016/j.jobe.2019.101011. ISSN2352-7102. S2CID210245691.
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