History of Solar Power Timeline

Beginning in 1982, the cost per kilowatt of photovoltaic systems was approximately 27,000 American dollars, reflecting how expensive solar technology remained at the time compared to conventional energy sources.

By 1992, the cost of a photovoltaic system had fallen to approximately 16,000 American dollars per kilowatt, showing steady progress in reducing the price of solar technology over the preceding decade.

By 2006, the cost per kilowatt of photovoltaic systems had dropped to approximately 4,000 American dollars, down dramatically from roughly 27,000 dollars per kW in 1982, driven by manufacturing improvements and economies of scale.

In 2008, the cost of a photovoltaic system stood at approximately 6,000 American dollars per kilowatt, less than half the 1992 level, continuing the long-term downward trend in solar pricing.

Between 2010 and 2020, the cost of utility-scale solar PV fell by 85%. Although concentrated solar power (CSP) capacity grew more than tenfold during this period, it remained a tiny proportion of the total because CSP costs only fell 68% in the same timeframe.

Most home batteries paired with solar are lithium-ion, mostly in the form of lithium iron phosphate batteries, especially since around 2021, though some nickel manganese cobalt batteries are also used.

Despite rising costs of materials such as polysilicon during the 2021–2022 global energy crisis, utility scale solar was still the least expensive energy source in many countries, due to the even faster rising costs of other energy sources such as natural gas.

As of 2021, the levelized cost of electricity from concentrated solar power (CSP) is over twice that of photovoltaics, making PV the dominant choice for new solar generation projects worldwide.

As of 2022, less than 1% of solar power comes from concentrated solar power (CSP), as falling photovoltaic costs have made PV overwhelmingly the preferred solar technology worldwide.

As of 2022, over 90% of the solar market uses crystalline silicon technology, which has remained the dominant photovoltaic material ever since the first silicon cells were developed in 1954.

In 2025 in the US, residential solar costs around 2.50 dollars per watt, though solar shingles cost considerably more, reflecting the dramatic decline in solar prices from tens of thousands of dollars per kilowatt decades earlier.

As of 2025, utility-scale solar costs are around 25 US cents per watt, an astonishing reduction from the roughly 27 dollars per watt of the early 1980s, making solar the cheapest source of new electricity in many regions.

According to a 2021 study, obtaining 25% to 80% of electricity from solar farms within their own territory by 2050 would require panels to cover land ranging from 0.5% to 2.8% of the European Union, 0.3% to 1.4% in India, and 1.2% to 5.2% in Japan and South Korea.

A 2021 International Energy Agency study projected that demand for copper will double by 2040, highlighting the growing material requirements of the clean energy transition, including solar power infrastructure.

For comparison, a combined cycle gas-fired power plant without carbon capture and storage emits around 500 g/kWh, and a coal-fired power plant about 1000 g/kWh, vastly exceeding the lifecycle emissions of solar power.

As of 2022, solar power carries an upfront carbon cost through production, with a carbon payback time of several years, but then offers clean energy for the remainder of the panels' roughly 30-year lifetime.

In 2022, over 40% of global polysilicon manufacturing capacity was located in Xinjiang in China, raising concerns about potential links to human rights violations in the region, including the Xinjiang internment camps.

As of 2022, the environmental impact of perovskite solar cells is difficult to estimate, but there is some concern that the lead content of these emerging next-generation panels may pose environmental problems.

Almost half the solar power installed in 2022 was mounted on rooftops, showing the growing importance of distributed residential and commercial solar alongside large utility-scale farms.

In 2022, global solar generation capacity exceeded 1 terawatt for the first time, a historic milestone demonstrating the massive scale that solar power has achieved since its early days as an expensive niche technology.

In 2024, solar generated 7% of global electricity and over 1% of primary energy (2.7% by the substitution method), adding twice as much new electricity generating capacity as coal.

China is currently the largest producer and installer of solar power capacity; globally, it produces 98% of solar wafers, 92% of solar cells and 85% of solar panels, and accounted for more than 55% of global installed solar capacity in the first half of 2025.

In 2025, solar power generated 9% of global electricity, continuing its rapid rise from a marginal technology to one of the world's most significant sources of electrical power.

Modelling by Exeter University suggests that by 2030, solar will be the least expensive source of electricity everywhere except in some Nordic countries, underscoring the technology's unstoppable economic momentum.

Utility-scale solar is forecast to become the largest source of electricity in all regions except sub-Saharan Africa by 2050, completing solar's transformation from a curiosity to the backbone of the world's power systems.