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title: "The Renewable Energy Cost Revolution: What Happened and What It Means" abstract: "The cost of solar photovoltaic electricity and onshore wind power has fallen by more than 90% since 2010, a rate of decline that was not predicted by most energy economists a decade ago. This transformation has made new renewable electricity generation cheaper than new fossil fuel generation in most of the world, fundamentally altering the economics of energy transition. Understanding how this happened, its limits, and what it implies for decarbonization is essential context for energy policy debates." topic: environment author: nonacademicresearch.org Editorial date: 2026-05-09

The Renewable Energy Cost Revolution: What Happened and What It Means

Abstract

The cost of solar photovoltaic electricity and onshore wind power has fallen by more than 90% since 2010, a rate of decline that was not predicted by most energy economists a decade ago. This transformation has made new renewable electricity generation cheaper than new fossil fuel generation in most of the world, fundamentally altering the economics of energy transition. Understanding how this happened, its limits, and what it implies for decarbonization is essential context for energy policy debates.

Background

In 2010, solar photovoltaic (PV) electricity cost approximately $400 per megawatt-hour (MWh) globally on a levelized basis — the all-in cost per unit of electricity accounting for capital costs, fuel, and operation over a plant's lifetime. At that price, solar was economically viable only with substantial subsidies and in high-solar-resource locations. Wind power was cheaper but still not cost-competitive with coal or natural gas in most markets.

The prevailing view among energy analysts at the time was that renewables would become cost-competitive with fossil fuels gradually — perhaps by 2040 or 2050 — and only after sustained policy support. The International Energy Agency's 2010 forecast for solar capacity by 2020 underestimated actual deployment by a factor of ten.

What actually happened is one of the most significant economic developments of the twenty-first century so far, with major implications for climate policy, geopolitics, and industrial strategy.

The Evidence

The Cost Decline: Magnitude and Speed

The International Renewable Energy Agency (IRENA) publishes annual global data on renewable energy costs. Its 2022 report documented that the global weighted-average levelized cost of electricity (LCOE) for utility-scale solar PV had fallen from $0.381/kWh in 2010 to $0.049/kWh in 2021 — an 89% decline in eleven years. Onshore wind fell 68% over the same period, to $0.033/kWh.

These costs are now well below the LCOE of newly built natural gas and coal plants in most markets. IRENA (2021) found that 162 gigawatts of renewable capacity added in 2020 had lower generation costs than the cheapest new coal option globally.

Wright's Law and Learning Curves

The mechanism behind these cost declines is well understood. Experience curves (Wright's law) describe a consistent empirical pattern: for many manufactured goods, cost declines by a fixed percentage — typically 15–25% — for every doubling of cumulative production. This pattern has held for solar PV with remarkable consistency for decades.

Farmer and Hepburn (2015, Joule) and Way et al. (2022, Joule) modeled this empirically. Way et al. found that if clean energy technologies continued following historical learning rates, the energy system transition to near-zero emissions would likely be cheaper in total than continuing with fossil fuels — even without additional climate policy — because of the expected continued cost declines. Their model covered solar, wind, batteries, and electrolyzers.

The cost declines in solar are primarily attributable to: improvements in silicon purification and wafer manufacturing efficiency; economies of scale in module manufacturing; accumulated installer experience reducing soft costs; and competitive pressure from Chinese manufacturers who captured much of global production volume.

The Storage Problem and Its Partial Resolution

A key limitation of variable renewable electricity from solar and wind is intermittency: electricity is generated only when the sun shines or wind blows, creating a mismatch with demand patterns. This requires either storage, flexible backup generation, or grid interconnection to balance supply and demand.

Battery storage costs have followed a similar trajectory to solar. BloombergNEF's 2022 Battery Price Survey found that lithium-ion battery pack prices fell from $1,200/kWh in 2010 to $132/kWh in 2021 — an 89% decline — and that prices were forecast to reach $100/kWh by 2024. At these prices, battery storage becomes economically viable for short-duration grid storage, enabling solar power to be dispatched after sunset.

However, long-duration storage — needed to cover multi-day or seasonal supply shortfalls — remains expensive and technically immature. Hydrogen produced from renewable electricity is one proposed solution but is not yet economically competitive at scale. This limits the ceiling for variable renewable penetration in systems without strong grid interconnection or alternative dispatchable low-carbon sources (nuclear, hydropower, geothermal).

Global Deployment

Solar PV capacity installed globally grew from approximately 40 gigawatts in 2010 to over 1,000 gigawatts by 2022, with China accounting for roughly one third of cumulative installations. Wind capacity grew similarly, reaching approximately 900 gigawatts globally by 2022.

Ember's Global Electricity Review (2023) found that wind and solar together generated approximately 12% of global electricity in 2022, up from around 1% in 2010. While this remains a minority share, the rate of growth and continued cost declines place the technologies on a trajectory to become dominant electricity sources within two decades under baseline policies.

Counterarguments

Skeptics of rapid energy transition raise several legitimate challenges. First, electricity represents only about 25% of final energy demand globally; decarbonizing heat, transportation, and industrial processes (steel, cement, chemicals) is substantially harder and more expensive. Second, the raw material requirements for solar panels, wind turbines, and batteries — particularly copper, lithium, cobalt, and rare earth metals — create potential bottlenecks in mining, refining, and supply chains. Third, integrating high shares of variable renewables into electricity grids requires extensive and expensive transmission infrastructure and system flexibility that lags behind generating capacity deployment.

What We Can Conclude

The renewable energy cost revolution is empirically established and robust. Solar PV and onshore wind are now the cheapest forms of new electricity generation in most of the world, a transformation that happened faster than almost any expert predicted. The mechanisms — manufacturing learning curves and scale — are well understood and suggest continued cost declines.

This does not mean the energy transition will be easy or automatic. The hard problems — storage, industrial process heat, grid integration, material supply — remain real. But the economic case for displacing fossil fuels in electricity generation no longer depends primarily on carbon pricing or policy mandates; the cost advantage is now structural.

References

• BloombergNEF. (2022). Battery price survey 2022. BloombergNEF.
• Ember. (2023). Global electricity review 2023. Ember Climate.
• Farmer, J.D., & Hepburn, C. (2015). Economics: Something new in solar. Nature, 521(7551), 135–136. https://doi.org/10.1038/521135a
• IRENA. (2021). Renewable power generation costs in 2020. International Renewable Energy Agency.
• IRENA. (2022). Renewable power generation costs in 2021. International Renewable Energy Agency.
• Sivaram, V. (2018). Taming the sun: Innovations to harness solar energy and power the planet. MIT Press.
• Way, R., et al. (2022). Empirically grounded technology forecasts and the energy transition. Joule, 6(9), 2057–2082. https://doi.org/10.1016/j.joule.2022.08.009