Global new electricity generation capacity in 2024 was approximately seventy percent renewable — solar, wind, hydro, geothermal — with the largest single contributor being utility-scale solar. The corresponding share in 2014 was about thirty percent. The trajectory of renewable capacity additions has been steeper than virtually any forecast made in the early 2010s, including those produced by the renewable industry itself.
Why the curve bent
The dominant driver was learning-rate cost reduction. Solar photovoltaic module prices fell by approximately ninety percent between 2010 and 2024. Lithium-ion battery cell prices fell by roughly the same amount over a similar window. Onshore wind costs fell by about sixty percent. These are not the result of any single technological breakthrough; they are the cumulative effect of manufacturing scale, supply-chain optimization, and incremental engineering improvements compounding over many product cycles.
The economic consequence is straightforward: in most parts of the world, new utility-scale solar with battery storage now produces electricity at a lower lifetime cost per kilowatt-hour than new natural gas, and substantially lower than new coal. The transition from here is partly a question of capital deployment rather than technology development.
The hard parts that remain
The hard parts cluster in three areas. First, electricity grids built for centralized fossil-fuel generation must be substantially reshaped — transmission, balancing reserves, frequency control, and inter-regional connections — to accommodate variable renewable supply at high penetrations. The engineering is well understood; the regulatory and capital coordination are not.
Second, sectors that are not currently electrified — heavy industry, long-haul trucking, aviation, shipping, agriculture — face technical and economic hurdles that the electricity sector did not. Substitution paths exist (green hydrogen, ammonia, sustainable aviation fuel, electrified industrial heat) but they are at substantially earlier points on their cost-down curves.
Third, the materials supply chain for the transition itself — lithium, cobalt, nickel, copper, rare earths, polysilicon — is now itself a source of geopolitical and environmental friction. The renewable transition does not eliminate extraction; it shifts what is extracted and where.
The honest current status
The transition is happening, and at the level of the electricity sector it is accelerating. Whether it accelerates fast enough to keep within the temperature targets that climate models suggest is a question of policy, capital, and political will at the level of national grids and global trade. The technology, at this point, is no longer the bottleneck.