Clean energy crossed the tipping point
For the first time in energy history, clean power didn’t just grow alongside fossil fuels. It started replacing them — and the data makes the structural shift undeniable.
Ember’s 2025 global electricity data reveals a decisive inflection point: solar and wind output grew faster than total electricity demand, meaning renewables didn’t just absorb growth — they displaced existing fossil fuel generation for the first time on record. Solar alone added ~550 TWh of new generation, more than double the UK’s entire annual consumption (~280 TWh). Fossil fuel output declined by an estimated 1-2% in absolute terms, small but historically significant.
The Achilles heel is time-of-day economics. Using a simple Duck Curve framework, the gap between renewable generation peaks (midday) and demand peaks (6–9pm) still runs 40-80 GW in the US WECC grid alone on high-solar days. Battery storage is the required bridge — yet utility-scale storage currently covers less than 4 hours of average peak demand in most major economies, against the 6-8 hours analysts model as the threshold for reliable fossil displacement.
That duration gap is where the capital question lives. Project finance for long-duration storage (8–100 hours) remains structurally underfunded relative to lithium-ion 4-hour systems, which attract the majority of IRA and REPowerEU incentives. Flow batteries, compressed air, and iron-air technologies are technically proven but lack the standardized offtake structures that institutional capital requires at scale.
🔗 Source: https://www.ft.com/content/d525d8ea-9a07-4e22-8780-48bae3fdf2bb
