Fossil fuels just hit a record low in the US electricity mix last month, while solar and wind soared to all-time highs, according to fresh data from global energy think tank Ember.
In March 2025, fossil fuels accounted for less than 50% – 49.2% – of electricity generated for the first month on record. This beats the previous monthly record low of 51% set in April 2024.
“This clearly demonstrates the growing role of wind and solar in the US energy system,” said Nicolas Fulghum, senior analyst at global energy think tank Ember. “This is a first signal that the US is approaching a tipping point where clean power takes the lead over fossil generation, and where the importance of coal and gas inevitably starts to fade.”
What this means is that clean energy generated more than half – 50.8% – of US electricity for the first month on record. The record was driven by a surge in wind and solar power, which hit a new high of 24.4% of US electricity in March 2025.
In March 2025, US solar increased an astonishing 37% (+8.3 TWh) compared to March 2024. Wind increased by 12% (+5.7 TWh). Together, wind and solar reached an all-time high, generating 83 TWh of US electricity, 11% higher than the previous record of 75 TWh set in April 2024. Fossil fuel generation fell by 2.5% (-4.3 TWh) compared to March 2024.
The milestone is the result of a long-term decline of fossil generation in the US power sector, with wind and solar growing substantially over the last decade. In March 2015, fossil generation still provided 65% of US electricity generation. Wind and solar generation stood at just 5.7%. Since then, the share of wind and solar power has more than quadrupled.
“Wind and solar power are pushing fossil fuels out of the mix,” said Fulghum. “The reality on the ground is not one of a return to fossil fuels in the US, it’s the continued growth of solar and wind power that will be the dominant driver of electricity generation growth in the US.”
Solar power is set to account for more than half of new generating capacity installed in the US in 2025, with more than a third of new solar panels going to Texas. Solar adoption has exploded in just a decade. In March 2015, solar power accounted for just 1% of US electricity generation. By March 2025, it’s grown to 9.2%.
Last month, Ember published the report “US Electricity 2025,” which covered changes and trends in the US power sector in 2024. Solar was the fastest and largest growing source of electricity in the US in 2024. Wind and solar combined rose to a record 17% of the US electricity mix in 2024, overtaking coal for the first time, which accounted for 15%.
Read more: Made-in-America solar just got a big win in Louisiana
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