In 2025, US electricity demand surged, and solar power emerged as a key player, handling a staggering 61% of the growth. This remarkable achievement highlights the pivotal role of solar energy in meeting the accelerating power demand. The surge in demand was a 3.1% increase, equivalent to a 135 terawatt-hour jump, making it the fourth-largest annual rise in the past decade. Solar generation, in turn, soared by an impressive 83 terawatt-hours, a 27% increase from the previous year, and the largest absolute gain of any power source. This single surge in solar output was enough to cover 61% of all new electricity demand nationwide, showcasing the efficiency and importance of solar energy in the US power grid.
The impact of solar power was particularly notable in Texas, the Midwest, and the Mid-Atlantic regions, where electricity demand rose the fastest. Solar generation met a significant portion of the demand growth in these areas, with 81% in Texas and the Midwest, and 33% in the Mid-Atlantic. The timing of solar generation was crucial, as it met the entire rise in US electricity demand during daytime hours between 10 am and 6 pm Eastern. Furthermore, the rapid expansion of battery storage allowed solar to contribute to demand growth during evening hours, from 6 pm to 2 am.
The adoption of battery storage is transforming solar power from a simple daytime energy source to a more flexible and versatile solution. California's utility-scale solar and battery generation has climbed 58% over the past six years, but the output during the sunniest hours has increased by only 8%. This indicates that more energy is being stored and used later, rather than being dumped onto the grid all at once. This flexibility is crucial for managing the variability of solar power and ensuring a stable and reliable energy supply.
The growth of solar power in 2025 was largely absorbed by rising electricity demand, allowing solar to scale alongside overall grid growth. This trend is expected to continue, as solar power has the potential to meet all the rise in electricity demand and more. With the surge in electricity demand, the case to build solar power has never been stronger, according to Dave Jones, chief analyst at Ember. The future of US electricity generation looks increasingly solar-powered, and the benefits of this transition are already being felt across the country.
