The US solar and energy storage sectors achieved several deployment and generation milestones in the first half of 2026, despite rising national electricity demand and climbing retail energy prices. Figures from the Solar Energy Industries Association (SEIA) show that these technologies are increasingly moving from emerging resources to primary components of the domestic power grid.
The trade group said grid operators from California to Texas and across the US Midwest have registered record-breaking performance metrics, driven by competitive technology costs and rapid installation timelines.
Solar and energy storage combined to account for 91% of all new electricity generation capacity added to the US grid in the first quarter of 2026. This represents the highest collective quarterly share ever recorded by the two technologies. Solar continues its five-year trend as the leading source of new US generation capacity, while utility-scale battery storage deployment continues to accelerate.
In May 2026, monthly electricity generation from solar resources exceeded generation from coal for the first time in US history. While solar accounted for a negligible fraction of the national energy mix a decade ago, it now supplies approximately 13% of total American electricity requirements.
On the evening of July 9, the battery storage fleet within the California Independent System Operator (CAISO) footprint discharged a record 12.99 GW of power. At its peak, this storage output covered 36% of total regional energy demand, mitigating supply strain during historically challenging post-sunset peak load hours.
The following day, July 10, CAISO established a new solar generation record of 23 GW, which successfully met 72% of the afternoon electricity demand in the region. This milestone marked the third time California surpassed its own solar generation record since June 1, 2026.
Meanwhile, the Electric Reliability Council of Texas (ERCOT) grid also logged multiple renewable energy and storage milestones throughout the spring and early summer:
- March 13: Battery storage systems supplied a record 20% of evening electricity demand.
- March 14: Total renewable generation met 79% of the state’s electricity demand.
- May 13: Solar generation hit a peak of 34.427 GW, which was subsequently eclipsed on July 9 with a 35.425 GW peak.
- May 14: Combined renewable resources set an absolute generation record of 52 GW.
Texas currently serves as the fastest-growing utility-scale solar market in the United States and holds the position of the second-largest energy storage market.
While California and Texas continue to lead in raw volume, major regional transmission organizations (RTOs) across the country recorded independent solar generation peaks. Over the last three months, the Southwest Power Pool (SPP), ISO New England (ISO-NE), the Midcontinent Independent System Operator (MISO), and the PJM Interconnection all established new solar generation records.
Notably, these generation peaks coincided with record-high maximum loads on these grids, underscoring the role of renewable assets in maintaining summer grid reliability.
From pv magazine USA
The post Solar and storage drive US grid growth in H1 with record Q1 capacity share appeared first on Energy Storage.
