Texas is experiencing a quiet but profound shift in its electricity grid, as batteries and solar power are increasingly replacing natural gas peaker plants. Batteries now constitute nearly one in five peaking resources on the ERCOT grid, a substantial increase from less than 5% in 2022. This change is primarily due to the dramatic fall in utility-scale lithium-ion battery costs, which have dropped by approximately 90% over the past decade, making them a more economically viable option than gas plants that operate infrequently. Batteries also offer faster response times and predictable degradation, without the complexities of a gas supply chain.
This trend is particularly evident in Texas due to ERCOT's islanded grid, large installed solar capacity, deregulated market, and extreme summer demand. The surge in solar generation creates a predictable daily pattern of abundant power during the day, which batteries can store and then discharge during evening demand peaks, effectively doing the same job as peaker plants. The state's unique market conditions, including high-value evening discharge windows and a volatile market that rewards quick responses, make it an ideal environment for battery adoption.
Solar power is set to achieve significant milestones in Texas. For the first time, utility-scale solar generation is projected to surpass coal-fired generation in ERCOT in 2026, reaching an estimated 78 billion kilowatt-hours compared to coal's 60 billion kilowatt-hours. This milestone reflects a substantial shift, as solar's share of ERCOT's generation grew from 4% in 2021 to over 12% by 2025, while coal's share decreased. Texas is expected to account for approximately 40% of all new U.S. solar capacity additions in 2026, with major projects like the 837 MW Tehuacana Creek 1 Solar and Battery Energy Storage System contributing to this growth.
Battery storage capacity in Texas has also expanded dramatically. ERCOT now boasts approximately 18.9 GW of installed battery capacity ahead of summer 2026, nearly tripling the amount from two years prior. This makes ERCOT the grid with the most operating battery storage in the United States, surpassing California's CAISO, and representing about 37% of total U.S. capacity. Over 6,000 MW of new storage came online in the past year alone, with battery systems now powering up to 10% of Texas's load during peak discharge moments. Combined, wind and solar met 36% of total ERCOT demand, relieving pressure on gas-fired plants, especially during extreme weather events like the January 2024 winter storm.
Looking ahead, the U.S. Energy Information Administration (EIA) forecasts that combined wind and solar generation in ERCOT will surpass natural gas as the system's single largest source of electricity in 2026, reaching 189 million megawatt-hours compared to natural gas's 177 million MWh. This represents a structural shift that will have significant implications for energy infrastructure and grid operations. While natural gas remains a dominant source, its share of ERCOT's demand has declined from 47% in 2023-2024 to 43% in the first nine months of 2025. The rapidly expanding infrastructure in renewables and storage, including 20 GW of behind-the-meter projects announced in Texas over the past two years, is providing both grid stability and energy independence for localized areas.
