Between March and June 2026, clean energy rewrote the record books across the United States. Solar, wind, and batteries posted milestone after milestone during the spring shoulder season—the stretch of mild weather when renewables tend to shine brightest and grid demand stays relatively low.
These records spanned the country’s largest power markets, from California and Texas to New York, touching everything from battery output to solar’s share of national electricity generation.
Solar Outpaces Coal Nationally for the First Time in May
For the first time in US history, solar generation outproduced coal across an entire calendar month. In May 2026, solar became the country’s third-largest source of electricity, surpassing a fuel that once dominated the grid.
The shift reflects years of diverging investment. Solar has led the nation in new capacity construction for five consecutive years, while no new coal plants are under development—though the Trump administration has moved to keep existing facilities open regardless of their competitive viability.
What makes the milestone structurally significant is that coal faces no inherent time-of-day limitation. Those plants can run around the clock. Solar cannot. Yet even with that constraint, solar generated more gigawatt-hours during daylight hours than coal managed across the full month. Analysts expect solar to surpass coal for an entire season next, and eventually for a full calendar year.
California Batteries Cover 44% of Demand and Push Gas to Near Zero
California produced some of the season’s most striking numbers. On the evening of March 29, battery storage covered 44% of demand on the CAISO grid, which serves roughly 80% of the state. At 7 p.m. that day, batteries discharged over 12 gigawatts—more than New York City consumes on a hot summer afternoon.
On May 16, gas plants supplied less than 3% of demand during a four-hour evening window, according to analysis by the Institute for Energy Economics and Financial Analysis. New wind supply contributed to that result: the SunZia wind farm in New Mexico began delivering power to California this spring. On the same date in 2025, gas had generated 3.6 gigawatts overnight. By 2026, that figure had fallen to just 560 megawatts.
Extending the clean energy window further into the night remains a challenge. Most California batteries sustain peak discharge for four hours, leaving a gap before sunrise when solar resumes. On June 1, the state’s first eight-hour-duration battery came online in Southern California—an early indication of what longer storage can do for overnight supply.
Texas Sets Records for Solar, Wind, and Combined Renewables Output
Texas broke records across nearly every clean energy category this spring. On May 13, solar peaked at a record 34.4 gigawatts. Four days later, wind reached nearly 29 gigawatts at 11:50 p.m. The highest combined renewable output came on May 14, approaching 48 gigawatts.
The grid’s performance on March 14 illustrated the portfolio effect most clearly. Wind and solar together served 79% of demand that afternoon, and along with nuclear, zero-carbon sources held fossil fuels to just 13% of the fuel mix for a five-hour stretch.
Batteries also set a record on the evening of March 13, delivering 10.4 gigawatts and meeting 20% of demand at that moment. The timing of Texas resources works in the grid’s favor: solar peaks at midday while wind often strengthens after sunset, reducing reliance on gas across a longer daily window than either resource could manage alone.
New York Sets a Solar Record Driven Largely by Small-Scale Rooftop Systems
New York reached a solar milestone on June 3, when generation hit a record 5.6 gigawatts and supplied 29% of statewide demand at noon, according to the New York Independent System Operator. The composition of that output is worth noting.
Nearly all of it came from small-scale, customer-sited systems. Utility-scale solar contributed only 530 megawatts — less than the output of individual large projects in the Southwest. New York has not built significant battery storage comparable to California or Texas, yet the record demonstrates that distributed rooftop installations can produce meaningful grid contributions without large desert-scale solar farms. Where geography limits utility-scale development, smaller installations can still add up.
Context: Why Shoulder-Season Records Matter and What Comes Next
Spring shoulder conditions—mild temperatures, modest demand, and long daylight hours—are the most favorable circumstances renewables will face all year. Records set during this period reflect a demonstrated ceiling, not typical performance. Summer heat waves will test whether solar, wind, and batteries can displace gas when fossil fuel plants historically reach their highest output.
The records still matter for infrastructure planning. Each milestone expands the documented range of what the grid can handle, informing decisions about storage procurement, transmission investment, and capacity targets. The structural trend is straightforward: solar capacity keeps growing, battery deployment has accelerated sharply over the past five years, and wind resources are reaching new markets through projects like SunZia. The Trump administration’s efforts to keep coal plants operating may slow retirements, but they do not reverse the capacity growth driving these records. The next major test arrives this summer, when the grid faces the conditions that have historically favored fossil fuels most.
Kelly is an experienced writer with 15 years of experience exploring the big stories that shape our world, from tech breakthroughs and space exploration to climate, energy, and the fascinating quirks of science. She has a talent for turning complex ideas into sharp, memorable insights that stay with readers long after they’ve finished reading.
