US solar reaches 299.4 GW, pulled forward by a tax-credit deadline
Serguey Asael Shinder2 min readThe United States has reached 299.4 GWdc of cumulative solar capacity across more than 6.2 million systems, according to the latest U.S. Solar Market Insight report from the Solar Energy Industries Association (SEIA) and Wood Mackenzie. The industry installed 11.4 GWdc in the second quarter of 2026 alone — up 45% year on year and 43% on the first quarter.
Utility-scale led it, at 9.6 GWdc of the quarter, up 61% year on year. The report attributes part of the surge to developers expediting projects ahead of the July 2026 safe harbor deadline for federal tax-credit eligibility. Solar and storage together made up 70% of all new generating capacity added in the quarter. On manufacturing, more than $18 billion has gone into US solar factories across 43 states, module capacity has reached 75.3 GW with 14.4 GW under construction, and cell capacity stands at 10.6 GW with 19.1 GW being built.
What it means
A deadline pulled capacity forward, so read the growth rate with that in mind. A 45% year-on-year quarter is real capacity, but part of it is timing: projects that would have landed later were rushed to beat a tax-credit cutoff. The quarters after a safe-harbor deadline usually show the payback, and the trend line matters more than the peak.
Manufacturing scaling is the structural half. A one-third-of-households milestone is a headline; $18 billion of factory investment across 43 states and 75 GW of module capacity is the thing that decides whether the next 300 GW is built domestically or imported.
"Nameplate DC powers 50 million homes" is a modelled equivalence, not a delivery. 299 GWdc is installed capacity, not generation, and solar produces on solar's schedule. The figure is a fair scale marker and a poor description of what the grid actually receives at 7 p.m.