US Solar Installations Fall 27% in Q1 2026 as Tax Credit Cliff Approaches
The US solar industry’s headline growth story has quietly inverted. SEIA’s Q2 2026 Solar Market Insight Report shows the US installed 7.8 GWdc of new solar capacity in Q1 2026 — a 27% decline from Q1 2025 and a 42% drop from Q4 2025. Utility-scale, the segment that has carried the industry’s growth for years, fell 34% year-over-year and 45% quarter-over-quarter to 5.9 GWdc. Residential was the lone bright spot, up 6% year-over-year to 1,179 MWdc, though still down 15% from the prior quarter.
Why the drop. Solar remained the leading source of new US generating capacity for a fifth straight year in 2025, adding 43 GW — so this isn’t a demand problem. It’s a policy and permitting problem. Interconnection queue timelines have improved only slightly, permitting bottlenecks persist, and the industry is now adjusting to what SEIA bluntly calls a “post-tax-credit world.” Distributed solar segments are expected to decline further through 2026 before residential growth resumes in 2027, when third-party ownership project tax credit eligibility and rising retail electricity prices are expected to provide a floor.
The regulatory overhang. Solar has been treated differently than other energy sources under the current administration’s permitting framework. Executive Order 14154 declared a national energy emergency and directed agencies to remove development burdens — but explicitly excluded solar, meaning solar projects can’t access the fast-track pathways available to other generation types. A separate order, EO 14315, directed Treasury to terminate wind and solar subsidies outright, and the Interior Department subsequently elevated final decision-making on solar and wind projects to the Secretary level, an added review step developers say is already causing delays.
Pricing is actually improving. Despite the installation slowdown, system economics are moving in the right direction. Wood Mackenzie/SEIA data show residential system pricing down 7% year-over-year and utility-scale pricing down 3% for both fixed-tilt and single-axis tracking configurations. Module prices fell more than 20% annually for the distributed generation segment and 8% for utility-scale — relief driven largely by the repeal of IEEPA tariffs that had ranged from 20–50% on sourcing from countries like Indonesia and Laos. Commercial system pricing is the outlier, up 4% year-over-year.
What resolves it. Wood Mackenzie frames 2026 as contingent on three open fronts: a Supreme Court ruling narrowing IEEPA tariff authority would restore procurement clarity; a judicial check on DOI’s elevated review process (mirroring successful wind-industry suits) could unstick federal-land permitting; and FERC transmission reforms would determine how fast solar-plus-storage can actually interconnect. None of these are solar-specific fixes — they’re structural questions about how much authority the executive branch can exercise over energy permitting, and the answers will shape deployment well beyond 2026.
The demand side isn’t the problem. Data center load growth and corporate sustainability commitments remain intact. Globally, cumulative installed solar capacity is projected to nearly triple from roughly 3 TWdc today to close to 8 TWdc by 2034. The gap between that demand trajectory and the Q1 2026 installation numbers is entirely a story about US permitting and policy — not about the underlying economics of the technology.