What Sunrun Inc. told the SEC could break it.

Sunrun faces compounding solar tariffs: AD/CVD duties of 1.92%–534.67% on cells and modules from Vietnam, Malaysia, Thailand and Cambodia (the majority source of U.S. imports), 50% Section 232 tariffs on steel and aluminum, an open Section 232 polysilicon investigation, and reciprocal tariffs of 10–50% — all inflating module/equipment procurement costs and squeezing margins and demand.

“These countries have supplied the majority of imported solar cells and modules to the United States in recent years, and now face new country-wide final AD or CVD tariff rates ranging from 1.92% to 534.67%.”

The One Big Beautiful Bill Act (enacted July 4, 2025) significantly changed the IRA's Section 48(a)/48E investment tax credits, including an accelerated sunset of the 48E credit for solar facilities after 2027 — removing a core economic driver of residential solar demand and threatening Sunrun's installation volumes and project economics.

“On July 4, 2025, the One Big Beautiful Bill Act (“OBBB”) became law. The OBBB made a number of changes to the IRA that significantly impacted the availability of the credits under Sections 48(a) and 48E of the Internal Revenue Code of 1986 (the “Code”), including the accelerated sunsetting of the 48E credit for solar energy facilities after 2027.”

Key components for Sunrun's energy-storage systems — lithium-ion battery cells — are sourced primarily from China, and many suppliers import products and components from China and Vietnam; recently announced tariffs and potential future trade restrictions on these jurisdictions could significantly increase component costs and disrupt battery supply despite efforts to qualify non-China suppliers.

“many of the Company's suppliers import products and components from jurisdictions such as China and Vietnam that are subject to recently announced tariffs, which could significantly increase component expenses for key products, such as lithium-ion battery cells used in our energy storage systems that are currently sourced primarily from China.”

Sunrun's business is geographically concentrated, with California representing over 45% of its customer base and more than 45% of its installed energy systems as of year-end 2025; this exposes it to region-specific regulatory/rate changes (e.g., California net-metering) and natural disasters such as wildfires and earthquakes that could damage systems and disrupt operations.

“Our business is concentrated in certain markets, putting us at risk of region-specific disruptions. As of December 31, 2025, California represented over 45% of our customer base.”

Sunrun depends on a limited number of suppliers for solar panels and other system components; purchases from its top five suppliers were approximately $1.0 billion in 2025 (and $854.9 million in 2024), so disruption, default or price action by any of that small supplier group would materially raise costs or constrain installations.

“The Company depends on a limited number of suppliers of solar panels and other system components. During the years ended December 31, 2025 and 2024, the solar materials purchases from the top five suppliers were approximately $ 1.0 billion and $ 854.9 million, respectively.”