Return on investment, aka ROI, isn’t just a number in a homeowner’s proposal — it’s a survival metric for solar companies. Margins are tighter, financing is more expensive, and policy changes keep reshaping how solar is sold and valued. In California, NEM 3.0 shifted the market toward storage. Now, new legislation like the One Big Beautiful Bill (OBBB) (again, we didn’t name it) is changing the rules again.
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