Net metering rollbacks in California (NEM 3.0) slashed rooftop solar payback to 12+ years

In December 2022, the California Public Utilities Commission approved NEM 3.0 (also called the Net Billing Tariff), which reduced the credit homeowners receive for exporting excess solar electricity to the grid by approximately 75%. Under the previous NEM 2.0 policy, homeowners received close to the full retail rate (roughly $0.30 per kWh) for every kilowatt-hour they sent back to the grid. Under NEM 3.0, the export credit dropped to roughly $0.05 to $0.08 per kWh depending on the time of day, with values changing hourly based on an "avoided cost calculator." This matters because the simple payback period for a typical residential solar installation in California jumped from 5-6 years under NEM 2.0 to 12-15 years under NEM 3.0 without battery storage. For a homeowner spending $25,000 on a solar system, that is the difference between a clear financial win and a marginal bet that depends on utility rate increases continuing at historical rates for over a decade. The financial case that drove California to lead the nation in rooftop solar was gutted overnight. The immediate consequence was a collapse in California residential solar installations. Applications dropped 80% in the months following NEM 3.0 implementation in April 2023. Solar installers laid off thousands of workers. SunPower, one of the largest residential solar companies in the U.S., filed for bankruptcy in August 2024, citing NEM 3.0 as a contributing factor. The homeowners who installed under NEM 2.0 are grandfathered for 20 years, creating a two-tier system where your neighbor's identical solar panels earn 5x what yours earn depending on when they were installed. This persists because utilities successfully argued that net metering at retail rates constitutes a cross-subsidy from non-solar customers to solar customers, since solar homes still use the grid for reliability but pay less into grid maintenance. This argument has political power because non-solar customers are disproportionately lower-income renters. The structural issue is that rooftop solar compensation is set by state utility commissions that are heavily lobbied by investor-owned utilities, and there is no federal standard for distributed generation compensation. At the root, the problem is that rooftop solar was marketed and sold for 15 years on the assumption of retail-rate net metering, and neither regulators, installers, nor homeowners built the financial models around the possibility that those credits would be cut by 75% with only 4 months of notice. The policy risk was always there, but the industry pretended it was not.