NEM 2.0 vs NEM 3.0: What Changed and What It Means for California Solar in 2026

If you're researching solar in California, you've probably run into the terms NEM 2.0 and NEM 3.0. The difference between them is the single biggest factor affecting solar economics in the state right now. Here's a clear, no-spin breakdown of what changed, what it means for your wallet, and whether solar still makes financial sense in 2026. Spoiler: it does — but the strategy is different now.

What NEM 2.0 Was: The Golden Era of California Solar

NEM 2.0 — Net Energy Metering 2.0 — was the framework that made California the solar capital of the country. The concept was simple: when your solar panels produced more electricity than your home used, the excess flowed back to the grid and you received a credit at roughly the full retail rate. That meant export credits of $0.30 to $0.45 per kWh, depending on your utility and rate plan.

The math was generous. A kWh you sent to the grid at noon was worth almost the same as a kWh you pulled from the grid at 8 PM. You could oversize your system, bank credits during sunny months, and draw them down in winter. Many homeowners saw their annual utility bills drop to just the minimum connection charges. Payback periods for purchased systems typically ran 5 to 8 years.

What NEM 3.0 Changed: The 75-85% Export Rate Cut

On April 15, 2023, California's new Net Billing Tariff — widely called NEM 3.0 — took effect. The CPUC replaced retail-rate export credits with values based on the Avoided Cost Calculator, which estimates what your exported electricity is actually worth to the grid at any given hour.

The result: average export credits dropped to roughly 5 to 8 cents per kWh. That's a 75-85% reduction from NEM 2.0 rates. And unlike NEM 2.0's relatively flat credits, NEM 3.0 export values fluctuate by hour, month, and utility. Peak afternoon hours pay slightly more, while midday — when solar production is highest and the grid is already flooded with solar — export values can drop to near zero.

Here's what that looks like by utility. Under NEM 2.0, PG&E customers earned around $0.35-$0.42/kWh for exports. Under NEM 3.0, that same export earns roughly 5-8 cents. SCE went from $0.30-$0.38 to the same 5-8 cent range. SDG&E dropped from $0.38-$0.45 down to 5-8 cents. The exact values vary by time of day and season, but the magnitude of the cut is consistent across all three major investor-owned utilities.

Grandfathering Rules: Who Still Gets NEM 2.0

If your solar system received Permission to Operate (PTO) before April 15, 2023, you were grandfathered into NEM 2.0 for 15 to 20 years from your interconnection date — depending on your utility. You keep the old retail-rate export credits for the duration of that grandfathering period. Nothing about NEM 3.0 affects you unless you make a significant modification to your system.

The key exception: if you substantially expand your system — adding panels beyond a certain capacity threshold — the additional capacity (or in some cases your entire system) may be moved to NEM 3.0 rates. Adding a battery to an existing NEM 2.0 system generally does not trigger a switch, but rules vary by utility, so confirm with your provider before making changes.

Payback Period: NEM 2.0 vs NEM 3.0 Side by Side

This is where the impact hits hardest for homeowners buying systems outright. Under NEM 2.0, typical payback periods were 5 to 8 years for a cash purchase. Under NEM 3.0, without a battery, payback stretches to 9 to 14+ years. That's a meaningful difference — especially if you're not planning to stay in your home for 15+ years.

The extended payback is entirely driven by the lower export value. You're still saving money on every kWh you consume directly from your panels. But the kWh you export — which used to be worth $0.30-$0.45 — now earns a fraction of that. If your household is empty during the day and you're exporting 50-60% of production, the hit is substantial.

Why Batteries Changed the NEM 3.0 Equation

Battery storage is the single most important factor in making NEM 3.0 economics work. The logic is straightforward: instead of exporting midday solar to the grid at 5-8 cents per kWh, you store it in a battery and use it yourself during peak evening hours when utility rates hit 40-70+ cents per kWh.

With a properly sized battery, self-consumption rises from roughly 40-60% (solar only) to 80-90% (solar + battery). Every kWh you keep and use yourself retains its full retail value rather than being exported at the discounted NEM 3.0 rate. For a household paying $300 per month, a battery can add $70-$100 in monthly savings compared to a solar-only system under NEM 3.0.

March 2026 Court Ruling: NEM 3.0 Is Here to Stay

If you were holding out hope that NEM 3.0 would be overturned or significantly modified, the March 2026 court ruling put that to rest. The court upheld the CPUC's Net Billing Tariff with no major modifications. NEM 3.0 is the law of the land for the foreseeable future. Waiting for a policy reversal is not a viable strategy.

Meanwhile, utility rates continue climbing. PG&E, SCE, and SDG&E have all filed for or received rate increases through 2028. Every year you wait, the utility cost you're trying to offset gets higher — but so does the gap between what you pay the utility and what you'd pay with solar.

Does Solar Still Make Sense Under NEM 3.0?

Yes — but the strategy has fundamentally shifted. Under NEM 2.0, the playbook was "produce as much as possible and export the excess." Under NEM 3.0, the playbook is "produce, store, and consume as much as possible yourself." The economics still work because California utility rates are among the highest in the nation. Even with reduced export credits, the savings from self-consumed solar power — especially with a battery — are substantial.

The homeowners who benefit most are those paying $200+ per month to their utility, with good roof exposure, and a system that includes battery storage. For those homeowners, solar + battery typically delivers 30-50% monthly savings compared to utility-only costs.

The PPA Advantage Under NEM 3.0

Here's where things get interesting. The longer payback period under NEM 3.0 is a problem if you're buying a system outright — you're tying up $25,000-$40,000 and waiting 9-14 years to break even. But with a Power Purchase Agreement (PPA), the payback period is irrelevant to you. The PPA provider owns the system, handles the economics, and sells you the power at a fixed rate that's lower than what your utility charges.

You get panels on your roof at no cost out of pocket. Instead of paying your utility a different amount every month and never knowing what your bill will be, you pay a fixed monthly payment that's typically 30 to 50% less than your current utility cost. All year round, for as long as you live there. The PPA provider takes on the NEM 3.0 risk — the longer payback, the battery optimization, the export rate fluctuations. You just get a lower, predictable bill.

This is arguably why PPAs have become the dominant solar model in California since NEM 3.0. The economics shifted in a way that makes third-party ownership more attractive for the homeowner than buying outright — unless you have the capital, plan to stay 15+ years, and want to capture the full long-term value.