Published April 2, 2026 · Updated June 1, 2026 · 6 min read
The short answer
In California in 2026, yes — a battery is what makes solar economical. NEM 3.0 cut export credits about 75–80%, so the savings come from storing your daytime solar and using it during the expensive 4–9 PM peak. A battery also delivers backup power during outages.
By Vinnie Curcie, Founder & CEO
Short answer: yes, under NEM 3.0
If your solar is on NEM 3.0 — the Net Billing Tariff that applies to PG&E, SCE, and SDG&E interconnections after April 15, 2023 — then a battery isn't a luxury add-on, it's the part that makes the economics work. Without storage, the surplus your panels make during the day is exported to the grid for a credit that's roughly 75–80% lower than it was under NEM 2.0.
Reason 1: time-of-use arbitrage
California's investor-owned utilities bill on time-of-use (TOU) rates, with the most expensive window from about 4–9 PM — right when the sun is low and your panels produce little. A battery solves the timing mismatch: it charges with cheap solar midday and discharges during peak, so you stop buying grid power at the highest rates. That daily 'arbitrage' is where modern solar savings come from.
Reason 2: backup power during outages
Solar panels alone shut off during a grid outage for safety — so without a battery, a blackout leaves you dark even on a sunny day. A battery like the Tesla Powerwall keeps your essentials (or your whole home, depending on sizing) running through Public Safety Power Shutoffs and storm outages, and recharges from your panels the next day.
What about SGIP and other battery rebates?
California's Self-Generation Incentive Program (SGIP) has historically offered battery rebates, but the general-market budgets largely closed at the end of 2025. A limited income-qualified pathway may remain for eligible households. We'll tell you honestly whether you qualify rather than dangle a rebate you can't actually get — and the battery's value case stands on TOU savings and backup even without it.
Sizing the battery to your real life
How much storage you need depends on your evening usage, whether you want whole-home or essentials backup, and loads like EV charging or air conditioning. We size storage to your actual usage profile — enough to carry you through peak and an outage, without overselling capacity you'll never cycle. As a Tesla Powerwall Premier Certified installer, we install to Tesla's standard.
FAQ
In practical terms, yes. Under NEM 3.0, exported solar earns very little, so a battery — which lets you use your own power during the expensive 4–9 PM peak — is what turns solar into real savings, plus it gives you backup during outages.
Incentives and rates change. This page is kept current — but always confirm specifics for your home.
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