# NEM 3.0 and Battery Storage

How California net billing changed the home battery decision, and what buyers should ask before signing.

- Canonical: [https://homebattery.guide/guides/nem-3-battery-storage](https://homebattery.guide/guides/nem-3-battery-storage)
- Markdown: [https://homebattery.guide/guides/nem-3-battery-storage.md](https://homebattery.guide/guides/nem-3-battery-storage.md)
- Published: 2026-07-04
- Updated: 2026-07-12
- Author: Marcus Reed

## Quick answer

NEM 3.0 changed the value of exporting solar power and made batteries part of the default conversation for many California solar buyers. The right question is not "battery or no battery" but whether the quote models your actual rate plan and evening usage.

NEM 3.0 changed the value of exporting solar power and made batteries part of the default conversation for many California solar buyers. The right question is not "battery or no battery" but whether the quote models your actual rate plan and evening usage.

The goal is not to pick the biggest battery. The goal is to understand what the quote includes, whether the design fits your outage pattern, and what the same usable capacity should cost in your market.

A third option sits outside that framing: a battery on its own, charged from the grid, with no array at all. There is nothing to export in that case, so the savings lever is the time-of-use spread rather than export credit. [Does a home battery work without solar](/guides/home-battery-without-solar) sets out the charge rates, the runtime math and the tariff question to get answered in writing before signing.

## What to compare first

| Line item | What to expect | Why it matters |
| --- | --- | --- |
| Solar-only | Lower upfront cost | May export at lower value under net billing |
| Solar plus battery | Higher upfront cost | Can shift solar into expensive evening hours |
| Battery plus backup design | Adds resilience | Requires load planning and sometimes panel work |

## Quote red flags

- Installer uses generic savings charts.
- No export/import assumption is shown.
- Battery is sold as emotional backup with no bill model.

## What to ask before signing

1. What is the installed price per usable kWh?
2. Which loads are backed up, and for how long?
3. Is this whole-home backup or essential-loads backup?
4. Is panel work included, excluded, or unknown?
5. Which incentive assumptions are included, and what is the effective date?

## Commercial note

Home Battery Guide may earn from affiliate links or flat-fee referrals to named vetted installers. Rankings do not move with compensation. We do not sell the same lead to multiple installers, and a referred installer quote still has to pass the same quote check.

## FAQ

### What changed under NEM 3.0?
Export credits shifted away from the older retail-style economics, which makes storing and using your own solar more valuable for many buyers.

### Can I still save with solar-only?
Some buyers can. The answer depends on consumption, rate plan, export value, and installation price.

## Sources

- [California CPUC customer generation and net billing](https://www.cpuc.ca.gov/industries-and-topics/electrical-energy/demand-side-management/customer-generation/net-energy-metering-and-net-billing)
- [Berkeley Lab distributed solar and storage data](https://emp.lbl.gov/tracking-the-sun)