By Claire WhitakerNet metering in California is the billing arrangement that credits your home for the solar electricity you send back to the grid. By the end of this guide, you will understand how the current rules (commonly called NEM 3.0) value your exports, how to size a system around them, what paperwork your utility requires, and which mistakes tend to cost homeowners the most money over time.
What Net Metering Means in California
Under net metering, your solar array can produce more electricity than your home uses at a given moment. The surplus flows to the grid through your utility meter, and you get a credit on your bill. When your panels are not producing, such as at night, you draw power from the grid and use those credits or pay for the difference.
Shopping for one? See our guide: Net Metering Solar Program vs Self-Consumption: Which Is Better for Homeowners?.
California has changed its rules more than once. The original policy, NEM 1.0, credited exports at the full retail rate, one kilowatt-hour for one kilowatt-hour. That policy closed to new customers in 2016. The current framework, NEM 3.0 (formally the Net Billing Tariff), took effect for most customers of the state’s large investor-owned utilities in April 2023. It values exports at a lower, time-dependent rate, so the timing of your production matters far more than it used to.
Because the rules differ by utility and by the date your system was interconnected, check your own interconnection date and utility territory before making any assumptions about your credit.
Step 1: Confirm Which Net Metering Rules Apply to You
Your rate framework is set by the date your utility approved your solar interconnection, not the date you bought the panels. Start by finding that date and your utility.
- Pull the most recent bill from your utility and note the rate plan name.
- Check your utility’s net metering or solar page for the interconnection date cutoffs that apply to its customers.
- If you already have solar, look in your interconnection paperwork for the agreement or tariff reference.
- If you are planning a system, ask your installer in writing which tariff your application will be placed under.
Customers of municipal utilities and some smaller utilities may follow different schedules, so the statewide summary does not cover every case.
Step 2: Understand How Exports Are Valued
Export Credits Under NEM 3.0
Under the Net Billing Tariff, exported electricity is credited at a rate that reflects the utility’s avoided cost at the time you send power to the grid. Those rates are highest in the evening, when demand peaks and solar is no longer producing, and lowest in the middle of the day, when solar generation is heaviest across the grid. Your credit depends on when you export, not only how much you export.
Because midday export values are low, the usual design goal under NEM 3.0 is to produce enough power to meet your own needs during the day and to store the rest rather than sending it back.
Export Credits Under NEM 1.0 and 2.0
If you were interconnected under the earlier rules, your exports may still be credited at or close to retail rates. Those legacy agreements generally stay in force for the term they were approved under, so do not assume your system has been moved to the new tariff.
Step 3: Size Your System Around Self-Consumption
Sizing is where most of the real financial difference shows up. Under the current rules, a system sized to cover all of your annual usage on paper can still leave you with large grid charges if most production happens when you are away.
- Pull 12 months of usage data from your utility account, which is usually downloadable as a CSV file.
- Identify your daytime and evening usage. Note your highest-use months, such as summer for air conditioning.
- Estimate production using a solar calculator that accounts for your roof orientation, tilt, shading and local climate zone.
- Decide how much daytime load you can shift. Running a dishwasher, laundry or pool pump in the afternoon increases self-consumption.
- Compare a system sized to daytime needs against a larger one, using your installer’s modeled export and self-consumption figures.
| Factor | Why it matters | What to check |
|---|---|---|
| Roof orientation | West and southwest arrays shift production later in the day | Compass direction and tilt from your installer’s site survey |
| Shading | Even partial shade on a string can reduce output | Shade analysis report |
| Daytime load | Power used on-site is credited at full value | Hourly usage data from your utility |
| Battery capacity | Stored energy can cover evening peaks | Usable kWh and expected cycles per day |
| Utility rate plan | Time-of-use periods change the value of each kWh | Current tariff schedule and peak windows |
Step 4: Complete the Interconnection Process
Your utility must approve the system before you can operate it in parallel with the grid. The process typically moves through these stages:
- Submit the interconnection application with the system design and equipment specifications.
- Receive utility review and, if required, a supplemental review or study.
- Install the system under local permits and inspection requirements.
- Pass the city or county electrical inspection.
- Obtain utility permission to operate (PTO) and have the bidirectional meter installed or confirmed.
Do not switch the system on before PTO. Operating an unapproved system can lead to rejected applications and safety hazards for utility workers.
Step 5: Read the Net Metering Agreement Carefully
The interconnection agreement defines your export rate, how monthly credits roll over, what happens to unused credits at the end of the annual true-up period, and any non-bypassable charges. Read the sections on rate schedules and billing. If anything is unclear, ask your installer and utility for a written explanation before you sign.
Common Mistakes
- Sizing to annual kWh alone. Matching yearly usage does not guarantee low bills under time-dependent export values.
- Assuming you have the old rate. Check your interconnection date.
- Ignoring rate plan changes. Switching time-of-use plans can change your savings substantially.
- Skipping shade analysis. Partial shading can cut output more than the roof area suggests.
- Operating before PTO. Wait for written utility approval.
- Forgetting the annual true-up. Track the settlement date so you know when unused credits are handled.
Tips for Getting the Most from Net Metering
- Run high-energy appliances during the sunniest hours.
- Ask whether a battery is worth it for your evening load before committing.
- Review your bill for the first two billing cycles after PTO to confirm the rate is applied as expected.
- Keep your interconnection documents in one folder for future system changes or home sales.
Recommended gear
A basic energy monitor helps you see when your panels produce and when your home draws power, which is the information you need to plan around export values. Look for a clamp-on monitor that reads your main panel and supports solar production tracking. View on Amazon
A smart plug with energy metering lets you track and schedule individual appliances so you can shift loads into the afternoon. View on Amazon
A solar-rated surge protector for the inverter circuit can help protect the system from grid-side spikes, though it does not replace equipment specified by your installer. View on Amazon
For background on how the interconnection and billing layers work together, see How Grid-Tied Solar Works: Net Metering, Interconnection and Outages. For tax or financial decisions, consult a licensed tax professional or qualified solar financial advisor.
FAQ
Is net metering still available in California?
Yes. The state uses a net billing structure for most new interconnections under NEM 3.0, which credits exports at time-dependent values rather than full retail rates.
Does NEM 3.0 apply to my home?
It depends on your utility and the date your system was approved for interconnection. Your utility can confirm which tariff applies.
What is the difference between NEM 1.0 and NEM 3.0?
NEM 1.0 credited exports at full retail rates. NEM 3.0 credits exports at lower, time-varying rates that are generally highest in the evening.
Do I need a battery under NEM 3.0?
A battery is not required, but it can store midday production for use during evening peak periods, which often improves the value of your system.
What happens to unused credits?
Your interconnection agreement describes the annual true-up process, including how any remaining credits are settled.
Can I add panels to an existing system?
Expansions usually require a new or amended interconnection application, so the rate and export terms may change.
How long does interconnection take?
Timelines vary by utility and workload. Ask your installer for the current estimate and confirm the status with the utility.
Conclusion
Net metering in California now rewards homeowners who think about timing as well as total production. Confirm which tariff applies to your interconnection date, size your system around your daytime use, and read the agreement before you sign. A well-planned system matched to your usage pattern will serve you far better than one designed only around annual kilowatt-hours.
Related reading
- What Is Net Metering Cap? A Homeowner's Guide to Limits (2026)
- Solar Panels for Net Metering (2026): Which Should You Choose?
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About Claire Whitaker
Claire Whitaker is part of our editorial team and reviews and edits our home solar guides, checking product details against manufacturer specifications and owner feedback.
