Tesla Solar & Powerwall Bill Help
Why do I still have an electric bill with Tesla solar or a Powerwall?
Owning solar panels or a Powerwall doesn't necessarily mean your utility bill will always be zero. Here's how solar, battery and the grid fit together on your bill — and where to take each kind of question.
Independent resource. Utility Bill Advocates is an independent consumer-help resource. We are not affiliated with, endorsed by, sponsored by, or representing Tesla. Company names are used only to describe the topic of this guide.
The short answer
Your utility bill is based on the power you import from the grid, the power you export, when each happens, your utility billing plan and charges that solar credits can't offset. A Powerwall can shift stored solar to later hours, but grid imports can still happen — for example when the battery is empty, reserved for backup, or not set to cover peak hours. Check your Tesla app for production and battery activity, and your utility bill for imports, exports and your plan.
Who this is for
California households with Tesla solar panels, a Tesla Powerwall, or both, whose utility bill changed or is higher than expected.
Solar production vs. what your home uses
Solar panels produce the most power around midday. Many households use the most power in the late afternoon and evening — cooking, laundry, air conditioning, EV charging — when panels produce little or nothing.
Whatever your panels don't cover at that moment is pulled from the grid (an import). Extra power your panels make when you're not using it goes back to the grid (an export). Your utility bill is built from those imports, exports, the rate plan you're on, and fixed charges.
How a Powerwall fits in, at a high level
A Powerwall charges from solar (and in some setups from the grid) and discharges to power your home later. Depending on how it's configured, it may prioritize backup power, self-powering your home, or using stored energy during higher-priced hours.
If the battery runs out in the evening, keeps a large backup reserve, or its mode changed, your home imports more from the grid — and that shows up on your utility bill. The Tesla app shows these settings and your home's energy flow.
Grid imports and exports
Your utility measures power in both directions. Imports are billed according to your rate plan and time of day; exports earn credits under your billing plan. Under California's newer solar billing plans, exported power may be credited at values that vary by hour, so using your own solar and battery power can matter more than exporting it.
Why you can still get a bill after going solar
Evening and nighttime use
Power you use when the sun is down usually comes from the grid unless a battery covers it.
Fixed charges and fees
Some monthly charges can't be offset by solar credits. SDG&E, for example, notes that NEM customers may still owe fixed charges and fees even when they generate more than they use.
Time-of-use pricing
Power imported during higher-priced hours costs more, while exports may be credited at different values depending on your billing plan.
Seasonal changes
Shorter winter days mean less production; hot summers can mean more AC use than panels cover.
Usage that grew
A new EV, pool pump, heat pump or more people at home can outpace what the system was sized for.
Billing-plan cycles
Depending on your plan, some charges may settle monthly or on a longer cycle, such as an annual true-up statement.
A step-by-step solar bill check
1. Confirm which billing plan you're on
Your bill or online account should show whether you're on a legacy net energy metering (NEM) plan or a newer plan such as a Solar Billing Plan, and your time-of-use rate.
2. Compare the same month last year
Look at total grid imports, exports and billing days — not just the dollar amount.
3. Check your system's production
Use your installer's or equipment maker's monitoring app to see whether production dropped (shading, dirt, an error or an inverter issue).
4. Look at when you use power
Heavy use between late afternoon and evening often costs more on time-of-use plans.
5. Review your battery settings
If you have a battery, check its mode and backup reserve in the app.
6. Separate fixed charges from usage
Identify which charges would appear no matter how much solar you produce.
7. Write down your questions
Equipment questions go to your installer; billing and rate questions go to your utility.
Tesla vs. your utility: who handles what
Ask Tesla about
Your panels, inverter, battery, monitoring app, production that seems low, error messages, warranty, service visits and the terms of your purchase, loan or lease.
Ask your utility about
Your billing plan, rate plan, meter readings, import and export amounts, credits, fixed charges, true-up or billing cycle, and payment options.
Utility Bill Advocates can help with
Understanding the utility-bill side in plain language and preparing clear questions — we don't service equipment or change your account.
Questions to ask
For your installer
Is my system producing what it's expected to for this time of year? Are there any alerts or errors? How is my battery configured? Did any settings change after an update or service visit?
For your utility
Which billing plan and rate plan am I on? How are my exports credited? Which charges can't be offset by solar credits? When does my billing cycle or true-up settle? Is there a rate plan that better fits my usage?
More solar bill help
My Wattie · Coming Soon
A plain-language helper for your bill.
My Wattie, our upcoming AI-powered utility companion, is being designed to explain your utility bill — including imports, exports and credits — in everyday language. It won't control your Powerwall or replace Tesla support. It isn't available yet.
Meet My Wattie and join early accessCommon questions
Should a Powerwall make my bill zero?
Not necessarily. Your bill depends on grid imports, your billing plan, time-of-use pricing and charges that credits can't offset. A battery can reduce imports but doesn't guarantee a zero bill.
Who do I call about my Powerwall or solar app?
Contact Tesla for equipment, app, production or battery questions. Contact your utility for billing plan, rate and credit questions.
Is Utility Bill Advocates part of Tesla?
No. Utility Bill Advocates is independent and is not affiliated with, endorsed by or representing Tesla.
Official sources to verify
Program rules, amounts and deadlines can change. Always confirm current details with the official program or your utility.
Want help understanding the utility side of your solar bill?
Answer a few quick questions about your home and utility. It's free and takes about a minute.
Utility Bill Advocates is an independent company. We are not a utility company or government agency. Program availability and eligibility vary. We never ask for your Social Security number, banking information or utility login.