Tesla Powerwall 3 Cost in California (2026): Installed Price, Rebates and Sizing

What Tesla's quote shows, and what to ask it to separate

Tesla sells Powerwall 3 through its own design tool and through certified installers. The design tool does not display a price until you enter the address where the battery will go, because the scope of work depends on your electrical panel, the wall or garage where the unit mounts, and whether you are adding solar at the same time. That is also why a price you read in a forum post or a sales flyer is not a number to budget around.

When the quote arrives, ask for it broken into lines. You want the battery hardware, any Expansion unit, the backup switching equipment, electrical labor, any main-panel upgrade or backup-loads subpanel, trenching or long conduit runs, permit and inspection fees, and any roof or stucco repair. A lump-sum figure hides the part of the job that varies most from house to house, which is the electrical work, and it makes a second quote impossible to compare line for line.

The installed-cost benchmark, and how to read your quote against it

Lawrence Berkeley National Laboratory's Tracking the Sun report (2024 Edition) is the most careful public study of what homeowners actually paid. Its regression analysis implies a price premium of roughly $750 to $1,000 per kWh of storage for paired residential systems installed in 2023. For one 13.5 kWh Powerwall 3, that is about $10,100 to $13,500. It is a national estimate from 2023 installs, not a California quote, so treat it as a sanity check rather than a target.

LBNL's August 2026 data update adds two useful facts. Among residential systems bought with cash in 2025, the median price of a solar-plus-storage system was $2.1 per watt higher than a solar-only system. And about 80% of the installed-price data for paired systems came from California, so the benchmark is mostly built from California jobs.

To use it, take the battery-related lines of your quote, leave out any panel upgrade, and divide by the usable kWh you are buying. A result far above $1,000 per kWh is worth a question. The answer may be a legitimate one, such as a service upgrade your utility requires, but you should hear it before you sign.

Powerwall 3 specs that move the price

Tesla's 2025 datasheet lists 13.5 kWh of usable energy and on-grid output that can be configured at 5.8, 7.6, 10 or 11.5 kW. The unit has a built-in solar inverter with six maximum power point trackers and up to 20 kW of solar input. On a new solar-plus-battery job, that can remove the separate string inverter from the equipment list, which is part of why a combined Powerwall 3 job can cost less than the battery and inverter bought separately.

Tesla rates solar-to-home efficiency at 97.5% and solar-to-battery-to-home at 89%. The datasheet lists a 185 locked-rotor-amp load start rating, which matters if you want the battery to start a well pump or an air-conditioning compressor during an outage. The warranty is 10 years.

A site can hold up to four Powerwall 3 units and up to three Expansion units, seven units in total. At 13.5 kWh each, that is 94.5 kWh at the upper limit. Most homes buy one. LBNL reports that the median residential battery installed in 2025 was 13.5 kWh, the size of a single Powerwall.

Powerwall 2 vs. Powerwall 3: what actually changed

Both batteries hold the same 13.5 kWh of usable energy and carry a 10-year warranty, so the difference is not capacity. It is power, and what sits inside the box. Tesla's Powerwall 2 datasheet (the version dated July 2, 2024) lists 5 kW of continuous power and 7 kW for ten seconds at peak. The 2025 Powerwall 3 datasheet lists up to 11.5 kW continuous on grid, more than twice as much, and Tesla's support page rates Powerwall 3's motor start at 185 locked-rotor amps against 106 for Powerwall 2. That motor-start figure is what decides whether one battery can start a central air conditioner or a well pump when the grid is down.

The second change is the inverter. Powerwall 2 has none for solar, and Tesla describes it as designed to be added on to existing solar systems. Powerwall 3 has a built-in solar inverter with six maximum power point trackers and up to 20 kW of solar input, and Tesla describes it as designed for owners installing a new solar and storage system. If you are buying panels and a battery together, that is equipment you do not pay for twice. If you already own solar with a working inverter, the real question is how a new battery connects to it, which our guide to adding a Powerwall to existing solar works through.

Read the efficiency numbers with care, because Tesla does not measure them the same way. Powerwall 2 is rated at 90% round trip, AC to battery to AC. Powerwall 3 is rated at 89% from solar to battery to home and 97.5% from solar straight to the home. Powerwall 3 is also heavier, 291.2 lb installed against 251.3 lb, and one site can hold up to four Powerwall 3 units plus three Expansion packs, where Tesla's support page lists up to 10 units for Powerwall 2. Tesla's 2026 rebate, below, covered Powerwall 3 and Powerwall 3 Expansion only.

Which rebates apply to a Powerwall in California (September 2026)

There is no statewide Powerwall rebate. What you can claim depends on three things: whether Tesla's own offer covered your order, which utility or community choice aggregator (CCA) serves your address, and your household's outage history and income. Tesla keeps a list of California programs on its incentives page, but some entries there were out of date when we checked, so every figure below comes from the program's own page on the date shown.

Tesla's Next Million Powerwall Rebate paid $500 per Powerwall 3 or Powerwall 3 Expansion, up to $1,000 and up to two units per Tesla account, as a virtual Visa reward card. It covered orders placed from November 1, 2025 through June 30, 2026 and installed during 2026, and registration closed on June 30, 2026. If you registered in time, the final claim, with proof of payment and a screenshot of the Powerwall serial number, is due by December 31, 2026. It never applied to Powerwall 2.

PG&E's Permanent Battery Storage Rebate pays $7,500 per household to first-time battery customers whose account has had five or more Wildfire Safety outages since January 1, 2024, who are on a time-of-use rate, and who enroll the battery in the Emergency Load Reduction Program through their provider. PG&E lists Tesla's Virtual Power Plant as one way to enroll. The battery must have been bought on or after January 1, 2025. PG&E showed 179 rebates left as of September 18, 2026, and the application is due within 12 months of Permission to Operate or by December 31, 2026, whichever comes first.

SMUD pays an enrollment incentive to customers who put a battery on its Solar and Storage Rate and enroll within 90 days of Permission to Operate. It was $500 per kWh, up to $10,000, for projects submitted for interconnection by September 22 and enrolled by December 31, 2026. Interconnection applications received on or after September 23 get $300 per kWh, up to $6,000. SMUD also pays a quarterly incentive that it says is currently available only for Tesla batteries: $110 for one, $220 for two and $330 for three or more.

San Diego Community Power pays $350 per kWh for a new solar-and-battery system or $250 per kWh for a battery added to existing solar, rising to $500 and $350 per kWh for CARE, FERA and Community of Concern customers. The battery has to charge from solar, your contractor reserves the rebate before installation, and you agree to discharge half the battery during a weekday window, which pays another 10 cents per kWh. You cannot be enrolled in ELRP or the state's Demand Side Grid Support program at the same time.

Clean Power Alliance's Sun Storage Rebate pays $2,000 to a CPA customer who installs an eligible battery, plus $1,250 in Public Safety Power Shutoff areas and $250 for Medical Baseline or for CARE or FERA customers, but not both, up to $3,500 on a first-come, first-served basis. Anaheim Public Utilities pays up to $3,000 per household for a battery of at least 5 kWh if you stay on a time-of-use rate and in its MyPower Savings program for 12 months. Central Coast Community Energy's residential battery rebate closed to new applications on March 19, 2026, although Tesla's page still listed it.

Stack these against a quote, not a brochure. On LBNL's benchmark of about $10,100 to $13,500 for one installed Powerwall 3, a PG&E household that qualifies for the $7,500 rebate would be left with roughly $2,600 to $6,000 before any panel upgrade. Count only rebates you have confirmed in writing with the program, and read each program's rules on combining it with another, because PG&E, SGIP and the CCAs each set their own. The SGIP section below covers the income-limited state budgets, and our guide to solar and battery incentives by utility covers LADWP, Roseville and the other public utilities.

How many Powerwalls do you need?

Start from the job you want the battery to do. If the goal is lower bills under net billing, size the battery to the evening use you want to cover, which you can read off 12 months of hourly or 15-minute interval data in your utility account. A household that uses 10 to 12 kWh between late afternoon and bedtime is already close to what one Powerwall 3 stores.

If the goal is backup, list the circuits you need during an outage: refrigerator, internet, lights, a well pump, medical equipment, perhaps one air-conditioning zone. Power, not energy, is usually the limit. One unit can deliver up to 11.5 kW continuously on grid, and heavy motor loads need the start rating noted above.

A second unit adds cost almost in proportion to the hardware, while the permit, the backup switching equipment and part of the electrical labor are paid once. Ask your installer to price one and two units on the same visit so you can see the real cost of the second 13.5 kWh.

Powerwall 3 under NEM 3.0 net billing

Customers of PG&E, SCE and SDG&E who applied to interconnect on or after April 15, 2023 take service on the CPUC's net billing tariff. The CPUC says the credit for exported solar is usually lower than the retail rate, though it can rise above it on late summer evenings, and that customers can maximize bill savings by pairing a battery so they use or export stored energy during those high-value hours. Nearly 70% of net-billing customers had paired a battery with solar by the end of 2024, according to the CPUC.

The spread you capture depends on your rate. The CPUC Public Advocates Office reported average residential rates of 33.7 cents per kWh at PG&E, 34.4 cents at SCE and 45.5 cents at SDG&E as of June 2026. Net-billing customers must take the rate the CPUC approved for them: E-ELEC at PG&E, TOU-D-PRIME at SCE and EV-TOU-5 at SDG&E. The original customer keeps the tariff for nine years, and residential PG&E and SCE customers who apply before the end of 2027 get slightly higher export credits for those nine years.

None of this applies to municipal utilities such as LADWP or SMUD, which set their own rates and export rules. If you are served by one, build the battery case from its tariff, not from NEM 3.0.

SGIP rebates in September 2026

The Self-Generation Incentive Program tracker, with data as of September 23, 2026, shows the general residential category, Small Residential Storage, closed at Step 7 in the PG&E, SCE, SoCalGas and CSE budgets. The ratepayer-funded Residential Solar and Storage Equity category, Equity Resiliency, and the San Joaquin Valley residential category also show closed.

The remaining door is Residential Solar and Storage Equity under AB 209, which pays $1.10 per Wh for storage at Step 6 and is limited by income and other eligibility rules. The tracker shows its budgets waitlisted for CSE, SoCalGas and LADWP, waitlisted in the PG&E and SCE non-POU budgets, and open in the PG&E and SCE POU budgets. A column on a tracker is not an eligibility decision, and a waitlist is not a promise of money. Confirm with the program administrator before you count on it.

Federal tax credits: buying versus leasing

If you buy the battery, with cash or a loan, there is no federal credit on a 2026 installation. IRS guidance on Public Law 119-21 says the Section 25D credit is not allowed for expenditures made after December 31, 2025, and that an expenditure counts as made when the original installation is completed. A deposit paid in 2025 does not carry the credit into a 2026 install. A loan does not change that: you own the battery, so the same rule applies, and you pay interest on equipment with no federal credit behind it. Tesla's incentives page still says Powerwall is designed to qualify for the Federal Investment Tax Credit when it is charged entirely from solar; for a battery you own and install in 2026, the IRS guidance is what governs.

Under a lease or power purchase agreement, the company that owns the equipment may claim the commercial credit under Section 48E. The statute ends that credit for solar and wind property placed in service after December 31, 2027 unless construction began in time, but it states that the cut-off does not apply to energy storage. Whether any of the owner's credit reaches you depends on the contract, so compare the monthly payment and escalator against a cash quote rather than assuming a lease passes the credit through.

What a Powerwall can earn in a virtual power plant

A battery can also be paid for helping the grid. Sunrun reported that on September 9, 2026, it and Tesla dispatched 580 MW from more than 140,000 home batteries across the PG&E, SCE and SDG&E service areas, including about 110,000 Tesla Powerwalls, under the California Energy Commission's Demand Side Grid Support program and the CPUC's Emergency Load Reduction Program.

DSGS runs from May to October and pays for committed capacity and for measured load reduction during extreme events. The CPUC says the residential part of ELRP, Power Saver Rewards, sunset at the end of the 2025 program year. Payment terms depend on the program and the company enrolling you, so ask for them in writing, including how much charge the battery keeps in reserve for your own outages.

Installer bankruptcies and your battery warranty

The 10-year Powerwall warranty comes from Tesla. The workmanship warranty, the roof-penetration warranty and any lease or PPA come from whoever sold and installed the system, and several of those companies have filed for bankruptcy. Federal court dockets show Freedom Forever LLC filed Chapter 11 in Delaware on April 15, 2026 (No. 26-10522), and the court signed an order converting the case to Chapter 7 on August 7, 2026. Sunnova Energy International filed Chapter 11 in the Southern District of Texas on June 8, 2025 (No. 25-90160). SunPower Corporation filed Chapter 11 in Delaware on August 5, 2024 (No. 24-11649).

Before you sign, ask who holds the workmanship warranty, who holds the agreement if it is a lease or PPA, and whether either can be sold or assigned. Check the contractor's license yourself at the Contractors State License Board.

Is Powerwall 3 worth it? A short review of the trade-offs

On paper, Powerwall 3's strengths are the integrated solar inverter, the 11.5 kW continuous output and the motor-start rating, which together let one unit run more of a house than older AC-coupled batteries could. The weaker points are the ones a spec sheet cannot fix: a 10-year warranty on equipment you may want to run longer than that, a price you only learn from a site-specific quote, and savings that depend on your rate plan and your evening use.

It tends to make sense when you are adding solar and a battery together on a net-billing rate, when outages are a real problem where you live, or when you can enroll in a paid grid program. It makes less sense when your evening use is small, when you are on a municipal utility with generous export terms, or when a working battery would be replaced mainly for the efficiency gain.