How Much Does a Home Battery Cost in California?
Straight answer: one whole-home battery of about 13.5 kWh costs roughly $10,000–17,000 installed before incentives, on three independent sources. California’s own incentive records show the spread: across 2,362 completed single-battery projects, the median reported cost was $16,200, and a quarter reported more than $19,000. The general-market SGIP rebate stopped taking applications at the end of 2025, and there is no federal credit for a battery installed in 2026.
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- One battery: in SGIP records the median completed single-battery project (~13 kWh) reported $16,200; a quarter reported more than $19,000.
- Size: the price per kWh falls as the system grows — about $2,390 per kWh under 8 kWh, $1,220 for one whole-home battery, $1,080 for two. Two whole-home batteries had a median of $28,800.
- Quotes vary: for the same Powerwall 3, developers reported $8,600 to $21,000 in state applications. Compare the battery line per kWh, at the cash price, with panel work and backup wiring as separate lines.
- Incentives: the general-market SGIP rebate closed to new applications at the end of 2025; the income-qualified tier pays $1.10 per watt-hour but was waitlisted in most territories on October 2, 2026. No federal credit in 2026.
- LADWP: customers were not shut out of SGIP — those with SoCalGas gas service applied through SoCalGas, and LADWP runs its own income-qualified budget, now on a waitlist.
One battery, three estimates
Each source counts something slightly different, which is why they make a range rather than a single number.
| Source | What it measures | One ~13.5 kWh battery |
|---|---|---|
| NREL / U.S. Department of Energy cost benchmark, Q1 2025 | Modeled market price of the same 8 kW system alone and with a 13.5 kWh battery: $2.95 vs $4.59 per watt; national, installed together with new solar | about $13,100 |
| California SGIP records, program years 2023–2025 | Median cost reported for 2,362 completed single-battery projects (~13 kWh) in the general-market budget | $16,200 |
| Berkeley Lab, 2024 installations | Median cash-price premium of a solar-plus-battery system over solar alone, $1.70 per watt of solar, on California’s median 5.7 kW system | about $9,700 |
Sources: DOE/NREL cost benchmarks · SGIP Weekly Statewide Report (September 27, 2026; Cali Energy analysis) · Berkeley Lab, Distributed Solar & Storage 2025 Data Update. Berkeley Lab’s premium is per watt of solar, so it scales with the array rather than the battery.
The model sits in the middle, the market premium low and the reported project costs high. NREL prices a battery installed with new solar, sharing the design, permit and crew, and leaves out financing. Berkeley Lab’s paired pricing is about 90% Californian and its median battery is 13.5 kWh — one Powerwall — but its premium is expressed per watt of solar. SGIP records are the full battery-project costs installers reported, including any financing cost built into the price. The spread between them reflects which costs each one counts, not a disagreement about the hardware.
What 6,891 completed projects reported, by battery size
California’s SGIP publishes every application with its battery size and reported cost. These are the completed general-market home projects of the last three program years.
| Battery size | Usually | Projects | Median cost | A quarter reported more than | Median per kWh |
|---|---|---|---|---|---|
| Under 8 kWh | One small battery or module | 78 | $9,800 | $12,700 | $2,390 |
| 8–12 kWh | One mid-size battery, or two small modules | 2,011 | $15,900 | $17,000 | $1,480 |
| 12–14.5 kWh | One whole-home battery (~13.5 kWh) | 2,362 | $16,200 | $19,000 | $1,220 |
| 14.5–17 kWh | One larger battery, or three small modules | 252 | $19,000 | $22,400 | $1,270 |
| 17–25 kWh | Two mid-size batteries, or several modules | 477 | $25,100 | $30,000 | $1,290 |
| 25–30 kWh | Two whole-home batteries | 1,657 | $28,800 | $33,200 | $1,080 |
| All sizes | Median project ~13 kWh | 6,891 | $17,000 | $25,000 | $1,280 |
Source: SGIP Weekly Statewide Report, September 27, 2026, Cali Energy analysis. Cost is the total eligible project cost reported by the applicant — equipment, installation, permits, interconnection, sales tax and any financing cost built into the price (SGIP Handbook). The 54 projects above 30 kWh are counted in “All sizes” only.
Three things stand out. Cost per kWh falls as the system grows, because the design, permit and crew visit are paid once: two whole-home batteries had a median of $28,800, not twice $16,200. Los Angeles is not an outlier: 1,298 completed projects in Los Angeles County reported a median of $17,000, the same as the state, and so did the 427 at homes served by LADWP. And these are records, not audited invoices: about one in eight single-battery entries is exactly $7,000, a cluster that drags the low end down, so the table shows the median and the upper quarter rather than the bottom.
By brand: what SGIP projects reported
Same records, split by battery maker.
| Maker | Projects | Median size, kWh | Median cost | Middle half | Median per kWh |
|---|---|---|---|---|---|
| Tesla (Powerwall) | 3,728 | 13.2 | $18,200 | $14,000–27,900 | $1,140 |
| Enphase | 1,427 | 9.7 | $16,900 | $13,500–22,200 | $1,550 |
| FranklinWH | 371 | 15.0 | $22,000 | $18,700–29,500 | $1,260 |
Source: SGIP Weekly Statewide Report, September 27, 2026; Cali Energy analysis. Makers with many identical reported amounts — a sign of standardized pricing rather than individual quotes — are left out. Sizes differ: Enphase systems are often built from smaller modules, so compare cost per kWh.
The median Tesla project, about one Powerwall, reported $18,200; Enphase projects were smaller and cheaper in total but cost more per kWh; FranklinWH projects were larger and reported the highest totals. The spread inside each brand is wider than the gap between brands, so the installer and the job matter more than the logo; see Powerwall vs Enphase vs FranklinWH.
What moves the price
The battery is only part of the line. These are the items that separate one quote from another.
Size
The price per kWh falls with capacity: in the records above, about $2,390 per kWh under 8 kWh against $1,080 for two whole-home batteries. How much you need is a separate question — see the battery sizing calculator.
Backup scope
Backing up chosen circuits means moving them to a backup subpanel; backing up the whole house means the battery must carry the full load or shed loads automatically, which often takes more battery power. See whole-home vs critical-loads backup.
The main panel
If the panel can’t take the battery, it has to be upgraded first — a separate line in the quote, not part of the battery price. See panel upgrade cost.
Location and permits
Where the battery goes decides the paperwork: in the City of Los Angeles, an indoor or garage battery goes to the Fire Department for approval and an outdoor one that meets its conditions does not. See battery safety and code.
How you pay
Financing can sit inside the price. The CFPB reports hidden fees in solar lending typically run 10–30% of the cash price and can exceed 50% (CFPB). Ask for the cash price.
Equipment
Chemistry, brand and whether the battery carries its own inverter change the price per kWh. The comparison is in the best home battery for backup.
With new solar, or added later
Timing changes the work, and no public dataset prices the difference.
NREL’s $13,100 is a battery installed together with new solar: one design, one permit, one crew. A battery added to an existing system is usually AC-coupled, needs its own permit and interconnection review, and in an older house is more likely to need main-panel work. SGIP records whether a site has solar, not when the battery went in, so they cannot isolate a retrofit premium, and we don’t publish one. Either way, ask for the battery priced as its own line and compare it with the table above. The tariff side of adding storage to an older system is in adding a battery to existing solar, and storage with no panels at all in a home battery without solar.
Compare the battery line per kWh, at the cash price
When the CPUC reviewed income-qualified SGIP applications in early 2026, developers had reported anywhere from $8,600 to $21,000 for the same Tesla Powerwall 3 equipment, and storage paired with solar averaged $1,640 per kWh in those applications — against the EnergySage 2026 California average of $1,030 that the Commission cited. The assigned commissioner called the ranges unreasonable and ordered extra cost checks (CPUC ruling, February 20, 2026). So divide the battery line by its kWh, compare the result with the medians above, and ask what the line includes: gateway, panel work, permits.
Incentives in 2026: what is left of SGIP
The rebate most homeowners used is gone; what remains is for income-qualified households and mostly waitlisted.
The budgets funded by utility ratepayers took their last applications on December 30, 2025, and their waitlists were closed. What remains is the Residential Solar and Storage Equity budget funded by the state under AB 209, for households at or below 80% of area median income or recently verified for programs such as CARE or FERA. It pays a flat $1.10 per watt-hour of storage plus $3.10 per watt of solar.
| Budget | Who it is for | Storage rate | Status |
|---|---|---|---|
| General Market — Small Residential Storage | Homeowners served by PG&E, SCE, SDG&E or SoCalGas | $0.15/Wh at its last step | Closed — last day to apply December 30, 2025 |
| Equity Resiliency | Eligible households in fire-threat or repeated-shutoff areas | $1.00/Wh | Closed |
| RSSE — Ratepayer | Income-qualified households | $1.10/Wh + $3.10/W solar | Closed |
| RSSE — AB 209 (CSE, SoCalGas, LADWP) | Income-qualified households in those territories | $1.10/Wh + $3.10/W solar | Waitlist |
| RSSE — AB 209 Non-POU (SCE, PG&E) | Income-qualified SCE and PG&E customers | $1.10/Wh + $3.10/W solar | Waitlist |
| RSSE — AB 209 POU (SCE, PG&E) | Income-qualified customers of city-owned utilities assigned to SCE or PG&E | $1.10/Wh + $3.10/W solar | Open |
Sources: SGIP Program Metrics (status as of October 2, 2026) · SGIP 2026 Handbook (rates, eligibility, application deadline). Status changes as funds move; check the live page before counting on any of it.
For a household that qualifies and gets funded, $1.10 per watt-hour comes to $14,850 for a 13.5 kWh battery — most of the $16,200 median above; an incentive can never exceed the project’s eligible cost. The general-market rate at its last step, $0.15 per watt-hour, came to about $2,000 for the same battery. The federal credit is gone too: expenditures after December 31, 2025 do not qualify for the 30% Residential Clean Energy Credit, so a battery completed in 2026 earns none (IRS; what the credit’s end means). The tiers in detail are in our SGIP guide.
SGIP was not closed to Los Angeles
Ratepayer-funded SGIP was open to customers of PG&E, SCE, SDG&E or SoCalGas for electricity or gas, so until those budgets closed, LADWP customers who buy gas from SoCalGas applied through SoCalGas — the program’s records list 2,367 paid projects at sites served by LADWP. LADWP also administers $32.4 million of the state-funded RSSE money for income-qualified customers. On October 2, 2026 that budget was on a waitlist, and LADWP says it cannot guarantee an incentive to anyone on it (LADWP). Its other programs are in LADWP solar and battery incentives.
Where to go next
This page is the price. Whether a battery pays for itself on your rate is in do I need a battery under NEM 3.0, and which one to buy in Powerwall vs Enphase vs FranklinWH. Cali Energy is a licensed Los Angeles solar, battery and electrical contractor (CSLB #1032379). Prices above are published data, not a quote; a site visit sets your number. Call +1-323-844-7777 or ask for an itemized battery quote.
Frequently asked
How much does a home battery cost in California in 2026?
In California’s SGIP records, completed single-battery projects of about 13 kWh had a median reported cost of $16,200 before incentives, and a quarter reported more than $19,000. NREL’s model puts a 13.5 kWh battery installed with new solar at about $13,100. These are published data, not a quote.
How much does a Tesla Powerwall cost in California?
In California’s SGIP records, completed Tesla home-battery projects from 2023–2025 reported a median installed cost of $18,200 before incentives, at a median size of 13.2 kWh — about one Powerwall. The middle half ran from $14,000 to $27,900, the upper end including two-battery systems.
How much do two home batteries cost?
In SGIP records, completed systems of 25–30 kWh — usually two whole-home batteries — had a median reported cost of $28,800, against $16,200 for one. It is less than double because the design, permit, gateway and crew visit are paid once.
How much does it cost to add a battery to existing solar?
No public dataset isolates the retrofit premium: SGIP records whether a site has solar, not when the battery was added, and its medians include both kinds of project. On top of the battery, an existing system may add a separate permit and interconnection review and, on an older home, main-panel work, each as its own line in the quote.
Is SGIP still available for home batteries in 2026?
Only for income-qualified households. The ratepayer-funded budgets, including the general-market rebate, took their last applications on December 30, 2025. The state-funded RSSE budget pays $1.10 per watt-hour; on October 2, 2026 its category for customers of city-owned utilities was open with SCE and PG&E, and the others were waitlisted or closed. Check the live SGIP metrics before counting on it.
Can LADWP customers get SGIP?
Many did. Ratepayer-funded SGIP was open to customers of PG&E, SCE, SDG&E or SoCalGas for electricity or gas, so LADWP customers with SoCalGas gas service applied through SoCalGas until those budgets closed at the end of 2025. Today the route is LADWP’s own $32.4 million of income-qualified RSSE funding, which was on a waitlist on October 2, 2026.
Is there still a federal tax credit for home batteries in 2026?
No. Expenditures after December 31, 2025 do not qualify for the 30% Residential Clean Energy Credit, so a battery completed in 2026 earns no federal credit. This is general information, not tax advice.
Why do battery quotes vary so much?
Installer pricing and financing. When the CPUC reviewed income-qualified SGIP applications in early 2026, developers had reported $8,600 to $21,000 for the same Tesla Powerwall 3 equipment. Ask for the battery as its own line at the cash price, divide by its kWh and compare it with the published medians.
Related reading
Sources & methodology
Figures on this page come from the primary sources below and, where noted, from Cali Energy calculations using the stated assumptions. Rates, incentives, and program terms change; each was verified October 5, 2026.
- SGIP — Weekly Statewide Report, project-level data (September 27, 2026)
- SGIP — Program Metrics, budget and step status (checked October 2, 2026)
- SGIP — 2026 Handbook (V3): eligibility, total eligible project cost, incentive rates, AB 209 allocations
- CPUC — Assigned Commissioner’s Ruling on verification of SGIP total eligible project cost, R.20-05-012 (February 20, 2026)
- NREL / U.S. Department of Energy — Solar Photovoltaic System Cost Benchmarks (Q1 2025)
- Berkeley Lab — Distributed Solar & Storage: 2025 Data Update
- LADWP — Self-Generation Incentive Program
- Consumer Financial Protection Bureau — Issue Spotlight: Solar Financing (Aug 2024)
- IRS — Residential Clean Energy Credit
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Get a free estimatePrepared by Cali Energy, October 5, 2026. This article is for general educational purposes only and is not legal, tax, financial, engineering, or utility advice. Rates, incentives, codes, permit requirements, equipment specifications, prices, and program terms may change; figures and timelines are estimates, not guarantees. Confirm current requirements with the applicable utility, AHJ, program administrator, manufacturer, or a licensed professional. See our Content Disclaimer. Cali Energy · 19201 Parthenia St, Unit E, Northridge, CA 91324 · CSLB #1032379 (B, C-10, C-39)