Cost
$0 upfront
No battery purchase and no monthly hardware payment for eligible homes. DuoPower keeps ownership and service responsibility.
California Energy Reserve Program (CERP)
A managed home battery without buying one.
CERP lets eligible California homeowners host an 80 kWh DuoBox battery operated by DuoPower. Your home gets a backup reserve, potential TOU bill savings, and fixed CERP payments while the extra capacity supports California's local grid needs.
Review the program rules, control terms, and home-specific estimate before deciding.
$0Upfront hardware cost for eligible homes
80 kWhManaged home battery capacity
$262-$1.4kEstimated annual TOU bill-savings range
$120/yrFixed CERP payment paid to homeowner
CERP first
What CERP means.
CERP means California Energy Reserve Program. The model is simple: qualified homes host a DuoBox battery, DuoPower owns and operates it, and the home receives backup and financial benefits under program rules.
You hostDuoBox is installed at your home if the site qualifies and you accept the final terms.
We operateDuoPower owns, maintains, monitors, and dispatches the system under CERP rules.
You benefitYour home receives a backup reserve, estimated TOU savings, and a fixed annual CERP payment.
Grid valueThe grid receives dispatchable residential capacity during contracted windows.
Backup
80 kWh
Designed for meaningful backup. Runtime depends on actual load: whole-home use may be hours; essential-load use can stretch much longer.
Bills
$262-$1,400
Estimated annual TOU bill-savings range before a home-specific calculation. Savings are shown separately from CERP payments.
Grid
17.7 kW
Base grid-capacity contribution per DuoBox node during contracted dispatch windows, while preserving a backup reserve for the home.
Meet DuoBox
DuoBox, installed at home.
A large managed battery that keeps home backup reserve while supporting local grid capacity through CERP.
79.8 kWhNameplate energy
24 kW / 100AWhole-home power support
4.8 daysAvg. CA home consumption
Flexible placementSide yard, backyard, detached garage, or eligible garage location
Quiet operationNo engine, fumes, or fuel storage
Safety listedUL 9540, UL 9540A, UL 1741-SA, IEEE 1547, CA Rule 21, and California Energy Commission equipment listing
Quick fit check
Who this is likely for.
CERP is built for homeowners who want a practical outcome: no battery purchase, meaningful backup, visible bill-savings assumptions, and a single program path instead of several installer and financing quotes.
Likely fit.
+You want meaningful backup without buying a battery.
+You want a home-specific estimate before deciding.
+You are skeptical that a $12,000-$30,000 battery pays for itself.
+You are comfortable with managed operation under clear rules.
Less likely fit.
-You want to own the equipment outright.
-You want full control over every battery setting and dispatch decision.
-You are not comfortable hosting equipment owned by DuoPower.
-You do not want a managed CERP grid-service model.
Compare
Compare the financial path.
Buying a Powerwall can make sense if ownership and full control matter most. CERP is different: DuoPower owns and manages the larger battery, while the homeowner evaluates backup, bill savings, and payments without a battery purchase.
Swipe to compare options.
| Question | DuoPower CERP | Tesla Powerwall 3 purchase | Tesla lease example |
|---|---|---|---|
| Upfront cost | $0 for eligible homes | ~$12,000-$16,000+ depending on quote/site | $100 upfront in one example |
| Monthly hardware payment | $0 | $0 after purchase | $97/mo + 3% annual escalator in one quote |
| Battery size | 80 kWh | 13.5 kWh | 13.5 kWh |
| Ownership | DuoPower owns and maintains it | Homeowner owns it | Tesla owns it |
| Control | Shared under CERP rules | Full homeowner control | Lease terms apply |
| Annual cash received | $120/year paid to homeowner | None | None |
| 10-year modeled value | +$7,600 estimate | -$4,046 estimate | Depends on final lease terms |
Backup math
Use your bill to estimate backup duration.
EIA's 2024 California residential average is 503 kWh per month, about 16.5 kWh per day. At that pace, 78.8 kWh of usable energy is roughly 4.8 average days.
7-8 days~300 kWh/month efficient or light-use home
~4.8 days503 kWh/month California residential average
2.5-3 days~900 kWh/month larger or electrified home
8-13 hrs6-10 kW active comfort loads: HVAC, cooking, laundry, heavy appliances
Find your lane on the electric bill: monthly kWh / 30 = daily use; 78.8 / daily use = backup days. Source: EIA 2024 residential table. Solar homes may show lower grid kWh than total home load.
Why 80 kWh matters
A home battery sized for backup and grid reserve.
Most home batteries are sized around household backup. DuoBox is larger by design: part of the capacity protects the home, and the remaining capacity can be dispatched as local grid reserve under clear CERP rules.
01
Reserve first.
A backup floor is preserved so normal grid dispatch does not leave the home empty during an outage.
02
Capacity second.
Excess energy and power become dispatchable capacity for local CCA and grid-service needs.
03
Managed rules.
Operation is controlled by DuoPower under program terms, with homeowner benefits stated before installation.
04
Clear estimate.
The home-specific estimate separates bill savings, CERP payments, backup assumptions, and ownership terms.
Estimate
Estimate bill savings and CERP interest separately.
Use the calculator to understand possible annual bill savings. Use the separate CERP interest form only if you want your household counted as interested in the California Energy Reserve Program.
Before you sign
Questions to resolve before signing.
What does $0 upfront mean?
$0 upfront for eligible homeowners. The tradeoff is ownership and operation: DuoPower owns, monitors, maintains, and dispatches the battery under CERP rules.
Who controls operation?
DuoPower manages grid-service operation. The homeowner receives backup and CERP benefits, including a reserved backup floor during normal grid dispatch.
Do I need solar?
No. Solar may improve bill optimization, but CERP can be evaluated for homes without solar.
Can the system be removed?
Yes. DuoBox is designed as modular equipment owned by DuoPower. Removal or transfer terms should be reviewed in the final program agreement.
Can backup last a week?
Not under normal whole-home use. Multi-day backup requires essential-load or rationed emergency use.
What happens next?
Use a recent electric bill to request your home-specific estimate. Review the assumptions before installation.
See how CERP could work for your home.
Use a recent electric bill to estimate potential bill savings, backup duration, CERP payments, and ownership terms before you decide.
Request estimate