The San Mateo County panel upgrade rebate is one of the most misunderstood incentives on the Peninsula, mostly because it does not work the way people expect. Homeowners hear there is money available for a new electrical panel, call around for quotes, and then learn the rebate only applies when the panel work is tied to a heat pump project. If you are weighing a heat pump water heater or a heat pump HVAC system, this guide explains how the panel rebate actually works in 2026, when you truly need more electrical capacity, and how to avoid paying for an upgrade you do not need.
Our electricians work in homes across the county, from postwar tracts in San Mateo and Belmont to older bungalows in Burlingame and Redwood City. The same question comes up in almost every one of them: can this panel handle an all-electric appliance? The honest answer depends on your house, not on a rule of thumb.
Key Takeaways
- WestLight Energy, formerly Peninsula Clean Energy, offers a $1,000 bonus rebate for qualifying panel upgrades.
- The panel bonus must be claimed alongside a heat pump water heater or HVAC rebate.
- A heat pump water heater replacing gas can earn up to $4,000 through October 31.
- Circuit-sharing devices qualify for up to $500 and may let you skip a panel upgrade.
- Rebate applications must be submitted within 90 days of the installation completion date.
- The federal 25C tax credit ended for heat pump installs placed in service after 2025.
- A load calculation, not the panel’s age alone, should decide whether you need more amps.
What the San Mateo County Panel Upgrade Rebate Covers in 2026
The first thing to know is that the agency behind the rebate has a new name. Peninsula Clean Energy, the public agency that supplies electricity to San Mateo County, began operating as WestLight Energy on July 1, 2026. The agency said services and benefits did not change with the name, so older articles and contractor quotes that mention Peninsula Clean Energy rebates are referring to the same programs you will now find under the WestLight Energy name.
According to the WestLight Energy home upgrade rebate page as of September 2026, the main offers look like this:
- Heat pump water heater replacing a gas water heater: up to $4,000 for qualifying installations completed between September 1 and October 31, 2026, as a limited-time offer.
- Heat pump water heater replacing an electric resistance water heater: $500.
- Heat pump HVAC replacing a gas furnace or heater: $1,500 per condensing unit.
- Electrical panel upgrade bonus: $1,000, limited to one per electric account.
- Income-qualified bonus for CARE and FERA customers: an additional $1,000 per heat pump rebate, up to a stated maximum.
These numbers change. The rebate levels were different earlier in 2026, and the limited-time water heater amount has a firm end date. Treat any figure you read here, or in a contractor’s proposal, as something to confirm on the program page before your project starts.
Why the Panel Bonus Only Works With a Heat Pump Project
This is where most confusion starts. The panel money is not a standalone rebate for anyone who wants a new panel. Under the program terms and conditions updated May 18, 2026, the panel upgrade rebate is applied for at the same time as a heat pump water heater or heat pump HVAC application. In plain terms, the panel bonus rides along with a heat pump rebate. It does not replace one.
That design makes sense once you see the goal. The program exists to help homes move from gas appliances to electric ones. A panel upgrade that does not support that switch, such as a new panel for a kitchen remodel or a hot tub, falls outside the program even if the work is useful for your home.
A few other conditions are worth knowing before you plan around the money:
- You need to be an active WestLight Energy customer and the legal owner of the property.
- The panel bonus is limited to one per electric account, so a second panel project later will not qualify again.
- The rebate application has a deadline measured from the day the work is finished, which we cover in the step-by-step section below.
Do You Actually Need a Panel Upgrade for a Heat Pump?
A lot of San Mateo County homes do not. That surprises people, especially owners of houses with 100 amp service who assume anything electric will push them over the edge. WestLight Energy itself publishes guidance on adding electric appliances without upgrading your panel, because avoiding an unnecessary upgrade saves money and time for everyone involved.
Whether you need more capacity comes down to three things: the appliance you choose, how your existing loads add up, and how many open breaker spaces your panel has.
240-volt vs 120-volt heat pump water heaters
Most full-size heat pump water heaters run on 240 volts and need a dedicated circuit, often the same size an electric resistance water heater would use. If your home already has a gas water heater, that circuit usually does not exist yet, so it has to be added to the panel.
There is also a newer class of 120-volt heat pump water heaters designed to plug into a standard outlet near the existing water heater location. They recover hot water more slowly than 240-volt models, which matters for larger households, but they can make the difference between keeping your current panel and replacing it. We walk through that tradeoff with homeowners before any quote is written, because the right unit depends on how your family uses hot water.
A load calculation, not guesswork
The electrical code gives electricians a structured way to answer the capacity question for an existing home. One method adds up the connected loads in the house using standard factors. Another uses a year of actual demand data from your utility meter to show the peak your home really reaches. Either approach is far more reliable than looking at the number printed on the main breaker and guessing.
This is also the step where a good contractor earns your trust. A proposal that jumps straight to a 200 amp upgrade without showing the math should raise a question. Sometimes the upgrade is truly needed. Other times the calculation shows plenty of room, and the job becomes a single new circuit.
Circuit-sharing and load management devices
If your panel is close to its limit, a circuit-sharing or smart load management device can let two large appliances take turns on one circuit. A common example is a water heater and an EV charger that rarely need full power at the same moment. WestLight Energy offers a rebate of up to $500 for eligible smart power management devices, with up to two per household, according to its panel guidance page.
These devices are not a fit for every home. They work best when the two loads truly do not overlap much, and they still require a licensed installation. But for a house that is only slightly short on capacity, they can be the cheapest route to going electric.
As the comparison shows, the panel bonus is only one of three possible outcomes. The best path is the one your load calculation supports, and the rebate should follow that decision rather than drive it.
How San Mateo County Homes Shape the Panel Decision
The county’s housing stock makes the capacity question more interesting than in newer suburbs. Large parts of San Mateo, Belmont, San Carlos, and Redwood City were built in the decades after World War II, when a typical home ran lighting, a refrigerator, and maybe one or two larger appliances. Many of those houses still have their original service size, or a panel that was replaced at the same amperage decades ago.
Across our calls on the Peninsula, a few patterns come up again and again:
- Panels that are full rather than overloaded. The home may have enough total capacity, but every breaker space is already used, so there is physically nowhere to add a circuit without rework or a new panel.
- Tandem breakers and past additions. Earlier remodels sometimes squeezed extra circuits into panels in ways that should be checked before anything else is added.
- Gas appliances bunched together. Homes that started with a gas range, gas dryer, gas furnace, and gas water heater have the most to gain from a careful plan, because converting everything at once can add up faster than converting one appliance.
- Mid-century modern homes with unusual layouts. San Mateo’s Highlands neighborhood holds a large number of Eichler homes, where slab construction and limited attic space change how new wiring gets routed.
None of these automatically means you need an upgrade. They mean the evaluation should look at the panel itself, not just the math. A panel with space and a sound bus can often take a new heat pump circuit. A panel that is full, damaged, or from a brand with a poor track record is a different conversation, and that is when our electrical panel upgrade service becomes the right tool.
“Before anyone sells you a new panel for a heat pump water heater, ask to see the load calculation. Sometimes the right answer really is a bigger panel, but sometimes a smarter circuit plan gets you to the same place for a lot less money.”
Victor, Local Trusted Electricians
Step by Step: How the Rebate and the Upgrade Fit Together
When a panel upgrade is part of a heat pump project, the order of operations matters. Doing things out of sequence is the most common way homeowners lose money they expected to receive.
- Eligibility review. Confirm you are an active WestLight Energy customer, that you own the home, and which rebates apply to your specific equipment. Check the current amounts at this stage, since limited-time offers expire.
- Load calculation and equipment choice. Decide on the heat pump model and confirm whether the existing panel, a circuit-sharing device, or a new panel is the right electrical path.
- Permits. Your city issues the electrical permit. The rebate application asks for a copy of the permit, and the permit description needs to name the upgrade the rebate covers, so make sure the panel work and the heat pump work are both described clearly.
- Installation and inspection. The panel and heat pump circuits are installed, and the city inspector signs off. If the work changes your electrical service, PG&E scheduling becomes part of the timeline.
- Documentation. The application asks for photos, including a photo of the inside of the new panel, plus proof that the old gas equipment was removed or the gas line was capped.
- Application. Submit the rebate application within 90 days of the installation completion date, as the program terms require. Missing that window is an easy way to forfeit the money.
We help homeowners keep the paperwork organized through each of these steps, including the photos and permit details the program asks for. We cannot promise any rebate amount, since the program sets the rules and funding can change, but we can make sure the electrical side of your file is complete.
What the Rebate Does Not Cover
Knowing the limits is just as useful as knowing the amounts. A few common assumptions do not hold up in 2026.
The federal tax credit is gone for new installs
For several years, homeowners could stack local rebates with the federal Energy Efficient Home Improvement Credit, often called 25C. That option has closed. As Rewiring America explains, the credit expired for qualifying heat pump water heater installations after December 31, 2025. Work completed in 2026 does not qualify, so local programs like WestLight Energy’s are now the main source of incentive money for Peninsula homeowners.
A panel upgrade on its own
As covered above, a new panel without a qualifying heat pump project does not earn the panel bonus. If your main reason for an upgrade is an EV charger, a remodel, or a pool, plan the budget without that rebate.
Every part of the job
Rebates are capped, and they are generally tied to installed cost of the qualifying upgrade. Related work such as drywall repair, relocating equipment for convenience, or unrelated circuits added at the same time may not count. Ask for an itemized proposal so you can see which lines connect to the rebate and which do not.
What Drives the Cost of a Panel Upgrade in San Mateo County
We avoid quoting a single price range for panel work, because the spread between a simple job and a complex one is wide. Instead, it helps to understand the factors that move the number.
- Same-size replacement vs service upgrade. Replacing a panel at the same amperage keeps the utility side mostly unchanged. Increasing your service size usually involves PG&E, new service conductors, and sometimes a new meter location.
- Overhead vs underground service. Homes fed by underground lines can involve more work and coordination when the service size changes.
- Panel location. A panel on an exterior wall is simpler than one buried inside a finished wall or a tight closet that has to be enlarged.
- Code updates triggered by the work. Replacing a service panel brings parts of the system up to the current electrical code, including requirements such as an outdoor emergency disconnect and updated grounding and bonding.
- Circuits added at the same time. A heat pump water heater, a heat pump HVAC system, and an EV charger each need their own planning. Adding them together is usually more efficient than coming back later.
The best way to control cost is to plan the whole electrification path at once. If an EV is likely in the next few years, it is worth discussing a home EV charger installation during the same load calculation, even if the charger comes later. For homes where the main panel location is inconvenient, a subpanel installation near the new equipment can sometimes simplify the wiring.
Why Heat Pump Water Heaters Are Worth the Electrical Planning
It is fair to ask whether all of this planning pays off. WestLight Energy’s water heating upgrade page states that heat pump water heaters are at least three times more efficient than natural gas water heaters, and it estimates a household can save $1,000 to $3,000 over the life of the water heater compared with gas. The same page notes that some homes may need a panel upgrade, but generally will not need to increase their electrical service with PG&E.
That last point matches what we see. The expensive surprise is usually not the panel itself but a service upgrade that was not needed. A careful plan at the start keeps the project on the lower-cost side whenever the house allows it.
How to Choose an Electrician for a Rebate-Linked Project
Because the panel bonus depends on paperwork, the contractor you choose affects more than the quality of the wiring. Look for these basics:
- A California C-10 electrical contractor license, which you can verify with the Contractors State License Board.
- A written load calculation or a clear explanation of how capacity was determined.
- A permit pulled in your city, with a description that names the panel and heat pump work.
- Familiarity with the documentation the rebate program asks for, including photos taken before the panel cover goes back on.
- An itemized proposal that separates the rebate-eligible work from anything else.
Programs sometimes add or change contractor requirements, so confirm at the time you apply whether the program expects work by a participating contractor. If you are unsure whether your existing wiring is in good enough shape to support new loads, an electrical safety inspection before the project begins can catch problems that would otherwise surface halfway through the job.
Planning Your Next Step
The panel rebate is a helpful piece of the puzzle, but it works best as a bonus on a project that already makes sense for your home. Start with the heat pump you want, run an honest load calculation, and let that decide whether you keep your panel, add a circuit-sharing device, or upgrade. If the numbers point to a new panel, time the work so the rebate paperwork lines up with the heat pump installation and the 90-day application window.
If you live on the Peninsula and want a straight answer about your panel, our team at Local Trusted Electricians in San Mateo can review your current setup, explain your options in plain language, and help you plan the electrical side of your switch to all-electric appliances.
