Solar in Belvedere, CA

What net billing changed about the equipment decision

California changed how exported solar energy is credited. Customers who applied for interconnection after April 14, 2023 take service under the net billing tariff adopted in CPUC decision D.22-12-056. The California Public Utilities Commission states the core change plainly: compensation for excess generation exported to the grid is applied to the bill "at a rate reflecting the value of this generation to the grid."

The mechanism matters more than the label. Under the older arrangement, a kilowatt-hour sent out at noon offset one drawn at eight in the evening at roughly equal value, so the grid worked as a free battery. Under net billing, midday export is worth less than evening consumption, because midday is exactly when the grid needs energy least. PG&E's time-of-use periods put the highest prices in the late afternoon and evening, after the sun has dropped behind the Marin hills.

Two consequences follow, and they are why a design written today does not resemble one from 2018. Storage became the component that determines whether the system performs, because it lets you consume your own production during the expensive window instead of exporting it cheaply. And orientation turned into an economic question: a west-facing plane makes fewer annual kilowatt-hours than a south-facing one but makes them nearer peak pricing, which on Belvedere's hillside lots often turns a "bad" exposure into an acceptable one.

One more thing belongs in every conversation before outage season. A grid-tied array does not power your house when the grid is down. The inverter is required to disconnect so utility crews are not working on a line your roof is energizing. That is not a defect and not brand-specific. It is why a solar-only house sits dark alongside its neighbors when PG&E turns off power for safety during severe weather, which the Tiburon Peninsula is exposed to. Keeping circuits alive takes storage with a backup-capable inverter and a properly configured transfer point, or a standby generator. We are a Certified Generac Generator installer, so we can scope the alternative rather than pretend there is one answer.

Sizing: load first, roof second, storage third

Load first. We start from twelve months of actual interval usage, never a square-footage rule of thumb, and then ask what is changing. BAAQMD's zero-NOx rule for residential water heaters begins phasing in from 2027 with compliance dates that vary by unit size, and Belvedere sits fully inside the district. We confirm the current requirement at project time. A heat pump water heater adds electrical load, and an array sized before that conversion will be short after it.

Roof second. Usable area, not gross area. Setbacks, access and clearance pathways, obstructions and shade all subtract. On the cut-up roofs of the island streets, the usable fraction is often far smaller than a satellite estimate suggests.

Storage third. Capacity follows one question: whole-house backup, or a defined set of critical loads? Whole-house means a larger battery, a larger inverter and more electrical work. Critical loads covers refrigeration, some lighting, networking, and a circuit or two for medical devices. Most homeowners here land on critical loads once they see what each approach involves.

Permits, code and inspection in Belvedere

Belvedere publishes its own review tiers, and solar sits in an unusually specific spot inside them.

• State law caps local discretion. Government Code 65850.5 requires every city and county to adopt an ordinance "that creates an expedited, streamlined permitting process for small residential rooftop solar energy systems," and directs that "a city or county shall administratively approve applications... through the issuance of a building permit or similar nondiscretionary permit."
• Review is ministerial, with a narrow exception. A discretionary denial under that statute requires written findings of a "specific, adverse impact upon the public health or safety" with "no feasible method to satisfactorily mitigate or avoid" it. Aesthetic preference is not that finding.
• Cities must publish a checklist of the requirements a small rooftop system meets to qualify for expedited review.
• Belvedere puts solar without a battery in its staff-level tier. The City of Belvedere's published review levels list "Residential solar P.V. systems (not equipped with an ESS system)" as a Medium Project under Standard Staff Level Review, at a stated "+/- 10 days."
• Adding a battery moves you out of that tier. The carve-out is explicit in the city's own wording, and the staff-level category covers photovoltaic systems not equipped with an energy storage system. Plan on a longer multi-department review when storage is in scope. This is the single most useful thing to know before you set a schedule, and it runs opposite to what the economics push you toward.
• Deed restrictions have limited reach. California Civil Code 714 makes any covenant or condition that "effectively prohibits or restricts the installation or use of a solar energy system" void and unenforceable. A restriction survives only if it is reasonable, meaning it does not significantly raise cost or cut efficiency. Associations and local entities keep the right to enforce "applicable health and safety standards and requirements imposed by state and local permitting authorities."
• Interconnection is a separate approval. PG&E owns the wires and processes it regardless of who supplies your generation, and the system may not export until permission to operate is issued.
• Inspection focuses on electrical detail: disconnect location, conductor sizing, overcurrent protection, grounding and bonding, rapid shutdown function, and correct labeling at the main service. Peninsula addresses outside city limits are permitted through the Marin County Community Development Agency instead.

What drives the cost

Per-watt is the number that hides the most, so here is what actually moves a Belvedere quote.

The electrical service is usually the largest swing item. A main panel can accept only so much backfed current before the busbar rating is exceeded, and on the older streets we still find panels with no room for a solar breaker. That leaves three options: a supply-side connection ahead of the main breaker, a panel replacement, or a service upgrade with the utility involved. A proposal written without opening your panel cover cannot tell you which one you are buying.

Roof complexity comes second. Plane count, pitch, height above grade, covering material and underlayment condition all move labor. One large plane of composition shingle at moderate pitch is a different job from four small tile planes on a three-story hillside elevation at the same system size. Conduit distance belongs here too, since the run from array to inverter to service is long on vertical lots.

Storage carries its own structure: usable capacity, continuous and surge output, whole-house versus a critical-loads subpanel, and where the battery can be mounted safely and legally. It also changes your permit path and therefore your schedule. Access rounds it out, because a crew carrying material up a stepped entry from a lane with no parking spends hours that never appear on a spec sheet.

Incentives, and what is open

Solar incentive information goes stale faster than almost anything else online, so this is the state we verify at project time.

Storage has the live program. The Self-Generation Incentive Program, administered by the CPUC, supports behind-the-meter advanced energy storage and combined solar-and-storage systems. Its Residential Solar and Storage Equity incentives opened for reservation on June 2, 2025 and are described as available to any low-income residential electric or gas customer in California, alongside equity resiliency and small residential storage categories. Requirements include enrollment in a qualified demand response program.

MCE supplies your generation, PG&E remains your utility. Belvedere is served by MCE as its community choice electricity provider while PG&E delivers the power, reads the meter and handles interconnection. Which entity credits your exports, and on what terms, is worth confirming with MCE before you sign.

The rest of the solar work we do in town

New array installation is the core of it. Battery storage added to an existing array is the most common companion job, and the main panel and service work that a solar project triggers is handled by the same crew, since we hold the C-10 electrical license ourselves. Running all four trades from Petaluma means none of that needs a second contractor. Heat pump and HVAC work in Belvedere is the load side of the same equation, and plumbing in Belvedere, including heat pump water heater conversions on Marin Water supply, is where the coming air district rule lands first.

Belvedere Island, Corinthian Island and the lagoon

The three parts of town present three different jobs.

On Belvedere Island and Corinthian Island, houses are older, roofs are complex, lots are steep and access is the binding constraint. Original electrical services here were sized for homes carrying far fewer loads than a modern household runs, so a solar project frequently becomes a solar-and-service project. Design review culture is real in this part of Marin, which is precisely why the state statute limiting discretionary review of rooftop solar is worth understanding before you assume the answer is no.

Around the Belvedere lagoon, the mid-century houses tend to be lower, simpler in roof form and easier to stage. The trade-off is proximity to the water, putting hardware in the most corrosive air in town, plus garage and utility-space constraints that decide where a battery can go. Across all of it, exposure to power shutoffs is why storage conversations run shorter here than inland.

How to choose a solar contractor for this work

Four questions separate a proposal worth taking seriously from one worth discarding.

Did they open the electrical panel? A design that ignores service capacity and busbar rating is a guess, and the correction lands on you later. Did they measure shade on site across the year rather than from an aerial image? Belvedere's trees and hillside neighbors shade roofs that satellite tools call clear. Did they tell you what a battery does to your permit path in this specific city? An installer working from a generic California playbook will not know Belvedere separates the two.

And do they hold the electrical license themselves? Ask directly. When panel work is subcontracted, accountability for the finished system divides at the point where it matters most. Ongaro & Sons has been a family business since 1932, holds a BBB A+ Rating and Diamond Certified status, and the crew on your roof works for us.

What North Bay homeowners say

Two of the reviews behind our rating:

Solar across Belvedere and Marin County

Related work nearby: solar across Marin County, solar in Sausalito, solar in Mill Valley, solar in Corte Madera, and the full Belvedere service matrix covering every trade we run in town.