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Is Solar Worth It in Foster City, California?

We analyzed Pacific Gas & Electric (PG&E) rate books, NREL irradiance data, and California tax codes to calculate the real ROI for homeowners in 94404.

Market Snapshot

Elec. Rate
$0.27/kWh
Sun Hours
5.75
Utility Pacific Gas & Electric (PG&E)
Tax Exempt Yes
Battery Required

Analyst Note: The "4kW Benchmark"

The analysis below uses a standardized 4kW system to provide a fair baseline comparison across cities. However, the average electric bill in Foster City is $148.5.

High PG&E bills are a fact of life for Foster City homeowners, especially with rates constantly on the rise. Since the rollout of Net Energy Metering (NEM) 3.0, the old way of selling solar power back to the grid for significant credits is over. This change has fundamentally shifted the math on solar, making one piece of equipment non-negotiable for real savings: a home battery.

Benchmark Cost Analysis

Solar + Battery System Costs in Foster City (2026)

While a solar-only setup appears cheaper at first glance (around $8,050 net), it offers minimal savings under NEM 3.0. The realistic path to energy independence involves a combined system. Here's a typical cost breakdown:

  • Gross System Cost (Solar + Battery): Approximately $23,500
  • Federal Solar Tax Credit (30%): -$7,050
  • Final Net Cost: $16,450

This investment has a payback period of around 9-10 years. After that, you're generating nearly free electricity for the next 15+ years, even with the Bay Area's coastal fog, often called the marine layer.

Incentives & Tax Credits

Available Solar Incentives

The primary financial incentive is the 30% Federal Residential Clean Energy Credit, which allows you to deduct $7,050 from your federal taxes on a $23,500 system. Additionally, California offers a full property tax exemption, meaning the significant value your solar system adds to your home won't increase your property taxes.

Net Metering: Pacific Gas & Electric (PG&E)

Policy Status

NEM 3.0 (2023)

Battery Priority

Critical 🔋

Understanding PG&E's NEM 3.0 Policy

Under NEM 3.0, PG&E pays you pennies for the extra solar power your system generates during the day—around 5-8 cents per kilowatt-hour. Just hours later, during peak evening hours from 4-9 PM, you're forced to buy that same electricity back for 30 cents or more. A solar-only system can't overcome this rate gap. The solution is to store your cheap, self-generated solar energy in a battery and use it to power your home when grid electricity is most expensive, effectively breaking free from peak pricing.

Projected Savings

Your Potential Monthly & Annual Savings

With a properly sized solar and battery system, you can slash your PG&E bill by 80-95%. By avoiding high-cost peak electricity, the typical Foster City household with a $150 monthly bill can achieve annual savings of around $1,673. Over the 25-year lifespan of the solar panels, that adds up to over $41,800 in avoided utility costs, insulating you from future PG&E rate hikes that are sure to come.

Local Questions Answered

Do solar panels still work with Foster City's coastal fog?
Yes, absolutely. Modern panels are highly efficient and produce significant power even on overcast or foggy days. California's coast provides more than enough annual sunlight for a system to eliminate your bill. Production is based on yearly averages, not daily weather.
Why is a battery required with PG&E's NEM 3.0?
Because PG&E now buys your excess solar power for a tiny fraction of what they charge you for electricity in the evening. Without a battery, you give away valuable energy for almost nothing. A battery lets you store and use your own energy, maximizing your savings.
What is the total payback period for a solar and battery system here?
For a standard system costing around $16,450 after the federal tax credit and saving you about $1,673 per year, the payback period is just under 10 years. With electricity rates rising, this timeline often shortens.

Calculate Your Solar Savings

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* Calculations based on Pacific Gas & Electric (PG&E) residential rates (0.27/kWh).

Data Transparency & Methodology

Estimates for Foster City, California are produced by the SunCents Solar Engine (v1.2). We combine the following verified or standard industry sources:

Performance (PV production)

NREL PVWatts — modeled annual and hourly AC output (kWh), solar radiation, and system losses for a standardized array size so cities can be compared fairly.

nrel.gov

Electricity rates (tariffs)

U.S. Energy Information Administration (EIA) — state-level average retail electricity prices ($/kWh) and supporting series for economic context.

eia.gov

Incentives & programs

DSIRE — state and local rebates, net metering, and policy programs (summarized for readability; always confirm eligibility with a tax or solar professional).

dsireusa.org

Federal tax credit (ITC)

Investment Tax Credit — federal residential solar credit (e.g. 30% of qualified costs where applicable); rules change with statute—verify with a qualified advisor.

energy.gov

Utilities & interconnection

Where shown, local utilities (e.g. APS, PG&E, FPL, and other IOUs or munis) are mapped from public interconnection, tariff, or service-territory references so net metering and rider rules match your area—not generic national averages.