PG&E Solar Calculator
Estimate your savings with solar under California’s NEM 3.0 Net Billing Tariff.
What is a PG&E Solar Calculator?
A pg&e solar calculator is a specialized tool designed to help Pacific Gas & Electric (PG&E) customers in California estimate the financial viability of installing a home solar panel system. Unlike generic solar calculators, a PG&E-specific tool accounts for local electricity rates, California’s abundant sunshine, and most importantly, the Net Billing Tariff (NBT), also known as NEM 3.0. This policy, which went into effect in April 2023, fundamentally changed how solar owners are compensated for the excess energy they send to the grid. This makes a dedicated pg&e solar calculator essential for obtaining a realistic savings projection.
PG&E Solar Savings Formula and Explanation
Calculating solar savings with PG&E under NEM 3.0 is more complex than a simple 1-to-1 offset. The core idea is to determine your net cost after incentives and divide it by your estimated annual savings.
Payback Period Formula: Payback Period (Years) = (Total System Cost - Federal ITC) / Annual Solar Savings
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Average Monthly Bill | Your current spending on electricity. | $ (USD) | $100 – $600 |
| System Cost per Watt | The installed cost of the solar system before incentives. | $ / Watt | $2.50 – $3.50 |
| Federal ITC | The Investment Tax Credit, currently 30% of system cost. | % | 30% |
| Annual Solar Production | Total energy your system generates in a year. | kWh | 4,000 – 15,000+ |
| PG&E Export Rate | The reduced rate PG&E pays for your excess solar energy. | $ / kWh | ~$0.05 – $0.10 (average) |
Thinking about your return on investment? A California solar payback period is a critical metric to understand.
Practical Examples
Example 1: Moderate Electricity User
- Inputs: Average Monthly Bill: $200, Sunlight Hours: 5.5, Cost per Watt: $3.10
- Results: Our pg&e solar calculator might estimate a 6.2 kW system. The payback period would likely be around 9-11 years, with over $35,000 in savings over 25 years.
Example 2: High Electricity User
- Inputs: Average Monthly Bill: $450, Sunlight Hours: 5.8, Cost per Watt: $2.90
- Results: This scenario would require a larger system, perhaps 11.5 kW. The payback period could be shorter, potentially 7-9 years, due to offsetting a much higher bill. The 25-year savings could exceed $80,000.
How to Use This PG&E Solar Calculator
- Enter Your Average Bill: Find your average monthly electricity cost from your PG&E statements. This is the most critical input for estimating your usage.
- Adjust Sunlight Hours: While we provide a default, you can adjust this. Coastal areas might have fewer hours than inland areas like Fresno or Bakersfield.
- Set System Cost: We default to a current average cost per watt in California. If you have a specific quote from an installer, you can enter it here for better accuracy.
- Calculate and Review: Click “Calculate Savings” to see your results. The calculator will show your estimated payback period, system size, and monthly and long-term savings. The chart and table provide a deeper look at your financial returns.
For a deeper dive into the new rates, see our guide on NEM 3.0 explained.
Key Factors That Affect PG&E Solar Savings
- Your Electricity Consumption: The more electricity you use, the more you stand to save. High-tier rates are expensive, making solar more attractive.
- Time of Energy Use: Under NEM 3.0, using your solar power as it’s generated (self-consumption) is far more valuable than exporting it. Shifting appliance use (like laundry or EV charging) to daytime hours maximizes savings.
- Battery Storage: Adding a battery has become almost essential under NEM 3.0. It allows you to store cheap solar energy from the day and use it during evening peak hours when PG&E’s rates are highest, instead of selling it for low export credits.
- System Cost: The final installed price of your system directly impacts your payback period. Getting multiple quotes is crucial.
- Federal & Local Incentives: The 30% Federal ITC is the biggest incentive, drastically reducing the net cost of your system.
- Shading and Roof Orientation: A south-facing roof with minimal shade is ideal. Our pg&e solar calculator assumes good, but not perfect, conditions.
A electricity usage calculator can help you understand your consumption patterns better.
Frequently Asked Questions (FAQ)
1. Is solar still worth it with PG&E under NEM 3.0?
Yes, but the payback period is longer than under the old NEM 2.0 rules. For many, it’s still a strong long-term investment, especially when paired with a battery. The key is to focus on self-consumption rather than earning export credits.
2. How accurate is this pg&e solar calculator?
It provides a strong, data-driven estimate based on current rates and costs. However, it’s a simplified model. A professional installer’s proposal using specialized software will provide the most precise projection, accounting for your specific roof and detailed usage patterns.
3. Why are export rates so much lower with NEM 3.0?
The new rates are based on the “Avoided Cost” for the utility, which is the wholesale cost of energy. It’s much lower than the retail rate charged to customers, which includes costs for grid maintenance, transmission, and other utility operations. The goal was to reduce the subsidy that non-solar customers effectively paid for solar owners.
4. Do I need a battery with my solar system?
While not technically required, a battery is highly recommended for PG&E customers under NEM 3.0. It allows you to store your excess solar power for use during expensive peak hours in the evening, maximizing your savings and energy independence.
5. What size solar system do I need?
The system size depends on your annual electricity consumption. Our pg&e solar calculator estimates a size designed to offset a significant portion of your bill. An installer will typically analyze your hourly usage data to recommend a precise size.
6. How does the Federal Solar Tax Credit work?
The Investment Tax Credit (ITC) allows you to deduct 30% of your total system cost from your federal taxes. It is a credit, not a refund, meaning it reduces the amount of tax you owe.
7. What happens to my PG&E bill after I get solar?
You will still receive a monthly bill from PG&E. It will show your connection fees (around $15/month), any energy you imported from the grid, and any credits you received for exported energy. The goal is to make the net cost of this bill as close to zero as possible.
8. How long do solar panels last?
Most solar panels come with a 25-year performance warranty. They will likely continue producing power for 30 years or more, with a gradual decline in output over time.
Related Solar & Energy Resources
- Solar Panel Maintenance Guide – Learn how to keep your system running efficiently.
- California Solar Incentives – A comprehensive list of state and local rebates.
- Home Electricity Usage Calculator – Analyze your consumption before going solar.
- Best Solar Inverters Review – Understand the different types of inverters for your system.
- Understanding PG&E’s NEM 3.0 – A detailed guide to the new net billing tariff.
- PG&E Rate Plans Explained – Choose the best time-of-use plan for your solar home.