PG&E Solar Calculator
Estimate Savings & Payback under NEM 3.0 NBT Rules
Estimated Payback Period
Monthly Bill Comparison
■ Post-Solar
Visualizing your monthly bill reduction after pg&e solar calculator estimation.
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What is the PG&E Solar Calculator?
The pg&e solar calculator is a specialized financial modeling tool designed for California homeowners served by Pacific Gas & Electric. With the transition to NEM 3.0 (Net Billing Tariff), calculating the return on investment for solar panels has become significantly more complex than the previous “one-to-one” credit system.
Who should use this? Anyone residing in Northern or Central California considering solar. A common misconception is that solar no longer makes sense under NEM 3.0. While the export rates are lower, the pg&e solar calculator demonstrates that when paired with battery storage, the financial benefits remain substantial due to PG&E’s high retail electricity rates.
PG&E Solar Calculator Formula and Mathematical Explanation
To provide an accurate estimate, our tool uses a multi-step derivation that accounts for production, consumption offset, and the “Self-Consumption Ratio.”
The core formula used in the pg&e solar calculator is:
Annual Savings = (Solar Production × Self-Consumption % × Retail Rate) + (Solar Production × Export % × Avoided Cost Rate)
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| System Size | Total DC capacity of panels | kW | 4 – 12 kW |
| Retail Rate | Cost to buy power from PG&E | $/kWh | $0.42 – $0.58 |
| Avoided Cost | Value of exported energy (NEM 3.0) | $/kWh | $0.05 – $0.08 |
| Self-Consumption | Energy used directly by home | % | 30% (No Battery) – 90% (Battery) |
Explore Related Solar Resources
- NEM 3.0 Net Billing Guide: Understand the shift from NEM 2.0 to NEM 3.0.
- Solar Battery Storage Costs: Compare the top battery brands for PG&E customers.
- California Solar Incentives: Local rebates and programs for 2024.
- Solar Panel Degradation Rates: How performance changes over 25 years.
- Federal Solar Tax Credit (ITC): How to claim your 30% credit.
- Solar Financing Comparison: Loans vs. Leases vs. Cash purchase.
Practical Examples (Real-World Use Cases)
Example 1: The Suburban Home (Standard Setup)
Inputs: $300 monthly bill, 7kW system, 10kWh battery. Using the pg&e solar calculator, we see a net cost of approximately $17,150 after the tax credit. The annual savings reach $2,800, leading to a payback period of 6.1 years. This illustrates how batteries mitigate the lower export rates of NEM 3.0.
Example 2: The Large Estate (High Energy User)
Inputs: $600 monthly bill, 12kW system, 20kWh battery. In this case, the pg&e solar calculator predicts massive savings. Because the homeowner is in a higher tiered rate or expensive TOU (Time of Use) period, the annual savings exceed $6,500, resulting in a payback period of just 5.4 years.
How to Use This PG&E Solar Calculator
- Enter Monthly Bill: Input your average bill across all 12 months.
- Set System Size: Use 1kW for every $40-$50 of your monthly bill as a starting point.
- Choose Battery: Under NEM 3.0, select at least a 10kWh battery to see realistic savings.
- Review Results: The pg&e solar calculator will instantly show your payback years and 25-year total savings.
Key Factors That Affect PG&E Solar Calculator Results
- NEM 3.0 Export Rates: Unlike NEM 2.0, you are not credited at the full retail rate for excess power. The pg&e solar calculator uses the ACC (Avoided Cost Calculator) values.
- Utility Rate Inflation: PG&E rates historically rise by 4-6% annually. This makes solar more valuable over time.
- Time of Use (TOU): When you use power matters. Solar saves you most when it prevents you from buying peak power (typically 4 PM to 9 PM).
- System Orientation: South-facing panels produce more total energy, but West-facing panels might offset more high-cost evening energy.
- Battery Cycling: A battery allows you to store solar power for use during the 4 PM – 9 PM peak, maximizing your pg&e solar calculator results.
- Federal Tax Credit: The 30% Investment Tax Credit (ITC) is the biggest factor in reducing initial system cost.
Frequently Asked Questions (FAQ)
Is solar still worth it with PG&E under NEM 3.0?
Yes, solar is still worth it, but the pg&e solar calculator shows that the economics now strongly favor adding a battery. Without a battery, your payback period might extend to 10+ years; with a battery, it stays around 6-8 years.
What is the “True-Up” bill?
The True-Up is an annual statement from PG&E that reconciles all the energy charges and credits over a 12-month period. Our pg&e solar calculator estimates this net annual balance.
How does battery storage change my pg&e solar calculator results?
A battery stores excess midday solar energy and uses it at night. This prevents you from exporting energy to PG&E at low rates (~$0.05) and buying it back at high rates (~$0.50).
What is the average cost of solar panels in California?
Most systems cost between $3.00 and $4.00 per watt installed before incentives. The pg&e solar calculator defaults to $3.50 as a conservative market average.
Can I go off-grid with PG&E?
While possible, it is extremely expensive. Most users remain grid-tied to use PG&E as a backup, even if they use a pg&e solar calculator to minimize their bill to near zero.
Does solar increase my property taxes in California?
No, California has a property tax exclusion for solar energy systems, meaning the value added to your home is not taxed.
What happens to my solar if the power goes out?
Without a battery, your solar system will shut down during a blackout for safety reasons. With a battery, you can have “islanding” capabilities to keep your lights on.
How long do solar panels last?
Most panels are warrantied for 25 years but can continue producing power for 30-40 years, albeit at a slightly lower efficiency each year.