Solar Savings Calculator

Residential SDG&E Customers

Thinking about going solar? This solar calculator uses your electrical consumption data and the location of your residence to estimate how the addition of a solar photovoltaic (PV) system will affect your monthly and annual electricity bils.

Once you connect your solar PV system to the grid, you receive credit for electricity you provide to the grid – a system called net energy metering. Your electric rate structure also changes so that you are charged (or credited) differently depending on the time of day. Kilowatt-hours used (or produced) weekdays from 11am-6pm have a higher value than those used (or produced) at other times. This calculator also accounts for these time-of-use (TOU) rates now required for new residential solar installations - and provides a look at how a proposed rate change may affect future bills.

1. Enter your address

This will allow us to estimate solar production at your exact location.

2. Upload your greenbutton data (XML File)

Your Green Button data shows your energy consumption patterns over time. You can download it by accessing your SDG&E account. Instructions
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3. See your current consumption and potential solar production

4. Your estimated monthly bill with a solar PV system

Before estimating your electricity bills, please answer a few questions. First, enter your climate zone. If you don't know, check here or look at the Electric Service section of your SDG&E bill.

Second, how do you heat your home? If you have a natural gas-burning furnace or you’re not sure, select “natural gas”.

Finally, do you receive any discounts on your bill? Discounts available to SDG&E customers include the California Alternate Rates for Energy (CARE) Program and the Family Electric Rate Assistance (FERA) Program.

Total Annual Estimated Current Electric Bill: $-
Total Annual Estimated Electric Bill with Solar PV System: $-
Total Annual Electric Bill Savings: $-
Estimated Optimal System Capacity:

*Bill savings does not include the cost of purchasing or leasing the solar PV system.

You now have an estimate of how a solar PV system that produces 100% of your annual electricial consumption and has the optimal tilt and azimuth could reduce your electrical bills. You can use this information when speaking with solar installation companies or analyzing contractor bids.

5. Advanced options

In the above calculations, we have chosen a solar PV system size that produces 100% of your annual electricity consumption. We have also assumed optimal tilt and azimuth for your system. If you have more precise information about your site (for example, from a solar contractor’s bid), you can recalculate your estimated bill by entering this information in the boxes below. Otherwise, just skip to the next section.

System Size (kW) Azimuth (degrees) Tilt (degrees)
Total Annual Estimated Current Electric Bill: $-
Total Annual Estimated Electric Bill with Solar PV System: $-
Total Annual Electric Bill Savings*: $-

*Bill savings does not include the cost of purchasing or leasing the solar PV system.

6. What if peak billing hours change?

You may be wondering how your bills would change if the electric rate structure changes. We can’t predict the future, but we can share a possible scenario with you.

To calculate what your bill would be if the peak billing period was shifted from 11a.m.-6p.m. to 2p.m.-8p.m., click "Recalculate!"

Total Annual Electric Bill Savings with Current Peak: $-
Total Annual Electric Bill Savings with Later Peak: $-

*Bill savings does not include the cost of purchasing or leasing the solar PV system.

* All information provided is an estimate and not a guarentee. Monthly electric bill estimates do not include charges for natural gas or climate change credits. Monthly bill estimates with PV systems do not include the required one-time interconnection fee.