If you have reduced electricity use before signing an SDG&E-area solar-plus-battery PPA, ask the provider to update the proposal’s household-use assumptions. A suitable system can complement efficiency improvements, but the comparison should reflect the home you expect to operate rather than equipment you have already removed or replaced.
This guide uses primary sources checked October 25, 2026. It concerns planning a proposal, not a claim that an existing PPA automatically changes when household consumption falls.
Update the household picture
SDG&E’s Home Energy Survey asks about the home and its appliances to improve tailored energy reports and suggestions. Update that information when household equipment changes. The survey is a useful starting point for identifying opportunities; it is not a solar production forecast or a guarantee of savings.
SDG&E’s usage tools let customers review hourly, weekly and monthly use. Bring that history, recent bills and dates of completed improvements to the solar discussion. Keep account passwords private; use appropriate document-sharing arrangements with your provider.
The CPUC solar guide recommends considering home efficiency before solar because lower energy use can affect the system size needed.
Separate completed changes from hoped-for savings
Prepare a short list identifying:
- What changed, such as removing a second refrigerator or replacing inefficient equipment.
- When it changed, so the provider can identify which bills still describe the old setup.
- What usage has actually been measured afterward.
- What additional reductions are only estimates or future plans.
A mild month after an improvement is not enough, by itself, to establish a full year of savings. Ask the provider how weather, occupancy and seasonal equipment use were considered. If an improvement has not happened yet, request a scenario with and without it rather than presenting the reduction as established fact.
Compare against the same future home
For illustration only, suppose a household previously used 8,000 kWh annually. Assume documented improvements are estimated to reduce future use by 1,000 kWh, leaving a working forecast of 7,000 kWh. These invented figures are not a prediction for any particular appliance or home.
Request a comparison between that 7,000-kWh household without solar and the same household with the proposed solar and battery system. Otherwise, a proposal may mistakenly count the efficiency improvement’s benefit as part of the solar benefit too.
Have the provider show the retained historical data and the adjustment separately. Ask whether the revised demand changes the proposed solar size, expected self-consumption, exports, battery operation or total payments. A lower consumption forecast does not establish a particular dollar saving without those details.
Keep utility and PPA payments distinct
SDG&E’s Solar Billing Plan distinguishes grid purchases from energy exported for credits. Have the comparison use the tariff and generation provider that apply to your account; existing NEM customers need their own billing treatment. A reduction at one time of day should not automatically receive the value of electricity at another time.
A qualifying no-upfront PPA can preserve cash while providing access to solar and storage. The CPUC guide explains provider ownership and payments for solar generation. Reducing household consumption does not necessarily reduce the electricity generated by the panels or the amount billable under the agreement. Ask how your contract measures charges, then review the rate, escalator, term, battery fees, maintenance and transfer provisions alongside remaining utility costs. No upfront purchase does not mean free electricity or guaranteed savings.
Our 100% solar-offset guide explains why an annual energy percentage alone cannot describe the complete bill.
Retain the backup priorities
A more efficient home still needs a defined backup design. General battery guidance explains that supported circuits, available charge and simultaneous demand limit operation. Ordinary grid-tied solar alone generally does not provide outage power; compatible backup equipment and sufficient sunlight are needed for outage recharging.
Bring your improvement dates, usage records and proposal to a West Coast Alternatives consultation. An updated comparison can help match equipment and ongoing costs to the household you actually plan to run.