Path-Q Solar
What usage records are helpful if my utility bills cover only part of the year?
Answer
Use any reliable records that cover the missing period, such as utility account history, interval data, meter readings, prior occupant records when relevant, or comparable operating information. Clearly label estimates and avoid treating a short or unusual period as a full-year baseline.
Key points
- Ask the utility whether older bills or downloadable interval data are available.
- Record meter readings and dates if billing data cannot be recovered.
- Use weather, occupancy, and operating information to explain unusual periods.
- Separate actual data from estimates in the solar proposal.
What it depends on
- Length and representativeness of the available billing history
- Changes in occupancy, appliances, or operating hours
- Availability and resolution of meter data
- Seasonality of electricity use
Risks and trade-offs
- Extrapolating from one season can materially mis-size the system.
- Historical records may reflect a prior household or different equipment.
- Estimated data can be useful but should be tested against later bills.
Information you may need
- Available bills and meter readings
- Utility account or interval-data access
- Occupancy and appliance history
- Weather and operating changes during the missing period
Your next step
What to do next
Collect all available utility and meter records, document changes during the missing months, and ask the installer to show how the annual estimate was constructed.
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SQ00560