Path-Q Solar

What questions should I ask when an installer guarantees a specific bill reduction?

Answer

Ask exactly what is guaranteed, how the reduction is measured, which assumptions apply, what exclusions exist, and what remedy you receive if the result is missed. A bill-reduction guarantee is meaningful only when the contract defines the baseline, measurement period, customer obligations, and enforceable remedy.

Key points

  • Define the baseline bills, rate structure, usage level, weather normalization, and comparison period.
  • Clarify whether the guarantee covers production, utility charges, total bill, or net cost after financing.
  • Ask how changes in rates, usage, occupancy, export rules, outages, shading, and equipment failure are treated.
  • Require the remedy, claim process, deadline, and responsible party to be written in the contract.

What it depends on

  • The exact guarantee language
  • Utility rates, charges, and export treatment
  • Customer energy use and operating behavior
  • System performance and financing structure

Risks and trade-offs

  • A guarantee may exclude the factors that most affect the actual bill.
  • Production guarantees do not necessarily guarantee savings.
  • A remedy may be limited, difficult to claim, or dependent on records the customer must maintain.

Information you may need

  • Complete guarantee clause and exclusions
  • Baseline bills and usage assumptions
  • Measurement and dispute-resolution process
  • Remedy amount and installer or guarantor identity

Your next step

What to do next

Ask the installer to provide a redlined example showing how the guarantee would apply under both success and shortfall scenarios.

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