Path-Q Solar

How should I compare solar proposals that assume different export compensation?

Answer

Normalize each proposal using the same verified export rules, consumption profile, system output, degradation assumptions, financing, and cost basis. Compare self-consumed energy separately from exported energy because exported energy may receive a different value.

Key points

  • Ask each installer to show annual production, on-site consumption, exports, imports, and the compensation applied to each.
  • Use the utility's applicable tariff or written program terms rather than an unsupported export-rate assumption.
  • Compare system cost and savings both before and after export compensation, using consistent escalation and degradation assumptions.
  • Test lower-export and lower-compensation scenarios, especially if rules may change.

What it depends on

  • Utility tariff and export program
  • Hourly or monthly load profile
  • System size, orientation, and production model
  • Battery or export-limiting controls
  • Financing and operating costs

Risks and trade-offs

  • A larger system may produce more total energy but less valuable energy if exports are compensated poorly.
  • A proposal with optimistic export assumptions can appear cheaper or faster to pay back.
  • Changing tariffs or program eligibility can alter future savings.

Information you may need

  • Current utility tariff and export terms
  • At least one year of interval or billing data
  • Production model and equipment details
  • Financing, maintenance, and degradation assumptions

Your next step

What to do next

Create a side-by-side comparison using one verified export assumption and request revised proposals if their modeling assumptions differ.

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