Path-Q Solar

How should I account for uncertain grid export rules when choosing system size?

Answer

Size the system using verified current export rules, then test scenarios with lower export value, export limits, curtailment, and no export compensation. Avoid relying on uncertain export revenue to justify a larger system.

Key points

  • Prioritize generation that offsets on-site consumption when export treatment is uncertain.
  • Compare smaller, export-limited, and storage-supported designs against the larger proposed system.
  • Use written utility tariff or program terms and identify any transition or grandfathering conditions.
  • Separate savings from self-consumption, avoided purchases, exports, and incentives.

What it depends on

  • Current utility tariff and export rules
  • Load profile and future electricity use
  • System production and degradation
  • Battery economics and operating limits
  • Financing and incentive assumptions

Risks and trade-offs

  • A smaller system reduces export exposure but may sacrifice economies of scale or future flexibility.
  • A battery can increase self-consumption but adds cost, replacement, and operating complexity.
  • Rules may change after installation or may depend on application and operation dates.

Information you may need

  • Written export terms
  • Interval load data
  • System production estimates
  • Battery and export-control options
  • Relevant contract and incentive deadlines

Your next step

What to do next

Ask for a scenario analysis showing payback or cash flow under current, reduced, capped, and zero export compensation.

Path-Q

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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.

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