Path-Q Solar
How do electricity export rules affect the savings from excess solar production?
Answer
Export rules determine how excess generation is credited, compensated, limited, or carried forward, so they can materially change the value of an oversized system and the benefit of a battery. The savings analysis must use the current tariff and applicable export terms rather than assuming exported electricity is worth the same as electricity purchased from the grid.
Key points
- Export compensation may differ from the retail purchase rate.
- Rules may vary by customer class, system size, enrollment date, time of export, or service arrangement.
- Credits may have limits, expiration, carry-forward, or settlement provisions.
- A battery or load shifting can increase self-consumption when exports have lower value, subject to losses and equipment cost.
What it depends on
- Current utility tariff and export program
- System size, interconnection approval, and customer classification
- Timing and amount of exports
- Battery cost, efficiency, control strategy, and operating rules
Risks and trade-offs
- Using retail-rate assumptions for all exports can overstate savings.
- A battery may improve export value but may not recover its cost solely through energy shifting.
- Future rule changes can affect systems differently depending on program terms.
Information you may need
- Current export tariff or agreement
- Proposed system production and hourly load profile
- Battery operating assumptions and costs
- Any export limits or program eligibility conditions
Your next step
What to do next
Verify the current export terms with the relevant utility or provider and rerun the financial model using the actual crediting, limits, and settlement rules.
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