Path-Q Solar

How should rising electricity prices be treated in a solar payback forecast?

Answer

Treat future electricity-price growth as an uncertain scenario, not a guaranteed benefit. Use the current tariff as the starting point, model zero, moderate, and higher-growth cases, and show how each case changes annual savings, payback, and total return.

Key points

  • Apply rate assumptions to the portions of the bill that solar can actually offset, not automatically to every charge.
  • Model energy charges, demand charges, fixed charges, export credits, and time-based rates separately.
  • Use nominal or real dollars consistently and state whether inflation is included.
  • Show results before and after financing, degradation, maintenance, and replacement costs.
  • A shorter forecast payback under high rate growth should not be presented as certain.

What it depends on

  • Current tariff structure
  • Self-consumption and export treatment
  • Expected system production and degradation
  • Chosen rate-growth scenarios and financing terms

Risks and trade-offs

  • High escalation assumptions can make an otherwise weak project appear attractive.
  • Flat or declining rates can materially lengthen payback.
  • Utility rate changes may affect different bill components differently.

Information you may need

  • Current tariff and historical bill changes
  • Production and load-matching analysis
  • System costs and financing
  • Zero-growth, base-case, and high-growth forecast outputs

Your next step

What to do next

Request a sensitivity table showing payback and cumulative cash flow under multiple rate-growth assumptions, including zero growth.

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SQ00177