Path-Q Solar

What financial risk comes from relying on projected electricity price increases in a solar model?

Answer

If electricity prices rise more slowly than projected, solar savings and payback will be worse than modeled. Treat price escalation as an uncertain scenario, not as guaranteed income, and evaluate whether the project works with flat or modest price growth.

Key points

  • Higher assumed escalation increases modeled future savings and can shorten payback on paper.
  • Flat-price and low-escalation cases reveal dependence on the assumption.
  • The effect also depends on fixed charges, export compensation, usage, and rate structure.
  • Compare nominal price assumptions consistently with nominal costs and discount rates.

What it depends on

  • Current electricity charges and bill structure
  • Future rate changes
  • Self-consumption and export treatment
  • System production and household usage

Risks and trade-offs

  • Aggressive escalation assumptions can make a marginal project appear attractive.
  • Actual rates may rise unevenly or affect only some bill components.
  • Conservative escalation reduces modeled savings but improves decision robustness.

Information you may need

  • The model's escalation assumptions
  • Historical and available forward-looking rate information
  • Fixed, variable, and export-related bill components
  • Sensitivity results under flat and alternative escalation cases

Your next step

What to do next

Recalculate payback and ROI with flat, conservative, and base electricity-price assumptions before relying on the result.

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