Path-Q Solar

How much do fixed electricity charges limit the bill savings from solar?

Answer

Solar generally reduces only the bill components tied to electricity purchased or exported under the applicable tariff; fixed customer, service, minimum, or other non-bypassable charges may remain. Therefore, the maximum bill reduction is less than the full pre-solar bill whenever fixed charges are present.

Key points

  • Separate fixed charges from usage-based energy, delivery, demand, and export-related charges.
  • The effect can be material for properties with low consumption or relatively high fixed charges.
  • Solar may reduce energy purchases without eliminating the account or service relationship.

What it depends on

  • Utility tariff and bill structure
  • Monthly consumption and solar production
  • Export-credit rules
  • Whether demand or other charges are present

Risks and trade-offs

  • A savings estimate that applies the retail energy rate to the entire bill can be overstated.
  • Reducing consumption through efficiency can make fixed charges a larger share of the remaining bill.
  • Tariff changes may alter which charges solar can offset.

Information you may need

  • Itemized utility bills
  • Current tariff definitions
  • Production and self-consumption estimate
  • Any minimum-bill or non-bypassable-charge provisions

Your next step

What to do next

Mark each bill component as fixed, usage-based, demand-based, or export-related and model solar savings only against applicable components.

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