Defined term

Photovoltaic capacity factor

Photovoltaic capacity factor is electrical energy generated over a period divided by the energy that would result from operating at the stated rated capacity throughout that period.

Also known as PV capacity factor

measurement · Concept code GS-CONCEPT-042 · Last verified August 20, 2026

Definition and boundaries

Definition

Photovoltaic capacity factor is electrical energy generated over a period divided by the energy that would result from operating at the stated rated capacity throughout that period.

Definition claim verification: Verified August 20, 2026

In plain language

When comparing Photovoltaic capacity factor, keep the unit, time period, measurement boundary, and underlying assumptions the same on both sides.

What it is not

It is not module efficiency and it does not state when within the period energy was generated.

Decision context

Why it matters

The rating basis, energy boundary, period length, downtime, resource, orientation, and curtailment must be aligned before values are compared.

Decision-context claim verification: Verified August 20, 2026

Information boundary

This page provides general educational context, not a site design, production guarantee, utility determination, contract interpretation, legal opinion, tax conclusion, or individualized financial advice. Verify property, equipment, utility, jurisdiction, program, and agreement details before acting.

Concept relationships

Affects

  • Annual solar productionPublished conceptPhotovoltaic capacity factor can affect how Annual solar production is evaluated

Primary sources

What to do next

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