# Primary power feed

> First-line electrical service from the utility to the building.

**Canonical URL:** https://classa.info/glossary/primary-power
**Page type:** glossary
**Last updated:** 2026-04-01T00:00:00.000Z
**License:** CC BY 4.0 with attribution to Class A Atlas (https://classa.info).

## TL;DR
- First-line electrical service from the utility to the building.
- Class A trophy typically has dual-fed primary power from separate utility substations to provide N+1 utility redundancy.

## Key facts
- **category**: MEP
- **regionScope**: Global

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Citation: Source: Class A Atlas (https://classa.info/glossary/primary-power), updated 2026-04-01T00:00:00.000Z.