Transmission Planning Horizon

Transmission planning period.

Definition by NERC

Source: ¹

Near-Term Transmission Planning Horizon is the transmission planning period that covers Year One through five.

Long-Term Transmission Planning Horizon is the transmission planning period that covers years six through ten or beyond when required to accommodate any known longer lead time projects that may take longer than ten years to complete.

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Last modified: 2025-06-20

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1. NERC (2025). Glossary of Terms Used in NERC Reliability Standards. https://www.nerc.com/pa/Stand/Glossary%20of%20Terms/Glossary_of_Terms.pdf ↩