New builds are credited at the fleet-average ELCC

Effective load carrying capability by penetration. Both the existing fleet and new builds are accredited at this average, which falls as more of the resource is added.

Resource

Season

Penetration-

average ELCC — how every MW, existing or new, is credited

Penetration

Accredited at

Source: SPP 2026 ELCC Study Report, Modo Energy

Average ELCC from SPP's public 2026 ELCC study (penetration decline and storage durations). New units sit on the same average tiers as the existing fleet (Planning Criteria v4.6 §7.1.6).

MODOENERGY