The D.C. Circuit denied a petition to review FERC’s approval of SPP’s tariff revisions setting up a uniform planning criteria in each transmission zone to evaluate zonal reliability upgrades.

FERC sustained a previous order accepting an SPP tariff revision that sets a process allowing each transmission zone to develop a uniform planning criteria.

FERC has approved SPP tariff revisions that establish an annual process for developing a single set of uniform zonal planning criteria.