Arizona has joined Colorado, Nevada and Oregon in exploring membership in an RTO in the Western Interconnection.

FERC provided guidance to Western electricity sellers on how and when to seek exceptions for transactions that exceed the region’s $1,000/MWh soft cap.

Arizona Public Service (APS) can continue to charge market-based rates in Tucson Electric Power’s balancing authority area, FERC ruled.

FERC accepted transmission calculations submitted by Southwestern transmission-owning utilities in support of their requests for market-based rates.

Tucson Electric could become the latest Western utility to lose authorization to sell electricity at market-based rates within its balancing authority area.