This week's company briefs include news on Aliso Canyon, NorthWestern Energy, PacifiCorp, First Energy, DTE and others.

Arizona Public Service and Puget Sound Energy began transacting in the Western Energy Imbalance Market (EIM) on Oct. 1, bringing the region’s only real-time market up to five members.

Transmission industry owners, operators, generators, regulators, financiers and other key players from the Western U.S. attended Infocast’s 8th annual Transmission Summit West.

FERC approved the CAISO plan to for a new market mechanism for itself and the Western EIM designed to integration of variable renewable energy resources.

FERC rejected for a second time proposed rules by Arizona Public Service on external resources can use dynamic scheduling to participate in the EIM.

Western utility leaders at the CAISO annual stakeholder event said they welcome the operational benefits and increased regional cooperation of the EIM but remain wary of organizing the wider West under a CAISO-run RTO.

The newly established Western Energy Imbalance Market (EIM) governing body kicked off its first meeting last week by electing its leadership.

CAISO launched an initiative to develop a greenhouse gas accounting system suitable for an expanded ISO.

Arizona Public Service and Puget Sound Energy have met the milestones to participate in the CAISO-run Western EIM and will begin trading in the market on Oct. 1.

CAISO is developing a plan to shield small transmission owners from upgrade costs for interconnecting generation to serve load outside the TOs’ service areas.