Proponents of SPP’s Markets+ argued in their last “issue alert” that the day-ahead market option provides a robust footprint with “exceptional generation and load diversity” across the region while also claiming recent warnings about its seam with CAISO’s EDAM are overblown.

The Bonneville Power Administration should remain in CAISO’s WEIM and hold off on joining a day-ahead market, Seattle City Light and other Northwest parties urged in a letter sent to BPA CEO John Hairston.

The federal government has put on hold nearly $1 million in funding toward the development of a new independent Western RO to oversee CAISO’s WEIM and EDAM, the West-Wide Governance Pathways Initiative’s Launch Committee said.

California state lawmakers introduced a much-anticipated bill to implement “Step 2” of the West-Wide Governance Pathways Initiative, marking a significant step toward the creation of a new independent “regional organization” to oversee governance of CAISO’s markets.

BPA would have to strike several types of agreements, many of which are complex and could take years to implement, to tackle seams that could arise if BPA joins a day-ahead market, agency staff said during a workshop.

BPA could face high implementation fees and operating costs under both SPP’s Markets+ and CAISO’s EDAM, but exact amounts are in flux.