Capacity imports could clear at lower prices than internal resources under proposed import limits being considered by PJM.
PJM officials are planning to create an RTO-wide import limit as well as individual limits for PJM interfaces with the North, South and West, Stu Bresler, vice president of market operations, told the Market Implementation Committee last week.
If the external limit is not reached, the “rest of RTO” and “outside RTO” regions would clear together at the same price. Once the cap is reached, however, the marginal external resource would set the price for the “outside RTO” region while the marginal internal resource would set the price for the “rest of RTO” region.
If there is price separation, internal resources will clear at a higher price than imports, just as resources east of PJM’s west-to-east constraints are often priced higher, Bresler said.
An alternate approach being considered by PJM is to require that resources have firm transmission as a condition for allowing them to offer into the auction.
PJM said last month that its initial analysis indicated the RTO should be able to absorb the more than 7,400 MW of imports that cleared in May’s capacity auction for 2016-17.
Officials said that their initial review found PJM can import 11,000 to 12,000 MW simultaneously. That would allow at least 7,500 MW of imports to clear in the capacity auction, with an additional 3,500 MW reserved for the RTO’s Capacity Benefit Margin — a set aside to be used in emergencies. (See Current Capacity Imports OK: Study)
However, PJM’s Mark Sims told the Planning Committee last week that the estimate may be overly optimistic because it assumes redispatch of almost 10,000 MWs. “We know in real-time that these kinds of adjustments … haven’t happened,” he said.
Sims said staff will conduct a revised analysis that puts more “realistic” limits on redispatch. The new analysis also will set a threshold distribution factor of 3% rather than the 1% factor used in the original analysis. “We don’t want to consider distribution facilities in Florida,” he said.
The Planning Committee approved a problem statement on a proposed cap last month in response to the May capacity auction, in which cleared imports increased by more than 3,000 MW.
Officials plan to seek Planning Committee approval of the import caps next month. PJM wants to implement the new rules prior to posting the planning parameters for the next Base Residual Auction.
