After seemingly endless delays, the California Independent System Operator ("CAISO") on February 9, 2006, finally submitted to FERC its long-promised market redesign and technology upgrade ("MRTU") tariff. Originally proposed in 2002 in response to FERC findings that the California markets were dysfunctional, the CAISO undertook to redesign its markets and software. The CAISO itself acknowledges the MRTU tariff remains incomplete; before the MRTU system can come on-line, the CAISO will have more work to do, including developing business practices and determining the appropriate methodologies for designating resources needed to meet day-ahead procurement targets, releasing post-day ahead resource adequacy capacity, and allocating CRRs to merchant transmission projects. Comments on the tariff are due March 27, 2006, with reply comments due April 17.
The CAISO's new tariff includes several prominent changes to its market design and market mitigation, including the implementation of a day-ahead market, an hour-ahead scheduling process, and a real-time market that uses locational marginal pricing ("LMP") and security-constrained unit commitment to dispatch resources and manage congestion.
In its filing, the CAISO extols the virtues of LMP, claiming its version of LMP is similar to the system in place in other of the country's organized markets. The CAISO also claims it does not expect prices to rise as a result of LMP. For the most part, MRTU will settle charges on an aggregated basis with three load aggregation points ("LAPs"), which correspond to the territories of California's three investor-owned utilities. However, certain transactions (such as those involving pump loads, exports, metered sub-systems, existing transmission contracts, and transmission ownership rights) will be scheduled and settled on a more "granular" level – i.e., on the basis of nodes that will often be confined to an area smaller than an LAP. MRTU will also implement congestion revenue rights ("CRRs") to help customers hedge congestion costs. On the contentious issue of how to allocate such rights, the CAISO proposes to allocate CRRs first to California's load-serving entities ("LSEs"), who, the CAISO reasons, helped pay for the transmission system. Any remaining CRRs will be auctioned off to all creditworthy parties. Entities serving load outside of California may obtain CRRs by pre-paying certain wheeling charges.
MRTU will implement a residual unit commitment ("RUC") process that should help ensure reliability by allowing the CAISO grid operator to secure on a day-ahead basis incremental capacity it forecasts it will need in real-time. The CAISO hopes for the RUC process to work in concert with the California Public Utilities Commission's ("CPUC's") resource adequacy program. The CAISO will also undertake to perform local capacity studies to assess the amount of capacity needed in transmission-constrained areas. It will procure capacity to make up for any shortfalls and allocate the costs to any LSEs that fail to maintain sufficient reserves.
In addition to redesigning its market, the MRTU proposal adds several market power mitigation provisions, based on similar measures in PJM. The filing includes an initial $500/MWh cap for energy bids, with a plan to raise the cap to $1000/MWh over the next two years in increments of $250/MWh. The CAISO also proposes to implement a $250/MWh cap for ancillary services and RUC availability bids. The MRTU proposal would also revise the vexatious must-offer obligation so that only those units whose capacity is needed to meet a utility's resource adequacy requirements would be required to offer their capacity into the CAISO's markets.
The CAISO is aiming for MRTU to become effective in November 2007. In order for its software vendors to have sufficient time to develop appropriate software, the CAISO thus asked FERC to approve the MRTU tariff by this June, without holding any hearings or requiring any changes.