The California ISO is deploying the functionality of its Energy Storage and Distributed Energy Resources (ESDER) Phase 4 initiative, effective trade date Nov. 1, 2021 for both Real-Time and Day-Ahead Markets of Nov. 1, 2021.
The California ISO is implementing its ESDER Phase 4 functionality that includes:
- new end-of-hour state-of-charge bid parameter in real-time to manage the usage of a storage resource throughout the day;
- introduction of market power mitigation to energy storage resources.
- new storage default energy bid (DEB) option;
- new maximum daily run time parameter registered in the Master File for demand response resources.
With the introduction of the storage DEB, scheduling coordinators of storage resources may elect the storage default energy bid option. As part of this election, they may also wish to register a non-zero variable storage operations cost which is the component of the storage DEB calculation that represents cycling and variable operations costs. To register a non-zero variable storage operations cost, Scheduling Coordinators may follow the draft guidance in Attachment D.9.1 to the BPM for Market Instruments, found in proposed revision request (PRR) 1381.
Scheduling coordinators of demand response resources can register maximum daily run time parameters by submitting an updated generating resource data template (GRDT).
Additional information on the new ESDER Phase 4 functionality is detailed in revised versions of the BPM for Market Instruments and BPM for Market Operations. The Proposed Revision Requests (PRR) detailing these edits are available on the ISO’s Business Practice Manual Change Management website.
Please refer to the links below for more information on ESDER Phase 4 functionality and implementation.
ESDER Phase 4 Transmittal Letter:
http://www.caiso.com/Documents/Aug27-2021-TariffAmendment-EnergyStorageDistributedEnergyResource-Phase4-ER21-2779.pdf
ESDER Phase 4 Customer Training:
http://www.caiso.com/Documents/Presentation-Energy-Storage-Distributed-Energy-Resources-Phase-4-Training.pdf 
