New England ISO filing revises wind power dispatch procedures

ISO New England (NE-ISO) and the New England Power Pool (NEPOOL) Participants Committee have submitted revised tariff provisions to FERC that clarify the system operator’s existing wind power dispatch procedures.

Supported by testimony from a NE-ISO senior engineer, the Sept. 26 filing adds the Wind Dispatch Market Rule to the current tariff to define procedures for wind energy and explain that existing procedures, while not suitable for economic dispatch, will remain in effect until upgrades to the dispatch process are developed.

Current manual dispatch procedures that have been in place for nearly a decade are no longer appropriate for handling additional wind resource load, according to the filing.

In his supporting testimony, William Henson, senior engineer for the NE-ISO system operations department, explained that “as more wind resources have been installed, often in remote locations where the wind potential is greatest but the transmission system is not robust, the potential to overload parts of the transmission system has increased.”

These changes in the market have resulted in more frequent use of manual resource curtailment procedures.

“When there were few wind resources in New England, the manual curtailment procedures were adequate,” Henson said.

The filing parties requested that the wind dispatch market rule become effective Dec. 1.

NE-ISO and its market stakeholders are developing wind dispatch enhancements that will allow the automation of the process of computing and telemetering real-time dispatch instructions to wind resources, according to the filing.

“The [NE-ISO] is developing enhancements to the dispatch algorithm that will determine and telemeter to each wind resource an output limit approximately every five minutes,” Henson said. “When design details are complete, [NE-ISO] plans to continue to work with stakeholders to incorporate the dispatch enhancements for wind resources into the market rules.”

The filing parties anticipate that enhancements to the wind dispatch process could be in place early in 2014.