NPRR1096 Battery Duration for ECRS and NonSpin

Topics

By STEVE REEDY

The Gist

NPRR1096 limits the amount of ECRS and NonSpin that a battery is allowed to provide. The original NPRR filed by ERCOT would have only allowed batteries to provide ECRS and NonSpin at the level they could sustain for six-hours. The rationale was that any NonSpin/ECRS that was provided by batteries under the current rule could be totally depleted within an hour, and yet the Day Ahead Market clearing engine has no problem awarding the one hour capacity for a battery for the full 24 hours in a day. The ROS approved level of 2 hours represented a compromise between the two positions; however ERCOT insisted that a battery carrying NonSpin be able to carry it for 4 hours, so that is the level that eventually passed. ERCOT is open to revisiting this issue in the future.

Important Actions

9/28/2021 ERCOT submits NPRR
1/5/22 Joint commenters submit compromise comments (two-hour)
1/12/22 ROS approves two-hour compromise
2/2/22 WMS approves ERCOT comments of two house for NonSpin and four hours for ECRS
2/24/22 WMWG ERCOT solicits ideas for battery testing; requests all contact done through Nitika Mago.
3/9/2022 PRS approves language on an 80/20 vote
3/30/22 TAC approves language and adds an action item to look for a better solution