Summary of NERC Penalties
Quarter 3 - July 2023
Entergy Arkansas (EAL)
MISO Tariff and FERC's regulations
Section 40.2.5.e of the MISO Tariff and Sections 35.41(a) and 35.41(b) of the Commission’s regulations
EAL violated Tariff Section 40.2.5.e by submitting EcoMin and EcoMax values that restricted MISO’s ability to dispatch Hot Springs above or below a certain MW level, while at the same time maintaining a control mode reflecting that the facility was available for dispatch by MISO
EAL’s Hot Springs facility is a combined cycle gas turbine with an installed capacity of approximately 605 MW located in Malvern, Arkansas. Hot Springs has supplemental duct-firing capability (duct-firing), which increases the heat energy in the combined cycle process when the duct burners are lit or fired. The increase in the heat energy from the duct-firing increases the output of the facility’s Heat Recovery Steam Generator, which increases Hot Springs’ overall output of electricity. When operating the gas turbines without firing the duct burners, Hot Springs’ maximum output is between approximately 465 MW and 495 MW; when supplemental duct-firing is engaged the maximum output is between approximately 565 MW and 605 MW.
Enforcement considered the factors described in the Revised Policy Statement on Penalty Guidelines, including the fact that EAL cooperated with Enforcement during the investigation.
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