The transition to MISO is the culmination of more than two years of planning and preparation by MISO, the Entergy utility operating companies and numerous stakeholders.
MISO is one of the largest regional transmission organizations — an organization that manages the flow of power on the grid and operates markets for the purchase and sale of electricity.
Entergy's utility operating companies — Entergy Arkansas Inc., Entergy Mississippi Inc., Entergy Texas Inc., Entergy Louisiana LLC, Entergy Gulf States Louisiana LLC, and Entergy New Orleans Inc. — have been working for more than two years to plan and prepare for the transition to MISO and to ensure their operating systems integrate seamlessly with those of MISO.
With the inclusion of Entergy's transmission system, MISO now comprises a network of electricity generators and users stretching from Canada to the Gulf of Mexico.
The Entergy utility operating companies are among hundreds of industry participants — generators, municipal utilities, co-operatives and power distribution companies — that comprise MISO's new South Region. Within the region are 151 transmission customers, 128 electric generating plants and 11 transmission facility owners.