MISO completes integration of Entergy, other entities into regional grid

The Midcontinent ISO (MISO) at the stroke of midnight on Dec. 19 completed the integration of 10 transmission-owning companies, extending its footprint to the South and adding more than 18,000 miles of transmission, 50,000 MW of generation and 30,000 MW of load.

MISO now manages 65,280 miles of transmission and 196,000 MW of generation.

“With this change, MISO’s new members across the South will begin to receive the broad array of benefits that our markets provide, including the cost savings realized from improved reliability and efficient commitment and dispatch,” MISO President and CEO John Bear said in a statement. 

MISO is calling this newly integrated region MISO South and is constructing a South Region Operations Center in Little Rock, Ark.

In addition to the 10 transmission-owning companies, the integration includes six balancing authorities and 33 new market participants (below) from Mississippi, Louisiana, Arkansas, Texas and Missouri. An industry analysis in 2012 projected the new MISO members’ integration would result in $1.4bn of projected savings over a 10-year period, according to the statement.

MISO received NERC approval to serve as the balancing authority for the region in November. MISO has coordinated reliability services for Entergy since December 2012 and has assumed reliability coordination responsibility for the additional entities over the course of 2013.

To prepare for the integration, MISO and all of the stakeholders involved with the effort participated in a full year of readiness activities that included hundreds of training courses, system development, testing, and simulations, according to the statement. As the Reliability Coordinator for all the incoming local balancing authorities (LBAs), MISO was already familiar with reliability operations in the South and began modeling these entities for market activity in a staging environment in early December. After midnight, the locational marginal pricing went into effect in the new territory. 

MISO South Market Participant List

1. City of Malden – Board

2. City of Abbeville, La.

3. Arkansas Electric Cooperative Corp.

4. City of Alexandria, La.

5. Brazos Electric Power Coop

6. City of Benton

7. Buffalo Dunes Wind Project

8. Cleco Power (TransmissionOwner)(LocalBalancingAuthority)

9. Carthage Water and Electric Plant

10. City Water and Light Plant of the City of Jonesboro

11. City of West Memphis

12. City of Ruston, La.

13. Entergy Arkansas (Transmission Owner) (Local Balancing Authority)

14. Entergy Gulf States Louisiana (Transmission Owner) (Local Balancing Authority)

15. Entergy Louisiana (Transmission Owner) (Local Balancing Authority)

16. Entergy Mississippi (Transmission Owner) (Local Balancing Authority)

17. Entergy New Orleans (Transmission Owner) (Local Balancing Authority)

18. East Texas Electric Cooperative (Transmission Owner) (Local Balancing Authority)

19. Entergy Texas(Transmission Owner) (Local Balancing Authority)

20. Ewo Marketing

21. Exxon Mobil d/b/a The Baton Rouge Refinery

22. Exxon Mobil Oil d/b/a The Beaumont Refinery

23. Municipal Energy Agency of Mississippi

24. North Little Rock Electric Department

25. Oklahoma Gas and Electric Company d/b/a OGE Power Supply

26. City of Osceola, Arkansas Municipal Light and Power

27. City of Piggott Municipal Light Water and Sewer, Ark.

28. City of Poplar Bluff Municipal Utilities

29. Plum Point Energy Associates

30. Plum Point Services Co.

31. Rattlesnake Creek Wind Project

32. Sabine Cogen

33. South Mississippi Electric Power Association (Transmission Owner) (Local Balancing Authority)

Louisiana Energy and Power Authority (Local Balancing Authority)

Louisiana Generating (Local Balancing Authority)


About Rosy Lum 525 Articles
Rosy Lum, Analyst for TransmissionHub, has been covering the U.S. energy industry since 2007. She began her career in energy journalism at SNL Financial, for which she established a New York news desk. She covered topics ranging from energy finance and renewable policies and incentives, to master limited partnerships and ETFs. Thereafter, she honed her energy and utility focus at the Financial Times' dealReporter, where she covered and broke oil and gas and utility mergers and acquisitions.