Bloomberg News

MISO Taking Control of Entergy System Will Extend Grid to Gulf

December 18, 2013

Midcontinent Independent System Operator Inc. will provide power to communities from Canada to the Gulf of Mexico after it takes control of Entergy Corp.’s southern transmission system at midnight, creating the biggest electricity network in the U.S. in terms of area.

The Carmel, Indiana-based grid operator will expand its footprint from Manitoba and the U.S. Midwest to the Louisiana coast. The move will add 18,000 miles of transmission lines and about 40,000 megawatts of generating capacity in Arkansas, Mississippi, Louisiana and southeastern Texas.

These new territories will give the rest of the Midwest access to power supplies from natural gas and nuclear plants as the region faces a deficit in 2016 with coal plants shutting down, said Todd Hillman, regional vice president of MISO’s southern region. Entergy (ETR:US) said joining MISO will eliminate the need to pay for 1,000 megawatts of generating capacity next year and will save its customers $1.4 billion over the next decade.

“We’re trying to maximize the value of the wholesale transmission system,” Hillman said in a telephone interview. “In addition to Entergy, we’ve got nine other transmission owners and five other balancing authorities coming into the MISO system tonight also.”

MISO will start reporting spot prices for three new trading hubs at 12:05 a.m. Eastern time: Arkansas, Louisiana and Texas.

System Size

At midnight, MISO will increase its transmission system by 27 percent to 83,787 miles and boost its generating capacity by about 30 percent to 171,964 megawatts. Along with Entergy, the southern expansion will include systems operated by Cleco Corp., South Mississippi Electric Power Association, Louisiana Energy and Power Authority and Louisiana Generating LLC.

A survey of MISO market participants shows they expect the region to see a shortfall of 7,500 megawatts to 8,500 megawatts in 2016, Hillman said.

About 51 percent of the generating capacity in MISO’s Midwest region is from coal versus 33 percent from other fossil fuels and 7 percent nuclear. Coal’s share will drop to 46 percent after the Entergy integration.

Hillman said MISO expects to be the biggest grid operator geographically after the integration of the Entergy system. He said it will be smaller than PJM Interconnection LLC in terms of overall generating capacity, as PJM operates in the country’s big population centers along the East Coast. PJM serves more than 160 million people in 13 states and Washington, Philadelphia and Chicago.

Entergy Role

Entergy will continue to operate regulated utilities in such places as Arkansas and Louisiana, but will now be able to purchase all of the electricity to serve households and businesses through the MISO wholesale market, said John Hurstell, vice president of system planning with Entergy, which is based in New Orleans. The company will also sell all of the output from its power plants through MISO, he said.

“If Entergy saves a dollar on generating costs, that’s a dollar less we have to get from our ratepayers,” said Hurstell. “Our customers don’t care whether they get their power from the Entergy units or some other units. They just want to get the lowest price possible.”

To contact the reporters on this story: Naureen S. Malik in New York at; Harry R. Weber in Houston at

To contact the editor responsible for this story: Dan Stets at

China's Killer Profits

Companies Mentioned

  • ETR
    (Entergy Corp)
    • $87.32 USD
    • 1.32
    • 1.51%
Market data is delayed at least 15 minutes.
blog comments powered by Disqus