LITTLE ROCK — Entergy Arkansas said Thursday it has completed its integration into the Midcontinent Independent System Operator, or MISO, a move the energy company said would save Arkansas customers more than $250 million over the next 10 years.

LITTLE ROCK — Entergy Arkansas said Thursday it has completed its integration into the Midcontinent Independent System Operator, or MISO, a move the energy company said would save Arkansas customers more than $250 million over the next 10 years.


"This is a great move for Entergy Arkansas in terms of savings and benefits for our customers," Entergy Arkansas President and CEO Hugh McDonald said in a news release. "We’re grateful to the Arkansas Public Service Commission, our MISO counterparts and hundreds of Entergy teammates and vendors for their efforts toward reaching this historic milestone."


The Public Service Commission gave approval earlier this year to Entergy Arkansas’ plan to leave its previous mutli-state agreement and join MISO. The transfer, or "cutover," to MISO’s system occurred Wednesday night.


One of the largest regional transmission organizations in the nation, MISO’s market includes 151 transmission customers, 128 electric generating plants and 11 transmission facility owners stretching from Canada to the Gulf of Mexico. Entergy can now buy, sell and transmit electricity within that marketplace.


MISO has said it will build a regional operations center in Little Rock next year and hire between 35 and 50 people to staff it.


Entergy Arkansas, which celebrates its 100th birthday this year, serves about 700,000 customers in 63 counties.