MISO Completes Largest-Ever Power Grid Integration

              MISO Completes Largest-Ever Power Grid Integration

Four-State Electric Grid Region "Cutover" Took Place at Midnight

PR Newswire

CARMEL, Ind., Dec. 19, 2013

CARMEL, Ind., Dec. 19, 2013 /PRNewswire/ --Cheers went up in the MISO control
room last night after more than two years of intensive planning and training
led to the smooth integration of a four-state region of the electric grid
across the South into MISO's existing footprint in the Midwest. The change in
control, or "cutover," took place at the stroke of midnight as Wednesday
passed into Thursday, and extends MISO's operational and market footprints
from the Gulf of Mexico all the way to Manitoba, Canada.

"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," said MISO President and CEO John Bear. "Collectively, we celebrate
the successful integration and can begin to focus on the future - delivering
reliability and economic benefits to millions more people."

In 2012, an independent industry analysis projected savings of $1.4 billion
over a 10-year period as a result of the new members joining MISO. The study
reinforced MISO's core belief that a collective, region-wide approach to grid
planning and management delivers the greatest benefits as evident through
MISO's Value Proposition. 

In total, MISO now manages a combined footprint of 65,280 miles of
transmission with total electric generation capacity throughout MISO of
approximately 196,000 MW, making MISO one of the largest power grid operators
in the world. This will result in more efficient dispatch of resources to
meet energy demands across the region as reflected in MISO's one-of-a-kind LMP
Contour Map that allows for a detailed visualization of real-time market
conditions.

The integration added 10 new transmission owning companies, six local
balancing authorities and 33 new market participants from Mississippi,
Louisiana, Arkansas, Texas and Missouri to MISO. This new region – referred to
as MISO South – includes the following transmission owners and local balancing
authorities: Entergy (Arkansas, Mississippi, Louisiana, Texas, Gulf States and
New Orleans), Cleco Corporation, Lafayette Utilities System, Louisiana Energy
and Power Authority, Louisiana Generating, South Mississippi Electric Power
Association and East Texas Electric Cooperative.

To prepare for the cutover, MISO and all of the stakeholders involved with the
integration effort participated in a full year of readiness activities that
included hundreds of training courses, system development, testing, and
simulations. As the Reliability Coordinator for all the incoming Local
Balancing Authorities (LBA), 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.

"With this integration and MISO's transition to a Regional model, the RTO has
greater ability to meet individual customer needs," said Todd Hillman,
regional vice president, MISO South. "Our goal is to provide stronger
analysis of operational issues and inclusive policy input to enhance each
member's ability to serve the country's overarching need of energy stability."

MISO has coordinated reliability services for Entergy since December 2012,
assuming reliability coordination responsibility for the additional entities
over the course of the year.

In early November 2013, MISO received NERC approval to serve as the balancing
authority for the region.

To better support the recent integration from an operational perspective,
construction is underway on MISO's new South Region Operations Center in
Little Rock, Ark., reinforcing its commitment to meet regional needs and
concerns.

More information about the integration and history of MISO is available on the
company's website at www.misoenergy.org.

About MISO
MISO ensures reliable operation of, and equal access to, high-voltage power
lines in 15 U.S. states and the Canadian province of Manitoba. MISO manages
one of the world's largest energy markets, with more than $18 billion in
annual gross market energy transactions. MISO was approved as the nation's
first regional transmission organization in 2001. The not-for-profit
organization is governed by an independent board of directors and is
headquartered in Carmel, Ind., with operations centers in Carmel and Eagan,
Minn.

SOURCE MISO

Website: http://www.misoenergy.org
Contact: MISO Media Relations - (317) 432-4507