MISO Files Entergy Transmission Cost Allocation Plan with FERC

CARMEL, Ind., Nov. 28, 2011 /PRNewswire/ — Today, MISO, alongside a group of
its current transmission owners, and Entergy Arkansas took steps to provide
greater reliability and lower costs for Entergy customers. MISO and a majority
of the MISO Transmission Owners submitted a joint filing of revised tariff
language to the Federal Energy Regulatory Commission (FERC) that allocates
transmission costs upon Entergy’s integration into MISO. Additionally, Entergy
Arkansas made a formal request to Arkansas regulators to join MISO.

FERC previously instructed MISO to re-submit its proposed transmission cost
allocation as a change to its tariff, rather than a waiver. MISO’s fundamental
approach is not materially different. Under the tariff change, existing MISO
members will pay for projects that are underway or that benefit them
exclusively. Entergy will pay for projects that benefit the company and its
customers. MISO worked with stakeholders, including state regulators, for
several weeks to have them review the tariff changes and incorporate their
comments.

“Fair and equitable distribution of transmission costs is a big step toward
making sure Entergy, its customers and current MISO members receive the benefits
this initiative will generate,” said John R. Bear, President and CEO of MISO.
“Today’s filing with the FERC demonstrates broad support for Entergy’s
integration into MISO.”

MISO’s transmission cost allocation plan seeks to ensure that Entergy only pays
for projects that benefit Entergy customers and current MISO members only pay
for projects that benefit current members. The MISO proposal is designed to
assign transmission costs roughly commensurate with benefits. MISO’s analysis
provides that the addition of Entergy will provide benefits to all MISO
participants.

“The filing seeks to achieve an equitable and balanced outcome for the current
MISO membership and for Entergy,” said JoAnn Thompson, Chair of the MISO Owners
Committee. “The majority of MISO Transmission Owners support the tenets of this
filing including standards for comparability, equitable cost allocation based on
the principle that costs should be roughly commensurate with benefits, and
preventing inappropriate cross-subsidization for either the existing MISO
membership or Entergy.”

In addition, Entergy Arkansas submitted an official “change of control” request
with the Arkansas Public Service Commission (APSC).

“Entergy Arkansas took another important step toward making sure the company’s
customers receive the benefits of joining the MISO market,” said Bear. “Those
benefits are clear. Entergy’s full integration into MISO will reduce customers’
costs, while also providing the type of planning and infrastructure upgrades
necessary to improve reliability and increase efficiency in the Entergy system.”

In addition to Entergy Arkansas’ filing, MISO also filed for a certificate of
convenience and necessity with the APSC. This is largely a procedural step that
allows MISO to operate in the State of Arkansas.

About MISO
MISO ensures reliable operation of, and equal access to high-voltage power lines
in 12 U.S. states and the Canadian province of Manitoba. MISO manages one of the
world’s largest energy markets, clearing more than $27 billion in energy
transactions in 2010. MISO was approved as the nation’s first regional
transmission organization in 2001. The non-profit 501(C)(4) organization is
governed by an independent Board of Directors and is headquartered in Carmel,
Ind., with operations centers in Carmel and St. Paul, Minn. Membership in the
organization is voluntary.

SOURCE MISO