FOR IMMEDIATE RELEASE

Midwest ISO Licenses PLEXOS Software

June 21, 2010

Sacramento, California

The Midwest Independent Transmission System Operator, Inc. (“Midwest ISO”) recently licensed the PLEXOS market-simulation software from PLEXOS Solutions LLC located in Sacramento, CA.  The Midwest ISO intends to use PLEXOS in its Transmission Planning and Operations departments for several specific purposes including detailed wind integration analyses.

According to Eric Toolson, PLEXOS Solutions CEO, “PLEXOS is an ideal tool for the MISO because of its capability to perform a very advanced unit commitment and dispatch that models all ancillary services including regulation up and down.  In addition, PLEXOS can accurately simulate the real-time market with a 5-minute dispatch step in a complicated nodal market”.

Contact / More Information:  For more information on the PLEXOS software, please contact Eric Toolson at 916-722-1484 or etoolson@plexossolutions.com.

About PLEXOS for Power Systems: PLEXOS uses an industrial-strength LP/QP/MIP solver to deliver solutions to tough utility problems. PLEXOS is the platform at over 100 organizations globally for solving problems in operations, planning and risk, and market and transmission analyses (including LMP formation). For more information, visit www.plexossolutions.com.

About PLEXOS Solutions LLC: The Company is focused on providing information services, consulting, and software solutions to utilities, gencos, consultants, and ISOs. The management and technical team understands this market and knows how to assist customers to deploy the next generation solution.