ATLANTA, GA; September 18, 2007 – Ventyx™, the world's largest private software provider to the utility industry, today announced a three-year managed care contract with Vectren Corporation (NYSE: VVC), affirming the company's commitment to offer the highest levels of service to its more than 1 million customers by investing in advanced customer and enterprise workforce management solutions from Ventyx.

Vectren, a progressive energy-holding company headquartered in Evansville, Ind., delivers gas and/or electricity to more than 1 million utility customers in Indiana and Ohio. The company signed a three-year agreement with Ventyx, with the option of adding a fourth year, to ensure access to the most advanced releases and newest functionality within Ventyx Customer Suite and Service Suite solutions. Additionally, the company is upgrading to the latest release of Ventyx enterprise workforce management software, Service Suite 8.0.

"At Vectren, we know success comes from understanding and satisfying our customers' desires,” said Daniel Bugher, Vectren CIO. "Therefore, we are committed to investing in technology solutions to help us reach our goals, such as the Customer Suite and Service Suite technologies from Ventyx. As a long-time client of both Indus and MDSI, we expect the combination of these two industry-leading companies to continually improve the technology we need to address our customers' requirements.”

As part of the managed care agreement, Ventyx will provide maintenance and services offerings tailored specifically to Vectren's unique business needs. These services will ensure the technical currency of Vectren's implemented software, as well as the right to future releases of the software. Therefore, the company can fully employ the robust capabilities of today's solutions and easily embrace new functionality as it is released by Ventyx in the future.

"This new agreement demonstrates Vectren's firm commitment to offering the utmost in customer service supported by the industry's most advanced solutions for customer and service management,” said Ventyx President and CEO Greg Dukat. "Furthermore, it represents yet another Indus/MDSI customer which has validated the combination of our companies by investing in Ventyx. We are proud that Vectren has recognized our leadership in the industry and commit ourselves to ensuring their continued leadership in theirs.”

About Vectren Corporation
Vectren Corporation (NYSE: VVC) is an energy holding company headquartered in Evansville, Ind. Vectren's energy delivery subsidiaries provide gas and/or electricity to more than 1 million customers in adjoining service territories that cover nearly two-thirds of Indiana and west central Ohio. Vectren's non-utility subsidiaries and affiliates currently offer energy-related products and services to customers throughout the Midwest and Southeast. These include gas marketing and related services; coal production and sales; and energy infrastructure services. To learn more about Vectren, visit www.vectren.com.

About Ventyx
Ventyx is the leading provider of best-of-breed software solutions which enable energy, utilities, telecommunications, broadband and other commercial field service organizations to optimize the management of their customers, workforce, spare parts inventory, equipment, tools and documentation -- empowering organizations to maximize efficiencies in their customer relationships, facilities, workforce and field service operations. The Ventyx Global Energy Decisions business unit is a leading provider of utility industry solutions for generation asset and portfolio optimization, energy trading and risk management, schedule management, price and load forecasting, maintenance optimization, resource planning, fuel budgeting, plant betterment and environmental compliance analysis. With offices in North America, Europe, the Middle East and Asia-Pacific, Ventyx has more than 700 clients in select asset-intensive service-based industries. For more information, visit our Website at www.ventyx.com.

Ventyx is a trademark of Ventyx Inc. Other company and product names may be trademarks of the respective companies with which they are associated.

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