ONS Energy Selects Excelergy Revenue Manager Software Platform for C&I Customers in the Benelux Region.

Energy Editors/Business Editors

SCHIEDAM, Netherlands & LEXINGTON, Mass.--(BUSINESS WIRE)--Sept. 30, 2003

ONS/Excelergy rapid deployment team aiming for system

implementation in record time

ONS Energy, part of the Netherlands-based ONS Group, signed an agreement earlier this month to deploy the Excelergy Revenue Manager(TM) software platform to manage its billing and customer care for commercial and industrial (C&I) customers in the Belgium, Netherlands and Luxembourg markets. In what will be one of the fastest ever deployments of a fully functional billing, customer care and revenue management system, Excelergy Revenue Manager is expected to be operational by early October.

"Through growth and acquisitions, ONS Energy continues to add to our thousands of C&I customers in the Benelux region," said ONS Energy director Paul Levels. "To meet our customers' unique needs and demands, we required a flexible, scalable and rapidly deployable billing and customer care platform to replace a legacy system that we've simply outgrown. We chose Excelergy Revenue Manager based on its proven track record with other successful global utility companies, and because we believe it can help power our continued growth and expansion in additional markets in the months and years ahead."

Excelergy Revenue Manager is also deployed at leading global companies including Energiedirect/Essent NV (Europe), SembCorp Utilities (Asia-Pacific), FirstEnergy Solutions, BGE Home/Constellation Energy, Green Mountain Energy Company, Sempra Energy Solutions, Strategic Energy and Vectren Source (North America), among others.

To meet the sophisticated pricing and billing demands of its C&I customers, ONS Energy will also deploy the Excelergy Revenue Manager's Complex Billing(TM) configuration, a flexible and boundless rating and calculation engine that manages interval data for any time period down to 5-minute intervals or smaller. In addition, ONS Energy will deploy Excelergy Revenue Manager's Collaboration & Transaction Management(TM) configuration, which streamlines and manages all information exchange between ONS Energy, its market partners and central market operators in its respective European markets.

"The unprecedented speed of this full-scale system deployment is only possible with the truly open and flexible architecture underlying all Excelergy software platforms," said Bill Mahoney, president and CEO of Excelergy. "We are pleased to continue to set new industry standards for the delivery of rapid ROI through accelerated revenues, improved cash flows, reduced and avoided costs, increased staff productivity and superior care and service quality to customer and value chain partners alike."

Excelergy Revenue Manager is a multi-currency, multi-language billing, customer and revenue management software platform that enhances customer enrollment and retention, enables personalized invoicing and customer care, and improves revenue management and collections in restructuring markets around the world. The platform's rapid deployment and easy integration enable clients to more quickly and efficiently market and sell their products and services and more accurately bill and serve their growing numbers of customers across multiple markets and multiple commodities.

About ONS Energy

ONS Energy is part of the ONS Group, a multi-utility company based in Schiedam, The Netherlands. ONS has been an electricity supplier in Schiedam for decades, and has also developed various products and services for infrastructure, cable services and the environment. As a participant in the Amsterdam Power Exchange, ONS Energy buys energy at reasonable prices, a cost-savings benefit they share directly with their business clients. ONS Energy's traders and account managers advise clients on their purchase of energy and can offer tailor-made contracts. More information is available at www.onsgroep.nl.

About Excelergy(R) Corporation

Excelergy is a world leader in high performance software platforms that increase revenues, improve cash flows and reduce costs in the energy/utility industry and other restructuring value chains. Excelergy's highly flexible, scalable software systems automate forecasting, trading, scheduling, billing, settlement and customer/partner acquisition and care. They are based on an open, object-oriented, Web-centric, native XML technology architecture. Winner of corporate and product excellence awards from organizations including Power & Gas Marketing, Hart's Energy Markets and PennWell, Excelergy has its North American headquarters in Lexington, Massachusetts, its European headquarters in London, England and its Asia-Pacific headquarters in Melbourne, Australia. More information is available at www.excelergy.com.