May 16, 2002 — Top US energy retailer selects Excelergy’s billing, customer care and revenue management system for benefit of nearly half a million energy consumers

Excelergy® Corp. has signed a long term, multi-million dollar agreement to provide Green Mountain Energy Company, the nation’s largest and fastest growing retail provider of cleaner electricity, with Excelergy Advanced Business Package™.

Excelergy Advanced Business Package is a fully integrated customer care, billing and revenue management software platform that enhances customer acquisition and retention, enables personalized billing, and improves revenue management and financial settlement.

“We’ve chosen the Excelergy Advanced Business Package as our long-term billing solution because it’s the most effective platform to help fuel our continued growth and expansion,” said Roland Icard, chief information officer of Green Mountain Energy Company. “Over time it will enable us to bill and serve our new and existing customers at optimal levels. We’re now managing these critical business processes–and the cash flows associated with them–with greater control.”

The Excelergy Advanced Business Package efficiently manages Green Mountain Energy Company’s billing system for its nearly half a million customer accounts in seven states. It provides easy, secure access to a single customer information system for all Green Mountain Energy Company customer service representatives. The platform will be fully integrated with Green Mountain Energy Company’s existing systems, including the company’s customer acquisition system, which enables improved customer service quality, faster data processing, automated business processes and increased employee productivity–all at lower cost of ownership and operation.

“This agreement validates the value Excelergy products deliver to our growing number of clients,” said Bill Mahoney, president and chief executive officer of Excelergy. “From improved revenue growth and cash flows, to increased productivity, to unparalleled customer service quality, we deliver a return on investment that can be measured quickly where it counts most–on the bottom line. We are very pleased with the strong and highly productive business relationship shared between Excelergy and Green Mountain Energy Company.”

About Green Mountain Energy Co.
Green Mountain EnergySM provides cleaner electricity in several states. The company provides less-polluting electricity generated from sources including wind, solar, water, geothermal, biomass and cleaner-burning natural gas. Nearly half a million customers in seven states–California, Connecticut, New Jersey, Ohio, Oregon, Pennsylvania and Texas–have chosen Green Mountain EnergySM electricity.

About Excelergy® Corp.
Excelergy is a provider of high performance software products automating mission-critical business processes in the energy/utility industry and other restructuring markets. Excelergy automates six core business processes–forecasting, trading, scheduling, billing, settlement and customer/partner acquisition and care–through its growing number of product lines.

These highly flexible, scalable products are based on an open, object-based, Web-architected, native XML technology platform. Excelergy’s North American headquarters are located in Lexington, MA, with its European headquarters in Bristol, England and its Asia-Pacific operations based in Melbourne, Australia. More news and information about the company–including Excelergy’s Red Herring 100 recognition for the second straight year–is available at www.excelergy.com.