AWS Energy Services Signs Constellation Power Source as Initial Beta-Test Customer

AWS Convergence Technologies to Provide Real-Time Weather Information to Energy Marketer

Gaithersburg, MD (April 22, 2002) - Constellation Power Source has signed on as one of the first energy marketing companies to beta test AWS Energy Services' new real-time weather information and analysis tools on its trading floor. AWS Energy Services (www.aws.com/energy) is a newly formed division of AWS Convergence Technologies that today unveiled a suite of weather information tools that customized for the energy industry (see separate press release "AWS Convergence Technologies Launches Energy Services Division with Instantaneous Weather Information and Analysis Solutions for the Energy Industry").

Constellation Power Source, a wholly owned subsidiary of Constellation Energy Group (NYSE: CEG), is now testing AWS tools on its real-time and term-trading desks. Based in Baltimore, Maryland, Constellation Power Source markets and trades electricity in the wholesale market, manages associated risks in volatile electricity markets, and is aligned with its affiliates which develop, own and operate power plants in strategic markets in North America.

"AWS brought us the only network of weather stations that can instantly stream weather data to our traders' desktops. With this tool, we are able to identify and capitalize on wholesale energy trading opportunities across NERC regions more quickly," said Stuart Rubenstein, COO of Constellation Power Source.

Early next quarter, AWS Energy Services will begin shipping the first product in the new suite - MesoStreamer, which tracks and analyzes weather trends in real-time that impact electricity/gas price changes and distribution. All AWS energy products will be powered by the vast AWS WeatherNet network, which includes more than 5,000 automated monitoring stations across the U.S. It is the largest network of its kind - the only one that can reliably measure weather conditions and instantaneously deliver this information and associated analysis to end users. For more information, visit energy.aws.com or contact Jim Anderson, Director of AWS Energy Services, at (301) 258-8390 x148 or via email at janderson@aws.com.

About AWS Convergence Technologies, Inc.

AWS Convergence Technologies, Inc. (www.aws.com) owns and operates the largest network of weather stations in the world. This real-time network gathers comprehensive, up-to-the-second weather information from more than 5,000 communities and powers the company's various products and services, including: WeatherBug(TM), an online weather service that provides live neighborhood conditions to more than nine million PC users; WeatherNet for Broadcast, which delivers real-time weather information to more than 80 million U.S. households through partnerships with 96 local television stations; WeatherNet for Education, which provides engaging weather information and educational tools to schools and colleges, including an innovative set of online lesson plans and software called WeatherNet Classroom; and AWS Data Services which uses AWS' unique weather network and software to provide high-value solutions for vertical industries such as energy, retail, and transportation.