December 7, 1999

NATIONAL POWER PLC PURCHASES CORPORATE LICENSE FOR CHEMICALOGIC'S STEAMTAB QUAD

Woburn, Massachusetts, U.S.A. -- December 7, 1999 -- ChemicaLogic Corporation, the leading supplier of spreadsheet engineering software for the process industries, today announced an agreement with one of the leading independent power generating companies, National Power, PLC (NYSE: NP). National Power, based in the U.K., will use ChemicaLogic's SteamTab Quad software as the basis for the thermodynamic and transport properties of water and steam in National Power's generating facilities worldwide. This agreement, signed in November 1999, signifies the continued expansion of ChemicaLogic's SteamTab presence in the power generation industry. ChemicaLogic pioneered the concept of obtaining accurate steam and water properties in spreadsheets by the introduction of SteamTab V1.0 in 1995.

SteamTab Quad, published in December 1998, contains 4 sets of universally recognized formulations for calculating the properties of water and steam. These formulations include:

• Two sets of scientific formulations – the new IAPWS-95 and the older NBS/NRC-84 - typically used for the design and rating of process equipments, and
• Two sets of industrial formulations – the current IAPWS-IF97 and the obsolete IFC-67 - typically used for real time monitoring and for industrial contracutal purposes.

These formulations are efficiently packaged with a user-friendly interface available directly within Excel and Lotus 1-2-3. SteamTab Quad provides an unparalleled ability to not only quickly and accurately model any steam related process, but allow comparison of the results using previously acceptable formulations. With proprietary computational algorithms, these rigorous formulations are executed at superior computational speeds reducing the run time in complex process simulations or real-time monitoring applications.  

Manufacturers of steam equipment have historically used "fudge factors" to compensate for differences between calculated and measured performance of steam systems. A portion of the difference could be attributed to deviations of steam property formulations from real properties. With the recommended change of contractual basis (from IFC-76 to the new IAPWS-IF97), equipment manufacturers will save significant amount of effort by using SteamTab Quad. SteamTab Quad can make easier the tedious task of:

• Validating the design/rating programs with both sets of new formulations (scientific and industrial) to determine the equipment performance on the technical and contractual basis, and
• Comparing the results against the previous standard (IFC-67) in order to upgrade the "fudge factors".

Additional information on these new formulations and their impact is available at:

• The International Association for the Properties of Water and Steam
• Rebuilding Steam Tables

About National Power

National Power's principal business is the generation and retail of electricity. They build, invest in, own, operate and maintain power stations around the world. Since privatization in 1991, the company has been transformed into one of the world's leading independent power companies.

National Power's UK and overseas generation portfolio comprises over 40,000 megawatts with power plants in 12 countries - enough capacity to supply 40 million people. Also in the UK, they have a 2.7 million customer energy retail supply business.

Growing international equity investments now total around £2.6 billion, giving them interests in around 23,000 megawatts of capacity overseas.

The generating technologies they use range from coal and oil-fired plants to new generation cleaner-burn combined cycle gas turbine stations, cogeneration plants, hydro and wind power stations.

National Power is listed on the London and New York Stock Exchanges (NYSE: NP) and has around 800,000 shareholders. Measured by market capitalization they are one of the UK's top 100 companies.

Home page: http://www.national-power.com/

About ChemicaLogic

Since 1995, ChemicaLogic Corporation, a technical and management consulting firm, has been serving the worldwide chemical and allied industries. We fully integrate technical expertise, business knowledge, management experience and computer skills to provide you with a unique resources for problem solving.

ChemicaLogic also develops custom software tools. Our products are benefiting industry leaders in power plants, utilities, chemical manufacturers, engineering firms, and universities. Please inquire with us how these tools might be helpful in improving your productivity.

Contact

Please contact Gordon C. Cheng, ChemicaLogic Corporation, 99 South Bedford Street, Suite 207, Burlington, MA 01803 USA, Tel: (781) 938-1151, gcheng@chemicalogic.com with questions about this press release.

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