USFilter to provide zero liquid discharge water treatment facility for Calpine Corp.'s Rocky Mountain Energy Center

PLAINFIELD, Ill., April 23, 2003 -- USFilter has been awarded a contract to provide a multi-million dollar turnkey zero liquid discharge (ZLD) water treatment facility for Calpine Corporation's new 600-MW Rocky Mountain Energy Center (RMEC) near Hudson, Colo.

The water treatment system will soften 4,000 gallons per minute (gpm) of raw water for use as make-up to the cooling towers, and will concentrate 390-gpm of cooling tower blowdown with mechanical vapor compression brine evaporators to reduce the volume to the on-site evaporation ponds. The raw water pretreatment system will include two Contraflo( Clarifiers, a thickener, belt filter and chemical feed systems.

USFilter is also supplying the plant's demineralization equipment, which will provide 400-gpm of purified water. This equipment includes multimedia filtration, reverse osmosis and mixed-bed service deionization.

Scheduled for start-up in December 2003, the turnkey system will include all controls, instrumentation, process piping and a programmable logic controller (PLC).

Calpine Corporation is a North American power company dedicated to providing wholesale and industrial customers with clean, efficient, natural gas-fired and geothermal power generation.

It generates and markets power through plants it owns, operates, leases, and develops in 23 states in the United States, three provinces in Canada and in the United Kingdom. Calpine is also the world's largest producer of renewable geothermal energy, and it owns approximately 1 trillion cubic feet equivalent of proved natural gas reserves in Canada and the United States.

United States Filter Corporation, a Vivendi Environnement company, is North America's leading water company providing comprehensive water and wastewater systems and services to commercial, industrial, municipal and residential customers.

Vivendi Environnement (Paris Bourse: VIE and NYSE:VE) is the largest environmental services company in the world with more than 295,000 employees, including FCC, in about 100 countries and annual revenues of more than €28.1 billion ($30.5 billion). Visit the company's web sites at www.usfilter.com or www.vivendienvironnement-finance.com.