U.S. court upholds power plant cooling water rule

By James Vicini

WASHINGTON (Reuters) - The U.S. Environmental Protection Agency can compare costs with benefits to determine the technology that must be used at power plant water-cooling structures, the Supreme Court ruled on Wednesday in a setback for those seeking greater protection for aquatic life.

By a 6-3 vote, the high court handed a victory to the EPA, Entergy Corp, units of Public Service Enterprise Group Inc and the Utility Water Act Group, which consists of individual energy companies that operate power plants.

The justices overturned a ruling by a U.S. appeals court in New York that the federal clean water law does not permit the EPA to consider the cost-benefit relationship in deciding the best technology available to minimize adverse environmental impact.

Electric power plants use billions of gallons of water each day from bays, rivers, lakes, oceans and other waterways for cooling of their facilities.

The court upheld a rule by the EPA in 2004 that set requirements for intake structures at large, existing facilities in an effort to protect fish, shellfish and other aquatic organisms from being harmed or killed.

The flow of water into the plants traps large aquatic organisms against grills or screens and draws smaller organisms into the cooling mechanism.

The technologies selected by the EPA include relocation of the intakes, fine-mesh screens, velocity caps, larger intakes to decrease the intake velocity and barrier nets.

The rule affected about 550 facilities that account for about 40 percent of the nation's energy production.