EPA finalizes 316(b) power plant water standards

The Environmental Protection Agency (EPA) finalized the 316(b) standards under the Clean Water Act on Monday to protect aquatic life drawn each year into cooling water systems at large power plants.

“EPA is making it clear that if you have cooling water intakes you have to look at the impact on aquatic life in local waterways and take steps to minimize that impact,” said Nancy Stoner, acting Assistant Administrator for Water at EPA.

According to the EPA, the final rule affects 544 existing power generation facilities that withdraw more than 2 million gallons per day of water from U.S. waters and use at least 25 percent of the water they withdraw for cooling purposes.


The rule requires that the location, design, construction and capacity of cooling water intake structures reflect the best available technology for minimizing negative environmental impacts. To ensure flexibility, the owner or operator of the facility will choose one of seven options to meet the requirements with the best technology available. Facilities that use more than 125 million gallons per day are required to conduct studies to determine what controls will be required.

“The electric power industry has worked for years to educate and inform policymakers of the potential impacts of this regulation on customers and the need for a flexible and cost-effective final rule. Based upon our initial review of the rule, we are pleased that EPA has avoided imposing a categorical one-size-fits-all approach to compliance; has embraced significant elements of flexibility; and has acknowledged the importance of weighing costs with environmental protection,” said EEI President, Tom Kuhn. “Compared to the proposed rule, the final rule’s overall compliance costs will be lower; however, the final rule will present significant operational and compliance challenges. We remain concerned that the rule will not provide states with sufficient flexibility to regulate cooling water impacts cost-effectively on a case-by-case basis.”

New units at an existing facility that are built to increase the generating capacity are required to reduce the intake flow to a level similar to a closed cycle, recirculation system. EPRI said in an article that their research showed closed-loop cooling costs were estimated at $100 billion to retrofit 450 power plants four years ago. Those costs are now estimated to be at least $50 million per plant, and the system could cost $2 billion or more per plant, particularly for nuclear facilities.

Richard Myers, vice president for Policy Development, Planning and Supplier Programs with the Nuclear Energy Institute, said NEI will study the rule to see if it is acceptable to the nuclear industry.

“Different water bodies, fish populations, geography and plant engineering require site-specific analysis to determine the most effective measures to protect fish at a particular power plant. A one-size-fits-all requirement imposed nationwide, such as replacing once-through cooling systems with cooling towers, would result in adverse environmental consequences.

“Cooling towers consume twice as much water from the aquatic habitats we want to protect compared to once-through cooling systems,” MYers said. “This fact is very important given projections that much of our country will face a water-constrained future. Technology-based solutions at a power plant’s cooling water intake structure can be highly effective in protecting fish and can accommodate the ecological diversity of the various sites. As the EPA has pointed out previously, solutions like traveling screens, with a collection and return system, are comparable to cooling towers in protecting aquatic life in water bodies used for cooling power plants. These are the considerations that will guide our review of this final rule.”

The national requirements will be implemented through National Pollutant Discharge Elimination System (NPDES) permits.

EPA had delayed finalizing the rule several times since the 2004 Phase II Cooling Water Intake Structure rules were suspended in July 2007 in response to the U.S. Second Circuit Court of Appeals’ decision in Riverkeeper v. EPA. The agency sent a letter to a federal judge saying it would meet the May 16 deadline to finalize the rule, saying that EPA had completed all reviews with industry and environmental groups.

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