Safe Basin Closure

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State and federal laws outline two main options to close ash basins: capping in place or excavation. In either scenario, water will be safely removed from each basin in a way that protects water quality in the nearby lake or river. Both options provide benefits to groundwater, though excavation may be appropriate for certain technical reasons. Each basin is unique, and the closure plan should be customized to the site to ensure it is most effective.

Progress in Closing Coal Ash Basins Safely
Duke Energy Ash Metrics Fleetwide




Independent experts

Independent experts, including a national advisory board, engineers, scientists and dedicated teams at Duke Energy, are spending thousands of hours studying data, building enhanced groundwater and surface water protection programs and identifying closure options that protect people and the environment in a cost-effective manner.

The National Ash Management Advisory Board (NAMAB) is led by Dr. John Daniels, P.E., a former program director at the U.S. National Science Foundation and current professor and chair of the Department of Civil and Environmental Engineering at the University of North Carolina at Charlotte.

Working with Duke Energy engineers and scientists, NAMAB developed a set of guiding principles for safe basin closure. These principles provide a sustainable framework for promoting recycling, protecting groundwater and minimizing impacts to local communities and the environment, while safely anticipating major storms, flooding and even seismic events.

Guiding Principles for Ash Basin Closure

Protecting public health and safety

Duke Energy is committed to operational excellence and protecting the environment and public health and safety. Environmental Compliance Plans



We routinely monitor water quality and fisheries' health near our ash ponds to ensure the environment is protected. This guide for private well owners provides answers to some of the most common questions asked by those who obtain their water from private wells.



Read more about our North Carolina comprehensive groundwater studies.



State and federal laws outline two main options to close ash basins: capping in place or excavation. In either scenario, water will be safely removed from each basin in a way that protects water quality in the nearby lake or river. Both options provide benefits to groundwater, though excavation may be appropriate for certain technical reasons. Each basin is unique, and the closure plan should be customized to the site to ensure it is most effective.

Progress in Closing Coal Ash Basins Safely
Duke Energy Ash Metrics Fleetwide