Safe Basin Closure

Safely managing coal ash in a changing climate

The scientific studies of coal ash and our basins, dam safety inspections, emergency planning, ongoing environmental monitoring efforts and more – performed by the company and outside experts – are how we protect the environment and the communities we serve.

This information shapes operational procedures, site-specific ash basin closure plans, and projects to enhance climate resiliency. Our approach addresses the operational, environmental, strategic and financial risks associated with effectively managing coal ash today and for decades after basin closure.

All closure plans are engineered to improve groundwater and ensure the long-term safety of ash storage.

Each basin is unique, and that's why each closure plan is customized to the site to ensure it is most effective. State and federal laws outline two main options to close ash basins: capping in place or excavation. In either scenario, water is safely removed from each basin in a way that protects water quality in the nearby lake or river, conducted with the oversight of state regulators. Both options provide benefits to groundwater, though excavation may be appropriate for site-specific reasons.

Duke Energy Ash Metrics Fleetwide