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The Oak Ridge National Laboratory (ORNL) National Hydropower Asset Assessment Program (NHAAP) is an integrated energy, water, and ecosystem research and geospatial data integration effort for efficient, sustainable, and environmentally friendly hydroelectricity generation and water management. Our partners include state and federal agencies, non-governmental organizations, technology and resource developers, utilities, and researchers. ORNL is managed by UT-Battelle, LLC, for the U.S. Department of Energy (DOE).

NHAAP is sponsored by the DOE Office of Energy Efficiency and Renewable Energy (EERE).


A comprehensive energy-water geographic information system (GIS) platform was developed and is managed and used by ORNL to support activities of the US DOE Water Power Program.

The primary objectives of NHAAP are to:

  • Provide an up-to-date comprehensive US hydropower database that includes information on existing hydropower facilities, infrastructure, future resources, hydrography, water availability, and environmental attributes;
  • Perform continual updates and expansion to the NHAAP database to ensure continuous availability of accurate, comprehensive, and up-to-date US hydropower resource statistics;
  • Provide publicly-accessible hydropower data to promote hydropower market acceleration and deployment;
  • Develop tools and datasets to aid in reducing deployment barriers and environmental impacts of hydropower.

Please visit the NHAAP GIS Data & Maps page to navigate to various publicly available GIS services, data sets, map products, resource assessments, and related information.