The U.S. Department of Energy’s overarching mission is to advance the national, economic, and energy security of the United States; to promote scientific and technological innovation in support of that mission; and to ensure the environmental cleanup of the national nuclear weapons complex.

National Nuclear Security Administration (NNSA) is the country's National Security Enterprise responsible for the management and security of the nation's nuclear weapons, nuclear nonproliferation, and naval reactor programs. It also responds to nuclear and radiological emergencies in the United States and abroad. Additionally, NNSA federal agents provide safe and secure transportation of nuclear weapons and components and special nuclear materials along with other missions supporting the national security.

The Y‑12 National Security Complex is a premier manufacturing facility dedicated to making our nation and the world a safer place. Operated by B&W Y‑12 for the National Nuclear Security Administration, Y‑12 plays a vital role in the Department of Energy’s Nuclear Security Enterprise. Y‑12 helps ensure a safe and reliable U.S. nuclear weapons deterrent. We also retrieve and store nuclear materials, fuel the nation’s naval reactors, and perform complementary work for other government and private-sector entities.

Bechtel Jacobs Company LLC is the environmental management contractor for the Department of Energy’s Oak Ridge Office, located in Oak Ridge, Tennessee. The company is responsible for environmental cleanup and waste management on DOE’s Oak Ridge Reservation. Bechtel Jacobs Company also supports DOE in a reindustrialization program to find commercial uses for many Oak Ridge facilities that no longer have a mission.

Battelle is an international science and technology enterprise that explores emerging areas of science, develops and commercializes technology, and manages laboratories for customers. Battelle supports community and education programs to promote an enhanced quality of life for our community neighbors.

Oak Ridge National Laboratory (ORNL) is a multiprogram science and technology laboratory managed for the U.S. Department of Energy by UT-Battelle, LLC. Scientists and engineers at ORNL conduct basic and applied research and development to create scientific knowledge and technological solutions that strengthen the nation’s leadership in key areas of science; increase the availability of clean, abundant energy; restore and protect the environment; and contribute to national security.

Wackenhut Services, Inc. - Oak Ridge Team is contracted by the Department of Energy and National Nuclear Security Administration to provide para-military protective forces for the Oak Ridge Reservation, which includes the Oak Ridge National Laboratory, the East Tennessee Technology Park, the Federal Office Building Complex and the Y‑12 National Security Complex.

Since 1997 EnergX has provided technical support to government and commercial clients, including the Department of Energy and its contractors. EnergX operates the TRU Waste Processing Center, a Category 2 Nuclear Facility in Oak Ridge, TN. EnergX also manages the Hanford Training Center providing both technical and professional training to all contractors and professional technical support.

Oak Ridge Associated Universities (ORAU) is a university consortium leveraging the scientific strength of 100 major research institutions to advance science and education by partnering with national laboratories, government agencies, and private industry. ORAU manages the Oak Ridge Institute for Science and Education for the U.S. Department of Energy.

Isotek Systems LLC is responsible for the safe removal of U-233 inventory from Building 3019, a Category 2 nuclear facility at the Oak Ridge National Laboratory. The project will be completed in 2015 and involves the uranium processing system design, construction, and operation. Isotek Systems LLC, based in Oak Ridge, Tennessee, is a partnership of EnergySolutions, Nuclear Fuel Services, and Burns & Roe Enterprises, Inc.