The US Dept of Energy
These different branches of the department came into being with The Manhattan Project. In 1942, under the US Corp of Army Engineers, the program was created to develop the atomic bomb. After World War II, in 1946, President Truman signed the McMahon/Atomic Energy Act, to enable the peace time development of atomic science and technology. The Manhattan Project, no longer a military program, became the civilian Atomic Energy Commission in 1947. The AEC led to the creation of other departments, which were then also consolidated into The Dept of Energy in 1977.
Presently, Dr. Ernest Moniz, The United States Secretary of Energy, is head of the department. He is a nuclear physicist, nominated for the position by Barack Obama, and approved by the Senate in 2013.
Besides the issues of energy conservation and related research, the department handles other United States policies such as the handling of nuclear related weapons and material, nuclear reactive production for the US Navy, radioactive waste disposal, and energy production. The Human Genome Project was started by the Dept of Energy's Office of Health and Environmental Research. The DOE conducts research in its national laboratories and technology centers.
The Office of Energy Efficiency and Renewable Energy's technology programs funds State Energy Programs, SEP, with grants to state energy offices. SEP's are able to offer rebates to consumers to promote the use of energy saving products, renewable energy, energy audits, and energy saving home improvements.
The DOE's website has extensive information on all matters relating to energy; public services, conservation, climate change, science and innovation, energy saving calculators, green contractors, energy saving vehicles, consumer rebates, and current incentive programs. The website is an idea resource, check it out and keep it handy. You're sure to learn something with just one visit.