Aggreko will be installing 45 megawatts of power - enough to power 450,000 homes - as well as 25 megawatts of heating, 35 miles of cable and 500 electrical distribution panels.
The equipment will support broadcasting, security and VIP logistics along the Parade Route as well as the ceremonies around the Lincoln Memorial in Washington DC next week.
The award of these contracts follows Aggreko's success as the supplier of temporary power at the Beijing Olympics.
The firm has also been selected as supplier of temporary power and temperature control for the 2010 Olympic Winter Games in Vancouver, Canada.
Aggreko chief executive Rupert Soames said: “We are delighted and proud to be entrusted to provide critical power and temperature control for this historic event, which it is estimated will be attended by over two million people, and watched by hundreds of millions more on television.
“We have worked on the last three Inaugurations and they are extremely demanding, requiring large amounts of equipment to be installed in a very short period of time.”