The US General Services Administration (GSA) is a federal agency that is responsible for managing and supporting the basic functioning of the federal government. The agency was established in 1949 and is headquartered in Washington, D.C. The GSA is responsible for a wide range of functions, including managing government buildings, procuring goods and services for federal agencies, and providing technology and telecommunications services to the federal government.

As the largest landlord in the United States, the GSA is committed to reducing its environmental impact and promoting sustainability. The agency has set a goal to reduce its greenhouse gas emissions by 35% by 2020 and to achieve net-zero energy usage in all of its buildings by 2030. To achieve these goals, the GSA has implemented a number of decarbonisation initiatives, including the use of renewable energy and the implementation of energy-efficient technologies.

One of the key decarbonisation initiatives that the GSA has implemented is the use of corporate power purchase agreements (PPAs) to procure renewable energy. A corporate PPA is a long-term contract between a renewable energy developer and a corporate buyer, such as the GSA, to purchase a fixed amount of renewable energy at a fixed price over a set period of time. By entering into a corporate PPA, the GSA is able to secure a reliable source of renewable energy at a predictable cost, while also supporting the development of new renewable energy projects.

The GSA has signed a number of corporate PPAs for renewable energy, including a 20-year agreement to purchase 120 MW of wind power from the Walnut Ridge Wind Farm in Illinois. The agency has also signed a 20-year agreement to purchase 140 MW of solar power from a solar farm in Utah. These agreements will help the GSA to meet its renewable energy goals and reduce its greenhouse gas emissions.

In addition to using corporate PPAs to procure renewable energy, the GSA is also implementing a number of energy efficiency measures in its buildings. The agency is retrofitting its buildings with energy-efficient lighting, heating, and cooling systems, as well as implementing building automation systems to optimize energy usage. The GSA is also implementing green building standards, such as the Leadership in Energy and Environmental Design (LEED) certification, to ensure that its buildings are designed and constructed to be energy-efficient and sustainable.

The GSA is also working to promote sustainability and decarbonisation in the broader federal government. The agency is responsible for implementing the Federal Green Challenge, which is a program that encourages federal agencies to reduce their environmental impact and promote sustainability. The program includes a number of initiatives, such as reducing energy usage, increasing the use of renewable energy, and reducing waste.

The GSA is also working to promote sustainability and decarbonisation in the transportation sector. The agency is responsible for managing the federal fleet of vehicles, which includes more than 200,000 vehicles. The GSA is working to increase the use of alternative fuel vehicles, such as electric and hybrid vehicles, and to promote the use of public transportation and telecommuting to reduce the environmental impact of transportation.

In conclusion, the US General Services Administration is a federal agency that is committed to promoting sustainability and decarbonisation in the federal government. The agency is implementing a number of initiatives, including the use of corporate PPAs to procure renewable energy, implementing energy efficiency measures in its buildings, and promoting sustainability in the broader federal government. The GSA's efforts are helping to reduce the federal government's environmental impact and promote a more sustainable future.