The Indianapolis Airport Authority (IAA) is a regional government agency that oversees operations at the Indianapolis International Airport (IND) and the Indianapolis Regional Airport (MQJ). The IAA was established in 1962 as a municipal corporation and is governed by a seven-member board of directors appointed by the Mayor of Indianapolis.

The IAA is committed to sustainability and has set a goal to achieve net-zero carbon emissions by 2040. To achieve this goal, the IAA has implemented several initiatives focused on decarbonisation, corporate energy, corporate power purchase agreements (PPAs), and renewable energy.

Decarbonisation is a key focus area for the IAA. The agency has implemented several measures to reduce its carbon footprint, including the installation of energy-efficient lighting, HVAC systems, and building automation systems. The IAA has also implemented a green cleaning program, which uses environmentally friendly cleaning products and practices.

The IAA has also implemented a corporate energy program to reduce its energy consumption and costs. The program includes energy audits, energy-efficient lighting retrofits, and the installation of solar panels. The IAA has installed a 12.5 MW solar farm on airport property, which generates enough electricity to power 1,800 homes annually. The solar farm is the largest airport-based solar farm in the United States and has received several awards for its innovative design and sustainability.

The IAA has also entered into corporate power purchase agreements (PPAs) to purchase renewable energy from off-site sources. The IAA has entered into a 20-year PPA with a wind farm in Illinois, which will provide the airport with 50% of its electricity needs. The PPA is expected to save the IAA $2 million over the life of the agreement and reduce its carbon emissions by 10,000 metric tons annually.

In addition to its corporate energy and PPA programs, the IAA has implemented several renewable energy projects on airport property. The IAA has installed several electric vehicle charging stations, which are powered by the solar farm. The IAA has also installed a geothermal heating and cooling system at the airport's midfield terminal, which uses the earth's natural temperature to heat and cool the building.

The IAA's commitment to sustainability has not gone unnoticed. The agency has received several awards for its sustainability initiatives, including the Airports Council International-North America Environmental Achievement Award, the Governor's Award for Environmental Excellence, and the U.S. Environmental Protection Agency's Green Power Leadership Award.

In conclusion, the Indianapolis Airport Authority is a regional government agency that is committed to sustainability and has set a goal to achieve net-zero carbon emissions by 2040. The agency has implemented several initiatives focused on decarbonisation, corporate energy, corporate power purchase agreements (PPAs), and renewable energy. The IAA's commitment to sustainability has not gone unnoticed, and the agency has received several awards for its sustainability initiatives. The IAA is a leader in sustainable airport operations and serves as a model for other airports and government agencies to follow.