The City of San Diego Environmental Services Department (ESD) is a government agency responsible for managing the city's waste, recycling, and environmental programs. The department's mission is to protect the environment and public health by providing sustainable waste management services, promoting recycling and waste reduction, and supporting the city's efforts to reduce greenhouse gas emissions.

In recent years, the ESD has been at the forefront of the city's efforts to decarbonize its energy supply and reduce its carbon footprint. The department has implemented a range of initiatives to promote renewable energy, energy efficiency, and sustainable transportation.

One of the key strategies that the ESD has adopted to reduce the city's carbon footprint is the use of corporate power purchase agreements (PPAs) to procure renewable energy. A corporate PPA is a contract between a corporation and a renewable energy provider, in which the corporation agrees to purchase a specified amount of renewable energy from the provider over a set period of time. By entering into a corporate PPA, the ESD is able to secure a long-term supply of renewable energy at a fixed price, which helps to stabilize the department's energy costs and reduce its exposure to volatile fossil fuel prices.

The ESD has also implemented a range of energy efficiency measures to reduce the amount of energy it consumes. These measures include upgrading lighting and HVAC systems in city buildings, installing energy-efficient appliances and equipment, and implementing energy management systems to monitor and control energy use. By reducing its energy consumption, the ESD is able to lower its carbon footprint and save money on energy costs.

In addition to promoting renewable energy and energy efficiency, the ESD is also working to promote sustainable transportation in the city. The department has implemented a range of initiatives to encourage the use of public transportation, cycling, and walking, including the installation of bike lanes and bike parking facilities, the promotion of carpooling and ride-sharing, and the provision of incentives for employees who use sustainable transportation options.

Overall, the City of San Diego Environmental Services Department is a leader in the city's efforts to decarbonize its energy supply and reduce its carbon footprint. Through the use of corporate PPAs, energy efficiency measures, and sustainable transportation initiatives, the department is helping to create a more sustainable and livable city for all residents.