Tartu is the capital and largest city of Tartu County in South Estonia. The population of Tartu is around 100,000 people. There are approximately 300 employees in the city government of Tartu, and it is operating under the political leadership of a mayor and 5 deputy mayors. Tartu is considered to be the most liveable city in Estonia. Tartu has been at the forefront of sustainability in Estonia with the most ambitious environmental and sustainability goals. Having started producing heat from sustainable sources in 2009 and having public transportation running on sustainable energy, the city is turning its focus into promoting local sustainable electricity production.