In June 2001, the City of Chicago signed an agreement with Commonwealth Edison and the Environmental Resources Trust to purchase 20% of its electricity from clean, renewable resources by the end of 2005. Chicago reached this goal in 2008 with a purchase of 215 million kWh of wind and biomass energy from MidAmerican Energy. The city's plan is to maintain that 20% level for the foreseeable future. As of October 2011, the City was purchasing 20% of their power from renewables. Download the Energy Report
On April 22, 2021 Mayor Lightfoot announced the the city will sign a new contract to power buildings and operations with 100% renewable energy by 2025, with at least half coming from new renewable energy sources in the region.