On November 21, 2019, the City of Cincinnati, Ohio announced that it will construct the largest municipal solar array—100 MW—in the country. Of the 100 MW, 35 MW will serve the City of Cincinnati facilities by December 2020 and the other 65 MW will benefit residents of the city through the Cincinnati Electric Aggregation Program in December 2021. The project will reduce the region’s annual carbon emissions by 158,000 tons. Cincinnati was one of 25 cities to have been accepted into the Bloomberg American Cities Climate Challenge two-year program, which will assist the cities in meeting their near-term carbon reduction goals. For the project, the city entered a power purchase agreement (PPA) with Creekwood Energy and Hecate Energy, two Cincinnati-based clean energy developers. The city is offsetting the financial risks associated with building solar arrays by entering an agreement where developers will take up the construction costs. The agreement specifies that the city will be able to purchase electricity at a fixed rate for the full 20 years of the contract. The PPA was facilitated by Bloomberg’s partners, the World Resources Institute and Rocky Mountain Institute’s Renewable Accelerator.

References：
https://www.cincinnati-oh.gov/mayor/news/cincinnati-to-construct-nation-s-largest-city-led-solar-project/
https://www.bloomberg.org/program/environment/climatechallenge/#overview