Earlier this month, Cuyahoga Metropolitan Housing Authority officials flipped the switch on one of the largest renewable energy In October 2011, about a year and a half after moving into their new headquarters at 8120 Kinsman Ave. in Cleveland, CMHA officials envisioned a plan to become more self-sustaining while saving money at the same time. In partnership with Cleveland Public Power, Key Bank and Carbon Vision, a renewable energy/project development firm out of Shaker Heights, CMHA built a solar panel field on six-acres of a 12-acre, remediated, post-industrial site next door. Energy from the 4,200 solar panels will help power CMHA headquarters. The $3.3 million-project will save CMHA several million dollars over the life of the solar panels. Carbon Vision will initially lease the land from CMHA. After 15 years, CMHA then has the option to buy the panels outright.