The Department of Natural Resources amended Mo. Code Regs. tit. 10, §140.8, Certification of Renewable Energy and Renewable Energy Standard Compliance Account. The law is meant to implement Proposition C, Renewable Energy Standard, in which Missouri voters elected to require utility companies to gradually increase their usage of renewable energy annually until 15 percent of the energy used in the state is renewable. http://www.sos.mo.gov/adrules/moreg/current/2010/v35n23/v35n23b.pdf pp. 1807-11.