Mich. Comp. Laws § 460.572
Reasonable and prudent costs for a transmission line for which a certificate is issued shall be included in an electric utility's rates. The commission shall not disallow costs the electric utility incurs in constructing a transmission line for which a certificate is issued, which costs do not exceed the amount set forth in the certificate unless the commission determines that the actual costs were imprudently and unreasonably incurred, based upon substantial evidence presented in opposition to the electric utility's rate request. Costs incurred by the electric utility that exceed the amount set forth in the certificate shall be included in the electric utility's rates, if reasonably and prudently incurred based upon substantial evidence presented in support of the electric utility's rate request.
MCL 460.572