The Michigan Public Service Commission on Oct. 24 approved DTE Gas Co.’s second round of federal tax cut refunds that will be reflected on customer bills from January 2019 through June 2019, resulting in a $2.21 cut in monthly residential bills. The first round, called Credit A, was approved in May, lowering monthly bills by $2.12 starting July. The commission established a three-step process to address the short- and long-term impacts of the federal tax law, which slashed the corporate income tax rate to 21 percent from 35 percent effective Jan. 1. The second round or Credit B calculations determine refunds from Jan. 1 until the date when the Credit A was reflected in customer bills, while the third adjustment quantifies the impact on customer bills of long-term items that have not been considered in the prior steps. So far, the commission has ordered $32.6 million in Credit B refunds, in addition to $379.5 million in Credit A rate cuts for utility customers. DTE Gas is a subsidiary of DTE Energy Company.