The head of the Texas Public Utility Commission expressed concern Friday that a new federal air quality rule, set to take effect Jan. 1, will cause disruptions in electric service. If implementation of the Cross-State Air Pollution Rule is not delayed, "I have no doubt in my mind that this rule will result in reliability issues and rolling outages in Texas," Donna Nelson said at the start of the commission's meeting. ... The company says the industry's standard time frame for installing emission controls is several years, but the rule requires compliance in six months. So Luminant, a subsidiary of...