FORT WORTH - U.S. Bankruptcy Judge Michael Lynn of Fort Worth denied federal regulators the power to force bankrupt Mirant Corp. to honor discounted contracts to deliver wholesale electricity to Washington, D.C., and its suburbs. The ruling Wednesday, which is without precedent, continues an injunction that prevents the Federal Energy Regulatory Commission from forcing Mirant to honor contracts to Potomac Electric Power Co. Mirant of Atlanta, Ga., filed its bankruptcy case in Fort Worth in July and began taking steps to dissolve contracts. Potomac Electric asked energy regulators to intervene to prevent Mirant from abandoning long-term contracts to sell power...