Last week, with little fanfare and even less debate, Oklahoma lawmakers quietly voted to reverse a nearly four-decade-old law that had barred utility companies from charging customers who install solar panels on their homes more than those who don’t. The bill, which passed almost unanimously, would have effectively cleared the way for utilities in the Sooner State to force homeowners who install solar panels to pay for both the electricity they buy from the grid and for a portion of the electricity they sell back to it.