U.S. natural gas producers hope climate-conscious electric utilities and gas exporters will pay a premium for what they say is “greener gas” that has been certified as coming from low-emission operations or from renewable sources such as landfills. EQT Corp, Chesapeake Energy and liquefied natural gas firms Cheniere Energy and NextDecade Corp are among the companies considering low-carbon certifications from groups such as Denver-based Project Canary. Gas certified as “responsibly produced” and contributing less emissions could get up to 5% above market prices, or up to 15-cents per thousand cubic feet (mcf), proponents say. So far, not many customers have been willing to pay the premium — a problem for firms trying to sell lower-carbon versions of fossil fuels. Some European buyers have shunned U.S. shale gas and several U.S. cities including New York and San Francisco have sought to ban new residential gas connections […]