Electricity produced using natural gas in a combined cycle generating plant comes in at $66 per megawatt-hour. If one includes carbon capture and sequestration, basically burying carbon dioxide underground, the cost rises to $89 per megawatt-hour. In contrast conventional coal costs $95 per megawatt-hour rising to $136 using carbon capture and sequestration.
How does natural gas compare with various carbon-free and renewable energy sources? Nuclear clocks in at $104 per Mwh, offshore wind at $243 per Mwh, photovoltaic at $211 per Mwh, solar thermal at $312 per Mwh, geothermal at $102 per Mwh, and biomass at $113 per Mwh. The only renewable sources that are close to competitive with natural gas are onshore wind at $97 per Mwh and hydroelectric at $86 per Mwh. With regard to transportation, the price of compressed natural gas currently hovers around the equivalent of $2 per gallon of gasoline.
Keep in mind that the above is just a thought experiment. Junking coal-fired plants and dramatically expanding natural gas production as well as the infrastructure to burn it to generate electricity and dispense it as transport fuel would be costly. Increased demand for natural gas would also tend to boost its price.More here, including a discussion of why environmentalists now oppose natural gas.