Natural gas has been hailed as the bridge fuel between the fossil fuel economy of the past and present, and the renewables economy of the future. With renewable energy costs falling steadily and considerably, some are beginning to worry that gas is facing increasingly fierce competition amid fast-growing supply. A recent couple of reports from a nonprofit organization promoting renewable energy suggested solar and wind, plus storage, could become cheaper than most gas-fired power plants in the United States in just 16 years. “We find that…