This reminds me of a 1970's Boy Scout visit to the local power plant. It had a coal and a gas fired boiler, and the tour guide mentioned that that night, the g

This reminds me of a 1970's Boy Scout visit to the local power plant. It had a coal and a gas fired boiler, and the tour guide mentioned that that night, the gas company had asked them to preferentially use gas, as I recall the guy said the pressure in the pipelines was getting high.