BILLINGS - Investigators sifting through the remains of a house Billings obliterated by an explosion Wednesday ruled out an incident caused intentionally, but do not know yet what caused the explosion.
Mike Spini, the fire marshal of the city conducting the investigation, said Thursday afternoon that he may be "several weeks" before officials know what caused the explosion that leveled the home of Gary Woltermann to 1411 Granite Ave.
Investigators strongly suspect a line of natural gas leak caused or contributed to the explosion, he said, but "to what extent we are not sure yet.
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No way to tell for sure without running real numbers, but a useful datum is to know that electricity costs, per BTU produced in an electric resistance heater, about three times as much as the same number of BTU's produced by burning natural gas. This suggests that it may be cheaper to heat just one room. But I like my creature comforts, and would