Since propane was identified as a volatile compound in gasoline, businesses and scientists have worked thoroughly to make propane the viable fuel source it represents today. The process itself of making propane has evolved over the last century or so. Today, there are two primary ways propane is produced. Because propane is created through the processing of natural gas and crude oil, it is a fuel that is largely a domestic product. In fact, about 90% of the American propane supply is generated right here in the United States! That abundant, right-at-home supply in your propane tank makes propane a reliable fuel choice for your Maine home or business, and all its potential appliances and equipment, throughout the year.