A gas flare at an oil well outside Williston. As the oil is pumped out, gas is released and until this is either piped or trucked away, the gas is allowed to flare off. This wastage is one factor that the local population and regulatory bodies want to curb. The North Dakota fracking oil boom has fuelled the local economy. It is based around the town of Williston, where hydraulic fracturing, also known as 'fracking', has enabled a vast reserve of previously unobtainable oil to be accessed.