Bloomberg An obscure gasoline additive could lead to a windfall of more than $6 billion for struggling US oil refiners. There’s just one hurdle: the Internal Revenue Service. Fuel makers are examining whether their occasional use of butane — a liquefied petroleum gas — qualifies for a big tax credit under a now-expired law that was intended to promote the ...

Bloomberg Sunrun Inc., the San Francisco-based residential-solar company, surged the most in 10 weeks after Bank of America Corp. said the company expects to be cash-flow positive by year-end. Sunrun gained 6.9 percent to $6.04 at 11:07 a.m. in New York, the most intraday since Aug. 24. The company is expanding into new markets and shifting its financing models so ...

Bloomberg Helium resources discovered in Tanzania last year may be almost twice as large as first thought, helping address possible future shortages of the gas used in medical scanners and nuclear energy when production begins, possibly as early as 2020, the exploration company said. Researchers working with Lisbon-based Helium One Ltd. calculated the Rukwa gas field in southwestern Tanzania could ...