Energy companies will continue to enjoy a favorable tax structure in Alaska following a referendum vote on a state law that has stirred passions about how generous Alaskans should be to their signature industry. Now both supporters and opponents of the law are looking to see if Big Oil companies will boost production, one of the hotly contested points in whether the law was helping or hurting Alaska's economy. The Alaska Oil & Gas Association says the state has fallen to fourth place in US oil output, after Texas, North Dakota, and California. Republican Governor Sean Parnell signed the controversial bill, dubbed the "More Alaska Production" Act, into law in May 2013, saying it would help reverse declining production in Alaska, which had led to lower state revenue.