What should be done with America’s natural gas surplus? Use it instead of high-priced gasoline to fuel cars? Export it? Or just sit back and enjoy the lower prices for industrial and private consumers?

The debate is getting renewed urgency with the federal approval on Monday of a big new liquid natural gas (LNG) export terminal in Sabine, La. – and a conga line of 10 other applicants for their own export permits.

Prominent industrial users of natural gas are rushing to oppose any phalanx of new LNG export terminals, because the result would likely be a significant jump in natural gas prices for them – and for residential consumers, several studies show.

"Rapid increases in export levels lead to large initial price increases that would moderate somewhat in a few years," the Energy Information Administration reported in a study on the impact of various LNG export scenarios in January.

In its analysis, the agency concluded that exports of 12 billion cubic feet of gas each day would raise the price paid by the largest industrial customers in 2018 by 36 percent to 54 percent compared with scenarios in which there were no exports.

As a result, natural gas bills paid by residential, commercial, and industrial consumers would increase by up to 9 percent, and electricity prices would bump up by up to 3 percent, compared with no-export scenarios, the EIA found.

“By anyone’s measure, these are substantial cost increases,” said Paul Cicio, president of the Industrial Energy Consumers of America, in a statement in January after the EIA report was released. Decisions to approve export terminals "must be on an informed basis. Not a rubber stamp approval process," his group said in a statement.

Other private studies have put the increases both far higher – as well as far lower. There would be some domestic benefits from a price rise, some say. Jobs would be created, as large LNG export facilities are built and operated. Price increases would presumably drive new exploration. With today's prices fluctuating under $2 per thousand cubic feet, less than a quarter of where it was when it spiked four years ago – there's little incentive to drill or produce gas, industry officials say.

"There's more gas than we know what to do with," Charif Souki, CEO of Cheniere Energy Partners, which proposed the Sabine export facility, said in a March interview with Energy and Environment Daily television. "There's a number of wells that have not been connected because there's no place to send the gas, so sometimes too much of a good thing is too much."

Even so, the political optics might not support those calling for exports. First, EIA’s projections have already given pause to Department of Energy policymakers, who must determine if natural gas exports destined for nations that are not already signatories of a free-trade agreement with the US are in the public interest, energy analysts say.

"Some policymakers in both parties … do not want to impose new costs on voters or employers," writes Kevin Book, energy analyst at ClearView Energy Partners, a Washington-based energy research firm in a recent LNG analysis. "EIA’s projections may give these policymakers reasons to question or oppose pending DOE export licenses on economic and energy security grounds."

In March, for instance, Sen. Ron Wyden (D) of Oregon, called for a "timeout" on natural gas exports. In February, Rep. Ed Markey (D) of Massachusetts, proposed legislation to ban the export of gas extracted from public lands and freezing new export applications until 2025.

LNG producers say exports would benefit the US.

"We have an overabundance of natural gas supply dwarfing demand," says Bill Cooper, president of the Center for Liquefied Natural Gas, a trade group representing LNG shippers, producers and terminal operators, in an interview. "To allow companies to export that when domestic need for this excess supply is not there, helps our balance of trade, brings wealth into the US, jobs, and dollars to local and state governments. So, yes, our position is that LNG exports certainly are consistent with the public interest."

But other natural gas companies – those delivering the product to customers – are distinctly less enthused. The American Public Gas Association, which represents small, often not-for-profit gas systems owned by municipalities and other public entities, opposes all of the proposed LNG facilities.

It's just not clear that there's as much gas in the ground as proponents predict, says Dave Schryver, executive vice President of the APGA, noting that shortly after the EIA released its LNG export in January, the agency released another study with a new, substantially lower estimate for the nation's shale-gas reserves.

There are 482 trillion cubic feet of shale gas in the US, the EIA reported in January, 40 percent less than its 2011 estimate of 827 trillion cubic feet. A big reason for the drop involved a revision of the Marcellus region, a shale formation beneath New York, West Virginia, Pennsylvania, and Ohio that EIA now says holds 141 trillion cubic feet of gas – not the 410 trillion cubic feet it estimated the year before.

"We think given that EIA study and the uncertainty surrounding the amount of shale gas that we need to go slow on exporting LNG," Mr. Schryver says in an interview. "We'd like to see jobs created in a natural gas vehicle fleet and infrastructure. We feel that would be far more beneficial and better for our nation's domestic energy security."

Lawmakers are hearing from their big constituents, too. Since last summer, influential industrial customers have been laying political groundwork to argue their own sectors would suffer job losses from any policy that raises gas prices, wrote ClearView’s Mr. Book in a recent analysis.

"Intuition and logic may matter less than emotion," Book writes. "Energy prices are an emotional issue during the best of economic times, and high unemployment will make it harder for lawmakers to defend exports during an election year, if opponents choose to attack them."

Environmentalists, meanwhile, note that according to the EIA study, increased exports could set back plans to broadly replace coal-fired power plants that emit the bulk of greenhouse gases with far cleaner, natural-gas-fired turbines.

The same EIA report, they note, found that in scenarios with increased natural gas exports, most of the decrease in natural gas consumption occurs in the electric power sector. "Increased coal-fired generation accounts for about 65 percent of the decrease in natural-gas-fired generation," the report found.

Environmentalists, including the Sierra Club and Riverkeeper, have filed legal briefs opposing various LNG export terminal applications, arguing that exports of US shale gas produced by hydraulic fracturing means a lot more fracking to meet future demand – with unknown and long-lasting consequences for ground water and energy generation.

The Federal Energy Regulatory Commission “refused to consider the damages that will accompany additional gas production, willfully ignoring the health of millions of Americans who will be affected by reckless fracking," Sierra Club Executive Director Michael Brune said in a statement.

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The next big shoe to drop on LNG exports is a big DOE study of the macro-economic impact of LNG exports. Initially slated to be released in March, it's now expected in late summer and could take longer for such a contentious issue.

"Before making any decisions on the pending LNG export applications, the department will take time to review the study results and develop a path forward for making individual public interest determinations," a department official says on condition of anonymity. "No timeline has been set for making those determinations."