"Just as we do with exports of grain, cars, and other American products, by exporting LNG, we can create economic value that would not have existed otherwise," Williams told the audience.
XTO has a lot to gain from exports. It is a subsidiary of Exxon Mobil Corp., the nation's largest producer of natural gas, whose price has plummeted in the last few years because the shale-gas revolution is producing more gas than U.S. markets can absorb.
Exxon Mobil in August submitted an application to the Federal Energy Regulatory Commission to export LNG from a terminal it co-owns in Sabine Pass, Texas. It's one of seven facilities nationwide seeking federal approval to export.
Producers embrace the idea of exporting natural gas, which would increase demand, boost prices, and spur more production. Exports would mean more American jobs producing gas. The income would also improve America's balance of trade.
But proposals to build more LNG export terminals are controversial.
Some American chemical producers fear that shipping LNG to foreign consumers would make gas scarce here, just as the industry is undergoing a revival thanks to abundant supplies of natural gas, a principal raw material.
American Public Gas Association, the trade group for utilities like Philadelphia Gas Works, have said that exports would produce "predictable and disastrous" results for household consumers.
Environmental groups like the Sierra Club have opposed new export terminals because they would induce more drilling, causing more environmental impact.
Others appeal to patriotic sentiments to block exports. T. Boone Pickens, who wants to replace imports of crude oil from unfriendly nations, thinks it would be folly to export natural gas.
The Energy Department is studying the economic effects of expanding LNG exports, but Reuters reported last week that the Obama administration delayed the release of the report until after the election.
In an interview last week, Williams said there was plenty of natural gas supply to meet domestic demand and to export.
"The question is, do we want those additional jobs?" said Williams, a career employee with Exxon Mobil, a company famous for its longterm vision and executives who don't make rash statements.
"The important thing is, we can do it all," he said. "It's not an either-or. We can support plenty of gas for American consumers in terms of electricity generation or heating our homes or our manufacturing sector, for niche applications in the transportation sector, and for export. We can do all that."
Williams' belief is based on confidence that the nation's oil and gas reserves have grown dramatically because of the shale revolution. The combination of hydraulic fracturing and horizontal drilling has opened up huge reserves in "unconventional" formations previously thought unproductive.
"We have a hundred years of natural gas supply in this country, and that's a snapshot today," said Williams, who took over XTO after Exxon bought the shale producer in 2009 in what amounted to a $31 billion endorsement of unconventional drilling.
But Williams says the current reserve estimates just may prove to be low. He has an enduring faith in the industry's ability to devise new solutions.
"This whole phenomenon has been unlocked by technology, creativity, and innovation," he said. "And who's to say that's going to stop?
"Those estimates of oil and gas, they've moved all over the place over the years. As technology develops, there's no telling how high those numbers will go."
Contact Andrew Maykuth at 215-854-2947, @Maykuth on Twitter or firstname.lastname@example.org