For more than a century, distillers around Tennessee have produced whiskey — some legal, some illegal — using a variety of base products like corn, barley or rye, and a number of different techniques. But under a new law passed by the legislature last year, only one process would lead to genuine Tennessee whiskey: a drink made of fermented mash comprised of at least 51 percent corn, aged in new barrels of charred oak, filtered through charcoal and bottled at 40 percent alcohol, or higher, by volume.

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On Tuesday, two Tennessee legislative committees voted to delay consideration of a new proposal that would roll back some of those requirements. The disagreement centers on the process by which Tennessee whiskey is distilled, and whether a producer has to use pricey new oak barrels every year.

Current law requires those new barrels be used. The bill up for debate, proposed by state Rep. Bill Sanderson (R), would allow whiskey makers to age their products in reused barrels, a process far less expensive than one that requires buying new barrels of expensive American oak year after year.

Supporters of the 2013 law said it was necessary to codify what the industry calls standards of identity, a concrete definition of what makes Tennessee whiskey special — and different from other, lower-quality spirits. But opponents say the law effectively codifies Jack Daniel’s formula.

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“Any place that produces a product, in this case we’re talking about distilled spirits, that has a particular premium to it or particular ways you will make it, has standards to entry,” said Phil Lynch, a spokesman for Brown-Forman, the maker of Jack Daniel’s, Tennessee’s largest whiskey producer. “The standards of identity for Tennessee whiskey are the same that they’ve been, [the legislature had] just never codified them.”

Bourbon, like other spirits that enjoy federal standards of identity, is held to stricter requirements than mere whiskey. A federal law passed half a century ago requires that only beverages of fermented mash of at least 51 percent corn, not exceeding 160 proof — or 80 percent alcohol by volume — produced in the United States and not for export be allowed to call themselves bourbon.

Similarly, scotch whisky is produced only in Scotland in compliance with the laws of the United Kingdom. Cognac may only come from its eponymous region of France. Codifying similar rules for Tennessee whiskey, they say, will protect the industry from low-quality producers who want to create their own product on the cheap (“Whisky” is typically used for products made in Canada, Scotland, England and Wales; “whiskey” is the spelling more typically used in Ireland and the United States).

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But others who want the standards imposed by the Tennessee legislature rolled back see another motive behind the 2013 law: The process codified in state law sounds remarkably like the recipe used by Brown-Forman.

“This is all about my rights. And when you take away any of my rights, I’m going to fight you tooth and nail on it,” said Phil Pritchard, owner of Pritchard’s Distillery in Kelso, Tenn. “Last year, a lot of those rights got taken away from me through a process that was abetted by an employee of Jack Daniel’s for the benefit of Jack Daniel’s.”

Jeff Arnett, Jack Daniel’s master distiller, has been lobbying members of the legislature to keep the 2013 law in place.

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The 2013 law grandfathered in Pritchard’s distillery, which uses new barrels but does not charcoal-filter its product. But the nearly twenty other distilleries in Tennessee, the first of which only began receiving licenses in 2009, cannot legally call their product Tennessee whiskey without both new barrels and charcoal filtering.

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The 2013 rule defining Tennessee whiskey concerns another major player in the distilled spirits industry, Diageo, the London-based parent company of brands ranging from Smirnoff vodka to Baileys to Guinness. Diageo has two products in the mix: George Dickel, the second-largest producer of Tennessee whiskey, headquartered just a few miles up the road from Jack Daniel’s, and Johnnie Walker, the best-selling blended Scotch whisky.

Diageo has positioned itself as the defender of the small distilleries, standing up for the right to make Tennessee whiskey by other methods, even though George Dickel uses new oak barrels to age its product. They say the year-old law actually excludes a lower-priced Brown-Forman product, Early Times, from calling itself Tennessee whiskey.

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“We don’t think there should be a law that says this is how we, or anyone else, have to make whiskey,” John Lunn, George Dickel’s master distiller, said in a statement. Diageo North America executive vice president Guy Smith said the current law “creates an anti-competitive situation that will stifle innovation from skilled Tennessean distillers, both large and small.”

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Brown-Forman, on the other hand, says Diageo is worried about market share — not George Dickel’s, but Johnnie Walker’s. Jack Daniel’s sales grew 5 percent in 2013, though Johnnie Walker sales were flat.

“They’re concerned and they’re trying to do what they can to undermine Tennessee whiskey,” Lynch said.

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Distillers around Tennessee are concerned the year-old rules will prevent them from producing as much whiskey as they could because of a shortage of the new oak barrels. A rainy year in 2013 saturated oak across the eastern United States and made harvesting wood more difficult.

Jack Daniel’s has its own cooperage, in Louisville, Ky., and is in the process of opening another plant just outside of Decatur, Ala. But smaller distillers can’t always find a reliable supply of barrels. Even if they can, new barrels can cost between $150 and $600 each.

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“Jack Daniel’s is not going to be faced with a barrel shortage like the rest of us are,” Pritchard said. “Right now, I’m having a heck of a time finding barrels to meet my own needs, and my own needs are infinitesimal compared to Jack Daniel’s.”

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Above all, the two sides are both fighting to protect the growing industry in their own way. Supporters of the strict definition say they are protecting a brand that can one day compete with other premium spirits, like Kentucky bourbon and Scotch whiskey.

“The Tennessee whiskey category is a premium category. We don’t want Tennessee whiskey to be on the same playing field as Kentucky whiskey. We want it to be on the same playing field as Kentucky bourbon,” said Jeff Pennington, who with his wife Jenny owns Speakeasy Spirits, a craft distiller in Nashville, and who backs the 2013 law.

Opponents say only quality, not regulations, will set Tennessee spirits apart.