A stink in Central California over converting cow manure to electricity

March 1, 2010 at 1:36 PM Leave a comment

Central California is home to nearly 1.6 million dairy cows and their manure — up to 192 million pounds per day. It’s a mountain of waste and a potential environmental hazard.

But for dairyman John Fiscalini, the dung on his farm is renewable gold: He’s converting it into electricity.

At his farm outside Modesto, a torrent of water washes across the barn’s concrete floor several times a day, flushing tons of manure away from his herd of fuzzy-faced Holsteins and into nearby tanks. There, bacteria consume the waste and release methane, which is then burned in a generator capable of producing enough power to run Fiscalini’s 530-acre farm, his cheese factory and 200 additional homes.

Fiscalini’s resourcefulness should be drawing accolades, considering that state mandates are requiring California industries to boost renewable energy use and slash greenhouse gas emissions sharply over the next 10 years.

But efforts to convert cow pies into power have sparked controversy. State air quality control regulators say these “dairy digester” systems can generate pollution themselves and, unless the devices are overhauled, are refusing to issue permits for them.

The standoff underscores how conflicting regulatory mandates are making it hard for California to meet its green-energy goals.

“We didn’t expect this,” said Michael Gallo, chief executive of Joseph Gallo Farms in Atwater, Calif., whose family has spent “a lot of money” to get its dairy digester system compliant.

The idea of turning biological waste — whether manure, trash or grass clippings — into fuel has been around for centuries. Technologies vary, but the idea is to extract methane from decomposing organic material, remove impurities and burn it for heat, light or transport. Interest boomed after the Kyoto Protocol, the 1997 international treaty on climate change. Methane, considered by many scientists and environmentalists to be as damaging a greenhouse gas as carbon dioxide, was among the key six pollutants targeted.

Today, the European Union is leading the global charge to turn waste into watts; more than 8,000 biogas operations are up and running in Europe, and thousands more are slated to open in the next decade. The United States, which has not ratified the Kyoto accord, has only about 150 digester projects operating at livestock farms nationwide, said Chris Voell, a manager of the U.S. Environmental Protection Agency’s AgStar program, which works with farmers to get such systems up and running.

Funding is an issue. Government subsidies aren’t as readily available in the U.S. as they are in Europe. Just 16 digesters were operating at California dairies last year, fewer than in Wisconsin (which had 19) and Pennsylvania (18).

“California has about four times as much potential for emission reductions and energy generation as the next-largest dairy state,” Voell said. “I know the regulations are much more strict in California. But there’s so much potential there.”

Air regulators say they understand why farmers are frustrated but point out that methane is not the only worrisome gas that pollutes. Like an internal combustion engine in a car, the generators used to convert the methane into electricity produce nitrogen oxides, or NOx.

NOx exacerbates the state’s smog problem, particularly in the San Joaquin Valley, which has some of the country’s dirtiest air. NOx levels for the valley are federally set. In the San Joaquin Valley, officials at the area’s air pollution control district say it is their job to enforce these rules and curtail ozone pollution.

That stance has come as a shock to dairy farmers such as Fiscalini, whose $4-million digester system was set up out of frustration with regulators wanting him to fight pollution. Time and again, he said, he’d been told by regulators and read in local newspapers that dairy farmers must curtail methane emissions. Fiscalini believed that such digester systems, especially ones that converted the waste into electricity, would eventually be mandatory.

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Entry filed under: composting, Conservation, Energy, Green Tech. Tags: , , , , .

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