Solar power for eco-wineries

2010-01-14 11:29

Angwin - John Conover was looking for the best place to grow Napa Valley's famous cabernet sauvignon grapes. Turns out the same southwest-facing, sunny hillside that gives him great grapes also raises a fine crop of solar panels.

"We wanted to be as green as we can be," said Conover, a partner in the Cade winery, which is on track for Gold certification under the US Green Building Council's Leed (Leadership in Energy and Environmental Design).

Green wine is catching on.

"We're seeing a trend toward more sustainable wineries," said Ashley Katz, spokesperson for the Green Building Council.

The council does not track industries specifically, but Katz said at least four wineries already have received Leed certification and more than a dozen more are going through the process. Wineries with Gold-certified facilities include Stoller Vineyards in Dayton, Oregon, and Hall St Helena in the Napa Valley of northern California.

Meanwhile, solar panels have become a common site across wine country, and some wineries are rethinking water usage. Jackson Family Wines, makers of the popular Kendall-Jackson chardonnay, recently announced it will recycle water used for rinsing wine barrels and tanks, resulting in significantly less water and energy use.

Water

In dry California, which has seen three years of drought, water conversation is the new frontier of winery design, said Roger Boulton, who is helping to create a planned Platinum Leed-certified winery at the University of California, Davis.

"The real question in the future will be how many times did you use the water. And 'one' will not be a good answer," he said.

The university's under-construction teaching winery, privately funded and part of the UC Davis Robert Mondavi Institute for Wine and Food Science, is packed with sustainable operating features, including onsite sourcing and efficient use of both water and energy.

The winery, which aims to be the first to get Platinum certification, the highest level, will be fully solar-powered, including during harvest, the peak period for a winery's energy consumption. Eventually, all water used for cleaning will be from large tanks that will collect rain from the adjacent academic building during the winter and use it throughout the year.

"We want to set an example of what's possible with existing technologies," said Boulton, UC Davis professor of viticulture and enology.

At Cade, which hopes to get its entire facility Gold certified by spring, solar panels cover 60% of the roof, providing more energy than the winery uses nine months out of the year. The panels even run two electric car chargers for use by customers who have plug-in wheels.

"We're thinking of everybody," said Conover with a smile.

Blue jeans

Steel used in the building was recycled - even a beautiful banquet table is made from the beaten and burnished hull of a submarine - and the concrete is 30% fly ash, which is recycled ash from coal-fired power plants.

The insulation? Old blue jeans that were shredded and sprayed into the walls.

Another big energy saver: 1 395m² of caves tunneled into the mountain that provide year-round storage for the wines with no heating or cooling. All landscaping water is recycled; bathrooms feature low-flush toilets, and for the gents, waterless urinals.

Jackson Family Wines, a supporter of the Davis winery, also worked with Boulton and others to create a water re-use programme using a filtration cleaning system that also retains heat. The company recently completed a year-long pilot programme and is in the process of implementing the system at the Kendall-Jackson winery in Sonoma County. Winery officials estimate a water savings of 22.7 million liters a year.

In some ways, what is new is old in the wine industry.

In the days before power plants, wine country pioneers had no choice but to go green. "People built buildings that were aligned with the way the sun tracks in the sky; they aligned their building east-to-west to take advantage of crosswinds," said Conover.

Cade designers took a tip out of that old book, designing the 743m² fermentation building to track daylight and maximise breezes. Only about 55m², the winemaker's office and employee break room, are heated and cooled artificially.

"We've come almost full circle," said Conover.

No telling what the pioneers would think about insulation made of blue jeans.

- AP
Read more on:    solar power
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