The Big Green Blog Post


When I was a kid, my mom had an old green Volkswagen bus, you know, similar to the one in Scooby-Doo; the iconic hippie-mobile. At the time I was really embarrassed by my mother’s eccentric taste in automobiles, but looking back it made perfect sense. The beads in her hair, the penchant for woodworking, and the green VW bus all pointed to one thing—she was a TOTAL hippie. Naturally, hippies were the first thing that came to my mind when I saw The Big Green Bus pull into our parking lot here at Stone on Wednesday afternoon, leaving a pungent aroma of hash browns in its wake.

The Big Green Bus

The Big Green Bus

The Big Green Bus is a full-size bus (1989 MCI Motorcoach, to be exact) remodeled by 15 Dartmouth students to be as sustainable and energy efficient as possible. The students are taking their green labor of love on a summer-long cross-country tour to raise awareness about sustainability and energy-efficient practices. And it smells like hash browns because it runs on 100% recycled vegetable oil, not because the students have a deep affinity for breakfast fare.

At first glance, The Big Green Bus looks like a glorified version of my mom’s old green VW bus, but that couldn’t be father from the truth. “We spend a lot of time convincing people that we’re not gross-smelling hippies,” said one student, “most of us showered this morning.” The Big Green Bus is much more than a meagerly-funded flower-child mobile with wicked green graphics. Along with running on biodiesel, the bus is also a mobile showcase of environmental conservation. Everything inside, from the low-energy plasma TV to the recycled bamboo flooring, is the epitome of energy efficiency.

Anna, a Dartmouth sophomore from the Big Green Bus, being interviewed for the local news. The Big Green Bus is greeted by cameras wherever they go.

Anna, a Dartmouth sophomore from the Big Green Bus, spreading her message on the local news. The Big Green Bus is greeted by cameras wherever they go.

If a summer-long tour on The Big Green Bus sounds like a great time, think again. These kids work hard. According to Kerry, it’s about 90% work and 10% play. Not exactly your quintessential summer of love. Everywhere the students go they’re greeted by news cameras and general media hubbub, and Stone was no exception. Escondido Mayor Lori Pfeiler, the folks at the California Center for Sustainable Energy, and a bevy of local media joined us in welcoming them to Stone on Wednesday afternoon.

So why did they come to Stone? Because they were hungry, of course (I guess word got out that our Bistro serves locally-grown, organic food). They also enjoyed a tour of the brewery and learned a bit about our solar array and our other efforts to operate sustainably. But most importantly, they came to fill up their tank with our Bistro’s used vegetable oil—the same stuff that our Lead Brewer John Egan uses to power his truck.

Mayor Lori Pfeiler and the folks from the California Center for Sustainable Energy joined us in welcoming the hard-working crew of 15 Dartmouth students

Mayor Lori Pfeiler and the folks from the California Center for Sustainable Energy joined us in welcoming the 15 hard-working Dartmouth students.

We’re stoked The Big Green Bus chose to stop and share a part of their journey with us, and we’re glad we could help spread their message. If you spy a lumbering green bus speeding down the highway smelling like Sunday brunch at iHop, give those hard-working Dartmouth students a honk in support. They deserve it.

-Matt Steele

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For eons the sun has perched brightly in the sky casting nurturing rays of light, heating our quaint little blue globe and making life possible. But every once in a while, we begrudge our beloved burning ball of gas for ruining the one thing many of us love most in life—BEER.

Yes it’s true; UV light can skunk even the stoutest beers. Most astute brewers and beer drinkers are well aware of this, and take preventative measures to reduce the amount of light that penetrates their beer. If you’ve taken one of our brewery tours, you’ve no doubt heard us lambaste the ill effects of UV light on beer, making a point to mention that, unlike some breweries, we use dark brown bottles to counter this effect. While we do safeguard our beer against UV light, we actually embrace light (specifically sunlight) in another, more practical way. How’s that? Two words: Solar Array.

Our 276.9-kilowatt AC Photovaltaic Solar Array. Beautiful, huh?

Back in February 2008 we had a 276.9-kilowatt AC photovoltaic solar panel system installed on the roof of our building. The $2.6 million dollar system includes 1,561 200-Watt Photo-Voltaic Modules, and produces about 30% of our brewery’s total electricity.

Rob Marshal

Although our system has a 331-kilowatt capacity, the amount of energy generated varies day to day, depending heavily on weather patterns and the amount of dirt build-up on the panels. Even with these minor limitations, our solar panels generate an impressive amount of energy. Rob Marshal, our IT Analyst, keeps track of our solar array data, and he provided me with all the juicy numbers.

Construction on our solar panels completed in May 2008, but they weren’t operational until June 2008, and they weren’t fully online until September 2008. With that in mind, our solar panels generated 243,393 kWh (Kilowatt Hours) of energy in all of 2008. The panels have generated a grand total of 316,146 kWh over the past six months.

A screen shot from Rob's computer.

The most power that our solar panels have ever generated in one day is 1,739 kWh. That was back on September 2, 2008, an arguably sunny day. To give you some perspective, at that rate we could generate 10,656 kWh in one week, which would power the average American household for an entire year. Even more impressive, our panels generated 95,390 kWh during the entire month of September, 2008. On the other hand, cloudier, drearier months like February see a drastic dip in energy production. The panels generated 29,680 kWh in February, averaging only 1,060 kWh a day. This is a direct result of meager sunlight and dirt buildup over the lifespan of the panels.

Less stellar numbers for a gloomy San Diego February

Less stellar numbers for a gloomy February in San Diego

While solar power can be incredibly effective, it isn’t exactly the infallible cure-all for our planet’s energy woes. As mentioned earlier, it’s overly dependent upon clear weather, and dirt buildup is problematic. Not only is it time-consuming and costly to clean the panels, but the run-off doesn’t meet storm drainage standards, and we’re still working on a solution to this environmental catch 22. As you know, going solar requires a significant initial investment that may not start paying off for many years. In our case, we won’t start reaping the benefits for about 6-8 years. However, we’ve decided that the long-term benefits will far outweigh the initial cost.

According to Hamann Construction, our system is one of the largest in the state, placing in the top 12% of solar systems in California, but we’re not the only brewery rectifying the once rocky relationship between beer and the sun. Sierra Nevada Brewery in Chico, California, recently installed a 1.3-megawatt solar power system which provides about 34% of their brewery’s power.

As our industry continues to battle the dangers of dirty energy, breweries are exploring options beyond solar power to reduce their carbon footprint. Harpoon Brewery in Boston, for example, is taking advantage of the trend among utility companies to pay breweries for relieving stress on their grid by using less power. Making such seemingly minor changes as using more efficient light bulbs and installing light reflecting mirrors has saved them money and lifted some of the burden off of their local utility company. Measures like this, along with a myriad of government incentive programs, are making clean energy more attainable for small breweries.

Of course, we had our fair share of help. Harnessing the power of the sun wouldn’t be possible without assistance from a few upstanding organizations. The California Center for Sustainable Energy (CCSE), a government program that offers incentives to homes and businesses for going solar, facilitated our participation in the California Solar Initiative (CSI), which was pivotal in assuring the financial feasibility of the project. Bank of America, with their innovative financing for green energy projects also played a crucial role. Lastly, our contractors Borrego Solar Systems, Inc. and Hamann Construction both did a fantastic job, and we’re very satisfied with the end result.

Our push for clean energy represents another step towards sustainable design, which was our goal from the beginning. Our solar array, along with other conservation initiatives at our brewery and restaurant, helps us make great beer with minimal impact on the environment. Thankfully, we’re not alone. We’re proud to be part of an industry that is leading the charge for sustainable energy and environmentally responsible business practices.

-Matt Steele