After the Ham Lake fire burned more than 100 buildings along the Gunflint Trail in 2007, many Cook County residents looked differently at the lush pine forest surrounding their homes. All those beautiful trees posed a very real wildfire hazard.
Homeowners began thinning thousands of trees, adopting a strategy known as “firewise.” They hauled the trees and brush to gravel pits and burned them.
“It’s just a lot of material going up in smoke,” Lutsen resident Paul Nelson said as he gestured to a slash pile near Devil Track Lake outside town, easily 25 feet tall and more than 100 feet across.
So Nelson and other members of the Cook County Local Energy Project hatched an idea. Why not harness that wasted energy, and use it to heat buildings in Grand Marais?
That question led to nearly four years of community discussion and detailed analysis of a plan to build a district biomass heating plant, which would burn locally harvested timber to heat water and pipe it underground to the city’s 21 largest customers, including the hospital, schools, county courthouse and the city’s largest private businesses.
It put the town of 1,400 at the leading edge of a growing interest in small-scale community power generation. Elsewhere, communities trying to take advantage of their resources are building solar operations, using methane from garbage and burning agricultural waste.
But, as Grand Marais is learning, making energy locally brings both benefits and costs.
Cook County commissioners set aside $355,000 from a 1 percent sales tax to fund feasibility studies for the biomass heating plant idea. A $250,000 USDA grant is helping pay for a final engineering study and business plan due this fall.
Backers see three big advantages.
Wood to fuel the new system would be harvested from an old, crowded forest, reducing fire risk and rejuvenating the forest. Because most of the county’s heat is now generated from fuel oil and propane, fossil fuels usage would decrease. And Grand Marais would increase its energy self-
*eliance by harvesting a local, sustainable resource and keeping energy dollars in the community.
“We have the opportunity to do something different,” said Grand Marais City Council member Tim Kennedy.
No natural gas
Biomass projects have lost steam elsewhere because of dirt-cheap natural gas prices, driven largely by hydraulic fracturing and other technologies that have drastically increased the domestic supply.
But there aren’t any gas pipelines to Grand Marais and other far northern Minnesota towns such as Ely. The rocky terrain and sparse customer base make the cost prohibitive.
As a result, homes and businesses in Grand Marais heat largely with propane or fuel oil.
It can cost $1,000 in fuel oil to heat the Cook County North Shore Hospital for a single cold winter day, said maintenance supervisor Rory Smith. One of the hospital’s three boilers was installed 45 years ago and needs replacing.
Smith said the price of fuel oil also is extremely volatile. It has risen
253 percent in the past 10 years, according to FVB Energy, which is conducting the engineering and economic analysis of the Grand Marais project.
With a central biomass plant, the hospital would need the boilers only for backup. And the costs probably would be much more predictable. But hospital administrator Kimber Wraalstad is waiting for more information.
“They haven’t given me real pricing yet,” she said. “I remain skeptical until I get on the bottom line here and they get me the real numbers.”
Still, the hospital and the 20 other primary target customers have signed letters of intent to work with the new biomass project.
Air quality concerns
Some community members have raised concerns about potential air pollution from the biomass heating plant. But Kennedy said that fear is based on history and old technology. In the 1970s the high school in Grand Marais installed a wood chip burning plant that “spewed smoke all over the community,” Kennedy said. “That was nothing more than a glorified barrel stove.”
New technology burns much more of the biomass, leaving less to escape up the smokestack. Still, wood fuels do produce higher emissions of some pollutants, including particulates and carbon monoxide, than do more refined fuels such as propane and fuel oil.
The community is considering outfitting the biomass plant with pollution control equipment called an electrostatic precipitator to remove most particulates. According to an analysis by Dovetail Partners, a Minneapolis based nonprofit, that would reduce particulate emissions to 13 percent of uncontrolled emissions.
Old trees, new energy
Off a dirt road in the Superior National Forest, Nelson skidded his pickup truck to a stop to inspect a small logging site where he envisions the wood to fuel a biomass plant will come from. Feasibility studies have demonstrated that the trees and brush cleared for fire protection would not be enough to fuel a central plant.
Logs at the site were stacked neatly to the side. The outsides of the logs were green and healthy, but the centers were clearly rotten.
“The mill wants the stuff that’s solid all the way through,” he said. “This other aspen that’s all rotted out in the center they don’t want, because it’s not productive wood.”
It turns out the forest surrounding Grand Marais is filled with thousands of acres of overage aspen trees that Nelson argues could easily fuel a biomass plant. The U.S. Forest Service estimates there are 56,000 dry tons of sustainable biomass supply within 60 miles. The proposed district heating plant would use 2,700 dry tons a year.
“There’s so much biomass out there in the forest,” said Patty Johnson, fire management officer for the Superior National Forest. She said she hopes the project will lead the way for additional
community-scaled projects across northern Minnesota. A biomass plant, she said, “would give us another tool in our toolbox for treating those areas.”
But it won’t come cheap. The Grand Marais system is expected to cost about $9 million to build.
Kennedy, also a member of the Grand Marais Public Utilities Commission, said the city council passed a resolution in August to request bonding money from the state.
What Grand Marais has had to wrestle with in debating the biomass heating plant, said Kathryn Fernholz, executive director of Dovetail Partners, is that “when you localize things, you end up localizing the good and the bad.”
So with biomass, for example, there will be increased truck traffic to bring the timber to the plant. Some air pollution will be created where the wood is burned, rather than where the propane or fuel oil is refined.
But the benefits also are localized.
“We can do it in a way that’s good for the forest, for the local economy, in a way the air quality is preserved,” said George Wilkes, co-founder of the Cook County Local Energy Project. “It’s going to happen sometime; we just have to keep working on finding the right way to do it.”