Markham community will use geothermal in all its homes, but some critics aren't hot on it

A neighbourhood being planned in Markham will be the first in Canada to connect all itshouses toa geothermal energy system -- which will harnessthe heat from deep within the earth to not only to warm, but cool the homes.

Construction on the new community of Berczy Glen,planned in the area of Elgin Mills and Warden avenues, won't begin until 2020 at the earliest, but the partners behind the ambitious plans were announced this week.

The city of Markham, Mattamy Homes andEnwave Energy Corporationplan to build the 300-home community,which will use what's known as a district geothermal system, the largest of its type currently proposed in Canada.

"I'm very excited about it. I think everybody should be excited about it," said Subhi Alsayed, the vice president of, sustainable development for Mattamy Homes.

Geothermal technology has been around for decades, he said.

It essentially uses the heat of the earth deep beneath the surface to regulate temperature, and is considered one way for homesto work toward a "net zero" energy footprint meaning theyproduceat least as much energy as theyconsume.

Geothermal works on the same principles as a refrigerator or air conditioner. Tubes filled with liquid refrigerant absorb heat frombeneath the ground to help heat the homes in the the winter and it acts as a heat sink to help cool the homes in the summer.

That makes the home more energy efficient, because in Canada most energy consumption is related to heating and cooling homes.

But Tom Adams, an independent energy analyst,researcher andformer executive director of Energy Probe, is skeptical.

"This is one of those things that I wish would really work," he said. "But I think we need to be kind of chastened by history."

Adams says in places where there is more geothermal activity, such as Iceland or parts of California, it completely makes sense.

However, experiments with the technology in Canada have been less successful.

"There's been a tremendous amount of research that's been done on these things becausethe theoretical potential is there," Adams said.

"But when the practicalities come to bear, it turns out that it's a lot harder than many of the advocates had hoped."

But Alsayed said the plan doesn't really hinge onone single technology.

"I mean, geothermal is a cool technology. But, in my opinion, the innovation here that we're bringing to the industry is not just in the geothermal system, it's in the business model that we're introducing to the market," he said.

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Alsayed said partnering withEnwave Energy, a company with experience indistrict and community energy systems to install and operate the geothermal system and supply heating cooling and domestic hot water to all the homes, is a groundbreaking concept.

"We think this business model is going to enable whatever technologies are going to come down the road, because honestly, today we think that geothermal is cool, but there's other technologies that we don't even know of," he said.

Alsayed said other communitiesshould be watching the project, since provincial and federal governments are considering net-zero construction standards by 2030.

Fernando Carou, manager of community energy initiatives at City of Toronto, says a new civic centre plannedin Etobicoke will use geothermal, as well, sewer heat recoveryandsolar for heating and cooling.

And he says there's a common misconception about the term geothermal and confusion about how it works.

"Unlike Iceland we truly don't have geothermal -- we're not drilling you know three kilometresdown and finding hot water," says Carou. "What we're doing actually is we're usingthe constant temperature of the earth."

That meansheating a building is not done from scratch, but rather moving the energy from the ground to the building to provide a baseline temperature in the winter and then returning the heat to the ground from the building in the summer.

"So essentially the groundbecomes a natural source of energy for the winter and it becomes a sink of heat in the summer when we want to cool the building," said Carou.

He says the New Etobicoke Civic Centre Precinct, also known as the six points intersection whereBloor, Dundasand Kipling meet, will incorporate a geothermal system along with otherrenewable energy sources to reduce carbon emissions.

"It's a more efficient way to heat -- it's extremely efficient and ultimatelywe're displacing thejob of natural gas or otherfossil fuels and that's exciting," he said.

Carousays when completed, six points will be Toronto's first net zero community -- meaningthe total amount of energy used on an annual basis is roughly equal to the amount of energy produced through renewables.

City Council approved the design for the project andpending a financial review, construction won't begin until 2022 at the earliest.

That's two years after shovels are expected to break ground atMattamy'sBerczy Glen project in north Markham.