Canada's first concentrated solar thermal plant

Canada's first concentrated solar thermal plant

Postby Oscar » Sun Nov 23, 2014 11:11 am

Canada's first concentrated solar thermal plant

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Medicine Hat, "The Gas City," goes solar

By David Dodge and Duncan Kinney November 16, 2014

More than three years ago Ted Clugston was showing me around the small southern Alberta city of Medicine Hat for our pilot episode. [ ... revolution ] He pointed to a hillside and said he eventually hoped to see a showcase solar project there. He saw it as an educational opportunity and a chance to show the world that Medicine Hat was investing in clean energy.

At that time Clugston was a town councillor. Now he’s the mayor, and that showcase solar project is nearly complete. It’s a one-megawatt concentrating solar thermal plant, the first of its kind in Canada.

It’s a pretty cool sight to see — row after row of large concave metal mirrors glowing in the early morning sun on the hill just above the Trans-Canada Highway and Medicine Hat’s existing natural gas power plant.

Medicine Hat is called the gas city, and for good reason. It sits on sizable natural gas reserves, which meant the city never suffered at budget time. In 2007 the city started down a path that should serve as a model to those lucky places that are endowed with fossil fuels.

“We knew at the time we had to give back in some way. We had to reinvest, we had to diversify because all of our eggs were in that one basket, which was natural gas,” says Clugston.

They started an energy conservation and renewable energy program called “Hat Smart.” [ ... revolution ] And from 2008 to June 2014 they’ve handed out almost $4 million dollars in rebates for things like energy-efficient refrigerators, air conditioners and energy audits. [ ... 202014.pdf ] The money has also helped build over 100 different small-scale solar power projects.

But this one-megawatt concentrated solar thermal plant — this was something else entirely. And while it won’t have its official ribbon cutting until June 21 of 2015, by the time you read this they should be generating power at the plant on a test basis.

What the heck is concentrating solar thermal energy anyway?

“The difference between thermal and photovoltaic is sometimes hard for people to grasp. The best way I get people to understand this project is I say "When you were a kid and you had a magnifying glass, and you focused it and you burnt ants. Well, that's what this is,"" says Clugston.

By focusing the sun's rays onto a consistent point, you can generate incredible amounts of heat. That heat is used to turn water into steam, which spins a turbine and generates electricity. This project generates temperatures of 340 degrees Celsius.

And while this is the farthest north that a concentrated solar thermal project has ever been built, solar makes sense in Medicine Hat. As Clugston reminds us, Medicine Hat is the sunniest city in Canada, receiving more direct sunlight annually than Miami, Florida.

This installation is also one of a handful of concentrating solar thermal plants that is connected to an existing thermal plant. It works in concert with a neighboring 204-megawatt natural gas fired power plant the city utility runs.


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