Too much power? Solution for too much wind energy

There is no question that we often need to give away and export of electricity when demand is low and production is up.  Why not find ways to utilize all of our excess electricity when demand is low?  Doing this through heat storage curtails our fossil fuel consumption, and provides us with lower cost heating options.  Great concept.  Would love to see more test programs developed with the Ontario smart metering roll-out.

January 20, 2011

Possible solution to storing wind power

Column | Korky Koroluk

A simple, low-tech solution to the problem of storing wind power is undergoing testing in three small North American markets — one in Summerside, P.E.I., and two in Maine.

In the process, it is showing how alternative energy is able to offer new jobs for HVAC engineers and contractors.

The solution involves not centralized storage in one large plant, but “distributed” storage involving small ceramic heaters in peoples’ basements. It’s also being installed in a few small commercial buildings.

Critics have often criticized wind or solar energy installations because the wind doesn’t always blow and the sun doesn’t always shine. Intermittent sunshine has been overcome by building concentrating solar plants which, on sunny days, store energy as molten salts that are later used to produce steam turbines. It’s a system that is now being used in several places in the world, most notably Spain and the American Southwest.

Now researchers have come up with ceramic heaters, which are nothing more than extremely dense ceramic blocks in insulated cabinets. The blocks store energy as heat when the wind is blowing, then release it slowly over the next day or two.

The American experiments have been under construction for several months; the Summerside project is just beginning.

Prince Edward Island produces a lot of wind power. The problem is that the wind tends to blow more at night when energy demand is low. Because of this, the province has been selling some of that surplus energy to mainland markets, but at low rates.

But at a recent meeting of Summerside city council, homeowners were asked to buy the ceramic storage systems.

The heaters are expensive, though, at about $2,000 each. They are expected to save money over the long term, but that is often not sufficient to get people to act. That’s why the city is offering users a break on their electricity prices that could amount to about $600 a year. City fathers hope that will lead to at least 100 sales this year.

In Maine, getting people to convert to distributed wind energy is more urgent because oil is used to heat 80 per cent of all homes in the state. That’s why the incentive for switching off oil is somewhat sweeter.

For a start, the Highland Wind project developer, Independence Wind, is offering any participating household a $6,000 “wind for oil” grant. The money is to fund the purchase of one of the ceramic-block units, although it can be used for any renewable energy or efficiency investment.

In return for providing the storage, Highland Wind will supply wind power to residents at a deeply discounted price.

Fuel oil is presently running at about $3 (U.S.) a gallon. The discounted price will be equivalent to about $1.15 per gallon of oil.

The other Maine project involves Vinalhaven Island — an entire island with small communities dotted around it that has committed entirely to wind power. But like P.E.I., it has had to sell some off-hours power or shut down some of its turbines.

The project looks like a winner for the local economy, as well as individual users.

The total project is estimated to cost more than $210 million, most of which will go directly into the state economy through engineering, environmental, construction and related jobs. At peak construction, the project will bring more than 300 jobs to the local region. And every year, the project will pay more than $500,000 in state, local and county taxes.

That’s a lot of benefits for the application of what is really an old idea. There is, after all, nothing new about using ceramic blocks to store heat, and similar heaters are already in use in Britain to even out peak demand on its electricity grid.

But an old idea becomes new again if it means reduced reliance on oil.