Elizabeth Kolbert calls the Danish island of Samsø the island in the wind because of its switch to renewable energy in 1997, after the Danish Ministry of Environment and Energy decided it had potential:
They formed energy coöperatives and organized seminars on wind power. They removed their furnaces and replaced them with heat pumps. By 2001, fossil-fuel use on Samsø had been cut in half. By 2003, instead of importing electricity, the island was exporting it, and by 2005 it was producing from renewable sources more energy than it was using.
Some details:
All told, Samsø has eleven large land-based turbines. (It has about a dozen additional micro-turbines.) This is a lot of turbines for a relatively small number of people, and the ratio is critical to Samsø’s success, as is the fact that the wind off the Kattegat blows pretty much continuously; flags on Samsø, I noticed, do not wave — they stick straight out, as in children’s drawings. Hermansen told us that the land-based turbines are a hundred and fifty feet tall, with rotors that are eighty feet long. Together, they produce some twenty-six million kilowatt-hours a year, which is just about enough to meet all the island’s demands for electricity. (This is true in an arithmetic sense; as a practical matter, Samsø’s production of electricity and its needs fluctuate, so that sometimes it is feeding power into the grid and sometimes it is drawing power from it.) The offshore turbines, meanwhile, are even taller — a hundred and ninety-five feet high, with rotors that extend a hundred and twenty feet. A single offshore turbine generates roughly eight million kilowatt-hours of electricity a year, which, at Danish rates of energy use, is enough to satisfy the needs of some two thousand homes. The offshore turbines — there are ten of them — were erected to compensate for Samsø’s continuing use of fossil fuels in its cars, trucks, and ferries. Their combined output, of around eighty million kilowatt-hours a year, provides the energy equivalent of all the gasoline and diesel oil consumed on the island, and then some; in aggregate, Samsø generates about ten per cent more power than it consumes.
Of course, this all treats the transition as free, which, of course, it isn’t:
Each land-based turbine cost the equivalent of eight hundred and fifty thousand dollars. Each offshore turbine cost around three million dollars. Some of Samsø’s turbines were erected by a single investor, like Tranberg; others were purchased collectively. At least four hundred and fifty island residents own shares in the onshore turbines, and a roughly equal number own shares in those offshore. Shareholders, who also include many non-residents, receive annual dividend checks based on the prevailing price of electricity and how much their turbine has generated.
I need more policy details:
Thanks to a policy put in place by Denmark’s government in the late nineteen-nineties, utilities are required to offer ten-year fixed-rate contracts for wind power that they can sell to customers elsewhere. Under the terms of these contracts, a turbine should — barring mishap — repay a shareholder’s initial investment in about eight years.
If the investment pays for itself in eight years, that’s a surprisingly good return on investment. To what extent are the Danish tax-payers subsidizing it?