This summer, the first commercial electrical generator to draw power from the ocean tide began supplying Northern Ireland with energy. Installed in an inlet near Belfast, the generator works much like a wind turbine, with massive blades turned by the tide’s current. The angle at which the blades meet the current can be changed: rotating the blade face 180º lets the turbine catch the tide in both directions, while smaller rotations lessen the force exerted on the turbine, preventing damage.
Credit: Marine Current Turbines
Cost: 30 to 40 cents per kilowatt-hour; a planned installation with seven turbines will lower that cost to about 20 cents per kilowatt-hour
Company: Marine Current Turbines
Other products in this section:
The race is on to define the new blockchain era. Get a leg up at Business of Blockchain 2019.Register now
Let’s keep the Green New Deal grounded in science
Advocates hope the proposal will inspire voters, but that’s no reason it has to ignore the latest research.
We could still prevent 1.5 ˚C of warming—but we almost certainly won’t
New research finds we’d need to immediately stop building fossil-fuel-burning vehicles, planes, and factories.
We are starting to wreck the environment around our planet now, too
Our species’ environmental impact extends far beyond Earth. Now one scientist says it’s high time we thought more carefully about what we’re doing to near-Earth space.