LittleYellowFrog

Boeing have just flown a fuel cell powered light aircraft with a person on board – they picked a motor-glider for this trial flight which seems a sensible choice.

In other news, Ireland is installing the world’s largest underwater turbine built by Seagen.

Both of these articles came to my attention via InventorSpot

Apparently, underwater turbines might be one alternative to building dams.

Although dams can provide a lot of power, their size and impact upon local people and the surrounding environment ensures that they remain a controversial choice. Underwater turbines which harness tides or river currents might have less (visible) impact – although I don’t know what impact they might have on fish.

Wikipedia has more on the Kaplan turbines mentioned in the article.