Harnessing the vast energy potential of offshore winds: Lillgrund, Sweden’s biggest offshore wind farm (photo, page 28). The heavy foundations posed a special challenge which was successfully mastered by HOCHTIEF Construction. The demanding project includes 48 large wind turbines and a transformer station.

Today, the wind farm generates 350 gigawatt-hours a year—enough electricity to serve a community of 60,000 households (photo, top). Round-the-clock use of this renewable energy source saves 300,000 metric tons of carbon emissions a year compared with conventional energy.