US power technology giant GE and Keystone Tower Systems have installed the world’s first ‘tapered spiral welded’ wind turbine tower, an 89-metre-tall unit topped with workhorse 2.8MW machine.

The technology, in development as part of a “multi-year” collaboration tween the pair, will allow for mobile factories to be set up at a project site to curl and weld flat sheets of steel into 25-foot-diameter towers that could support hub height of some 160-metres.