The last extended tension-leg platform (E-TLP), based on the old ABB Lummus Global design, was installed more than five years ago.

After several years dominated by spar and semi-submersible-based developments moving forward, there now are three projects that are set to bring the massive, four-column TLP back to the forefront of deep-water development solutions — and a fourth is expected to join that group in 2010.

Two