Ormat

Ormat is a leading provider of alternative and renewable energy solutions; to date, Ormat has installed over 750 power units worldwide. Oramt also owns and operates 515 MW of geothermal and recovered energy based power plants. Ormat is a dual company being trades in the US stock exchange and in Tel Aviv (part of the TA25 index).
Their corporate website is an excellent example of Drupal at it's best for enterprise identity, with rich, yet simple content management, and an expression of every important aspect of it's internal units.