Microsoft is leading the charge against the traditional utility model, which, like many large high-tech companies, has adopted a corporate sustainability policy that mandates aggressive reductions in the company’s greenhouse gas emissions and, ultimately, use of 100% renewable energy. Microsoft’s sustainability policy has run head-long into the heavy dependence of its major electricity supplier, Puget Sound Energy, and the collision has produced cracks in Washington’s utility regulatory model that may presage a fundamental rethinking of Washington’s utility business model.