Guardian: Not every company can boast Arnold Schwarzenegger, Colin Powell and the heads of Google and Walmart at its launch. Even more unlikely, the firm in question makes what some may regard as a less than sexy clean energy device. But such was the razzmatazz that accompanied the unveiling of Bloom Energy’s eagerly awaited “energy server” today at the California headquarters of one if its first customers, eBay. A mini power station containing fuel cells that can run on anything from …