There are very few people working in Alternative Energy who restrain themselves from making grandiose statements, but Bill Gross of eSolar is one of the few who sticks to the facts, and clearly has worked hard to get through (notaround) the challenges. Here is a tech entrepreneur who reallyunderstands the big themes: energy density, the cheapness of coal, theproblem of scale, and the tight margins in both capital and energy terms that can be so decisive as solar competes to become economicallycompetitive. This is actually quite an amazing interview that Gross gave this week to Henry Blodget of The Business Insider. For you energy bugs, pay close attention toGross’ discussion surrounding the diffuse nature of sunlight,and his keenly spot-on obsession with controlling all the manufacturingvariables to perfection. If there’s a place where the best of energy and entrepreneurship can ever meet, it’s here. Must watch video.