Grantham's (whom I respect) views on energy:
"'Over the years,' he explains, 'we have asked over 2000 investment professionals [if they knew of] an exception to our claim that every asset class move of 2 sigma away from trend had broken [back down to trend].'
Unfortunately, Grantham confesses, 'not one of the 2000 ever offered an exception! ... But we have always said that intellectually, you could imagine a paradigm shift in an asset class price, even if we have been unable to document one yet in history.'
He believes crude oil is capable of resisting the powerful forces of mean-reversion. 'It's the best possibility I've seen in my career,' he says. 'But the investment desert is littered with the bones of those who bet on new paradigms."
http://www.investmentu.com/IUEL/2005/20050512.html