TRCPA, a day or two ago you said oil companies and GE were involved in alternative energy just for public opinion/relations reasons. I agreed somewhat stating BP was running ads on TV. That said, as 4tj stated, if there is money in it and it's the future, the big boys will be involved. Note most are doing their own R&D and not making acquistions of alternative energy companies (that I have noticed).
Cash is King until further notice!!!
My comments on companies are usually my opinion of long term success (years). The PPS may go up or down greatly in the meantime depending on the number of greedy suckers with money.