It's been known for about 30 years that when efficiencies hit about 23% for sunlight energy conversion to electricity, it would be economical. With oil at $150/bbl, and tens of thousands of cars (including GE's fleet) running on clean, cheap electricity, I would not be surprised to see solar equities increasing 5-10 fold - it's just a matter of time and might have already happened if not for financial bubbles on an unprecedented scale and distribution. California already has a mandate for 33% renewables, and when their recession ends will look better than ever before.
Just my humble opinion. I am not leveraged - no worries there.
I hear comments about oil running to $150...it all depends on supply and demand. If OPEC senses that solar is a threat, it will take the price down to $30 (and even then they make good money). Remember the ethynol hype couple of year back and BAM oil dropped to 30 and no one talks about it.
There will be balance of all types of energy. Uranium stocks are jumping now in hopes there there will be lot of N-powerplants built. Now they claim it's a clean energy.
If solar becomes as popular as many are hyping, the buying power shifts to consumers where they can DIY solar on the house and no longer need Utility company. Utility companies are well aware of this and will lower the price to 5c/kw (which is already in many midwest states..iowa, MO, IL compared to 31c on the coasts).
Solar will grow but the hyper growth is done and will now grow incrementally starting 2012.