I don't think anyone saw this coming. Because of tax and regulatory incentives, it has always been difficult to find a totally straightforward relationship between the price of oil and alternative energy stocks. Yet no one ever really disputed that, say, if oil prices had remained low - at $10 a barrel as they were in 1999 - there's no way we could have had the boom in alternative energy investment of recent years.

However, over the last few weeks, they have clearly been heading in the opposite direction. Oil is reaching new highs - $111 and the Wilder Hill Clean Energy Index which closed at 206.77 yesterday, is a long way off it's 2007 Boxing Day high of 297.05.

Obviously, there are a lot of investors out there who haven't read the script !

What's happening is that commodities like oil and gold, in the face of the credit crunch, have become the new defensive investments. That strikes me as pretty risky, but it seems to be working for those investors, for now.

And still there is no let up in sight to the alternative energy boom. Figures out earlier this week from Clean Edge make this clear - in 2007, a 40% increase in revenue growth for solar photovoltaics, wind, biofuels, and fuel cells to $77.3 billion. And the projections for 2017 are;

• Biofuels sales will grow to $81.1 billion by 2017 - a 319% increase
  


• Wind power (new installation capital costs) will grow to $83.4 billion in 2017 - a 277% increase
  


• Solar photovoltaics (including modules, system components, and installation) will grow to $74 billion by 2017 - a 365% increase
  


• The fuel cell and distributed hydrogen market will grow to $16 billion over the next decade - a 1066% increase
  

All projections far into the future have a habit of being wrong of course, but Clean Edge has the only annual and projected figures in town. And let's be honest, most of us would be very happy with half these growth rates. It's also worth noting that in the last few years, alt. e. growth rates have actually been faster than anticipated. If there's anything I'm overtly sceptical about in these projections, it would have to be the fuel cell industry which has been the future for a long time. I still don't see a big breakthrough in sight.

It would be interesting to start seeing some figures though on the growth in energy storage technologies, particularly those in the category of hybrid electric vehicles.