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I spend most of my day meeting and talking to companies in the cleantech sector. And those of you who know me know I have opinions on who is doing it right, and who is doing it wrong. So I thought it was about time to initiate the Cleantech Blog Power 10 Ranking of cleantech companies doing it right. Eligibility for inclusion in the ranking requires meeting a 6 point test.

"it was all summed up clearly for me by members of COPAGEN, a coalition of African farmer associations, scientists, civil society groups and activists who work to protect Africa's genetic heritage, farmer rights, and their sovereignty over their land, seeds and food. All these knowledgeable people have shown me that the answer is quite straightforward: many of those imported mistakes, disguised as solutions for Africa, are very, very profitable. At least for those who design and make them."

Conventional geothermal power taps hot water rising naturally to the surface from shallow beds of volcanic rock. By contrast, hot rock, or engineered geothermal systems, depend on heating water by circulating it through rock as far down as 5 kilometres,

I thought it was about time I put out a wind power generators guide for those who want to know the top resources in this area.

Presently the issue of wind power is affecting communities throughout New York state. The lines have been drawn between the wind companies and those who support industrial wind power against those who object to this enormous threat to their quality of life.

In neighborhoods across the country, there's a battle brewing: the environmentalists vs. the aesthetes. As "green"-minded homeowners move to put in new energy-efficient windows, solar panels and light-reflecting roofs, they are bumping up against neighbors and local boards that object, saying the additions defy historic-district regulations, will look ugly or damage property values.

Germany's Schott Solar and Wacker Chemie AG have formed a joint venture to produce silicon wafers for solar cells, another sign of how the solar industry is consolidating. Under the deal, Wacker will supply purified silicon to Schott Wacker who will make wafers and sell them to Schott who will make the solar cells. The joint venture will also sell wafer to other solar cell makers.

"Pike Research, who just released a report predicting that LEDs will account for almost half of the $4.4 billion commercial lighting business within the next decade."

Obama was against ending the current ban on offshore drilling, but now he's sort of open to it, if it's part of a bigger energy-independence deal. This has upset a number of his supporters who desperately want a president who will adhere firmly to his positions, even when they become totally irrational. While McCain was never violently opposed to offshore drilling, he has now embraced it as if it is not only the solution to our energy problems, but also the key to eternal salvation. Really, it's a little scary. You can't help wondering if he's been captured by some kind of drilling cult.

Two strong potential candidates for the Next Big Thing in cleantech venture capital are nuclear and carbon capture and storage. I've spoken with numerous VCs recently who are looking for innovative ways to play in nuclear power. Bets have already been made by VCs in small-scale nukes, hot fusion, and technologies related to big-scale nukes. The hope is to find a low-cost solution that is practically zero carbon emissions and also provides reliable "base load" power. So in other words, the hope is for a lower-carbon replacement for coal power. The challenges are also significant, however, not least of which being time to market for any new innovations, as this interesting article illustrates. With the recent news that the DOE will be putting $2.4B into carbon capture and storage, and its inclusion in emerging climate legislation, it's also clear that CCS will be leaned upon as a hoped-for way of making our existing coal-fired generation infrastructure less impactful on the atmosphere, while still preserving its value as low-cost baseload power. So in other words, the hope is for a lower-carbon "fix" for coal power.

The "windfall profits" tax is back, with Barack Obama stumping again to apply it to a handful of big oil companies. Which raises a few questions: What is a "windfall" profit anyway? How does it differ from your everyday, run of the mill profit? Is it some absolute number, a matter of return on equity or sales -- or does it merely depend on who earns it? Enquiring entrepreneurs want to know. Unfortunately, Mr. Obama's "emergency" plan, announced on Friday, doesn't offer any clarity. To pay for "stimulus" checks of $1,000 for families and $500 for individuals, the Senator says government would take "a reasonable share" of oil company profits.

Normally these academics would be fine without our fascination. They weren't looking for glory when they decided to study organisms most people either can't see or wish they hadn't. But when the Deepwater Horizon exploded in April 2010, our collective bias toward cute big creatures started to matter a great deal. That's because the instant the spill-cam was switched off and it became clear that there would be no immediate mass die-offs among dolphins and pelicans, at least not on the scale of theExxon Valdez spill deaths, most of us were pretty much on to the next telegenic disaster. (Chilean miners down a hole-and they've got video diaries? Tell us more!)

"SURVEYS of hundreds of UK households reveal that people who have made their houses more energy efficient are more likely to indulge in small excesses - turning up the heating, for example, or keeping it on for longer."