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If China's addicted to solar hot water heating, the city of Dezhou is it's dealer (and one of it's biggest customers). A new video from Greenpeace, above, highlights the build-up of solar among residents and as an industry. Some facts from this shining example: Of the city's 5.5 million residents, almost all living in the new town use solar heating, and about 90 percent of homes in the old town have solar heating. In 2007, 800,000 people had jobs in the solar panel industry, or about one in three people of working age in the city. That figure is expected to grow to 150,000 by 2020. No wonder: Dezhou is home to the world's biggest solar water heater manufacturer. And compared with an electric heater, a solar heater in Dezhou, which starts at about US$190, pays for itself in five and a half years. The numbers in Western countries, by comparison, make us want to shield our eyes.

Hot on the heels of the release of the NRDC's renewable energy map, we have another piece of first-rate energy geek eye candy: NPR: Power Hungry: Visualizing The U.S. Electric Grid. This map will let you check different sources (with separate maps for wind and solar, in addition to traditional sources), and toggle transmission lines and other features on and off. My only gripe is that you can't zoom the maps, which in some cases makes it a challenge to click on the circle for a particular power plant.

olar domestic hot-water systems don't grab as many headlines, probably because they're not considered as high-tech as their solar PV cousins, where science is pushing the boundaries of sunlight-to-electricity conversion. I'm always surprised that residential solar thermal systems don't get much attention in the United States, particularly in the south where many homes have swimming pools (that need heating) and where the sun shines warm all year, making the payback dramatically better than PV. In Canada, where the conditions are less ideal, we seem for some strange reason to have a greater appreciation for rooftop solar thermal systems, and indeed, have many startups, such as EnerWorks, and academics spending considerable time improving on the technology.

I've got another guest post from Neil Howes up at TOD, this one proposing a rough plan for North AMerica to obtain 50% of its power from wind by 2030 - A North American Wind Energy Scenario. Would a "50% of electricity generated by wind scenario" work in North America by 2030? In this post, I make a rough cut estimate of what might be required to make such a transition in about 20 years time. Most proposals that are being made rely on a very big increase in carbon free energy, both to charge electric vehicles (EV's) and to replace oil and natural gas (NG) presently used for hot water and space heating. In this post, I lay out a path by which 50% of North American energy might come from wind by 2030, including replacement of a large share of oil and natural gas use by electricity. ... High quality wind resources (wind speeds greater than 6.9m/sec) in the US are estimated to be >5,500GWa, about x10 all of N America's present electricity production of 550GWa. Canada's potential appears to be similar or greater than the US, while Mexico's wind resources are more limited (these figures do not include deep offshore resources that could be harnessed by floating wind turbines or higher altitude wind resources that could potentially be harnessed by airborne wind turbines).

Power lines, such as those near Hoover Dam, cannot be built to reach remote areas for renewable energy development until the areas for energy production are agreed upon. Several entities have offered or are working on maps locating renewable energy resources. By Alexandra Berzon (contact) Tue, Jun 16, 2009 (2 a.m.) Click to enlarge photo Chris Morris Related Document (.pdf) * See the Western Renewable Energy Zones report Sun Archives * State thinks big on solar power (6-15-2009) * The power of the desert (4-5-2009) * State faces obstacles to cashing in on sun (3-9-2009) Sun Coverage * Archive of Sun energy stories Related Story * States, energy secretary agree to safe nuclear waste transport On one map they look like bubbles. On another they're more like hot dogs. These shaded circles and oblongs in Nevada and across the West could one day be clusters of solar power plants, wind farms or geothermal energy projects.

Find hot green jobs in renewable energy, environmental engineering and more from GreenerCareersGuide.

During the summer, the attic becomes very hot, as it comes in direct contact with sunlight. As a result, the entire house becomes warm and uncomfortable.

Heating water by taking solar energy directly from the sun is a very good investment and is used in many homes. Solar water heating is cost effective compared to electric or liquid propane gas water heating if the rate is more than $0.07 a kilowatt hour or $1.15 a gallon for LP gas.

The attic becomes very hot in the summer months and small ventilators are not sufficient to move out that heat. Instead, the heat travels down to the living spaces making your home a very uncomfortable place to stay.

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Good critique of Earth Institute

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China Coal Mining Industry report provides key data and concise analyses on the coal mining industry in China, a list of major 20 enterprises in the sector as well as the comparison on investment environment in top 10 hot regions.