solar voltaic power

The New York Times blows the solar PV story

It would seem like an easy story for the paper of discord record: In recent months, chains including Wal-Mart Stores, Kohl’s, Safeway and Whole Foods Market have installed solar panels on roofs of their stores to generate electricity on a large scale … In the coming months, 85 Kohl’s stores will get solar panels; 43 […]

First recorded solar billionaire in China, U.S. billionaires persue wind

This post is by ClimateProgress guest blogger Bill Becker, executive director of the Presidential Climate Action Project. —– Hunter Lovins is one of the country’s premier prophets of the prosperity we can achieve if we move quickly to establish a post-carbon economy. Vast new markets and investment opportunities are opening worldwide for clean technologies. “Those […]

Backscratching

If you are interested in distributed solar generation, you really should get the Interstate Renewable Energy Council's newsletter. I say this because they do critical work on net-metering and interconnection standards. They were also kind enough to publish a profile of our work, so props in return seems only right.

Renewables and efficiency would provide more GDP than fossil fuels

The attached Excel spreadsheet takes specific technologies, the known cost of implementing them, and various scenarios for responses to such implementation and technical improvements (including no technical improvement!) and calculates costs and benefits. This is intended to be an open source model. The comment section will be used to revise the spreadsheet with links to the old versions added to the bottom of this post as revisions are made (for the sake of transparency.) There is also a Word document with a narration of assumptions.

The conclusion in this 1.0 version: Unsurprisingly, the key to eliminating emissions profitably is large efficiency increases. With maximum efficiency improvements even a scenario with (completely unrealistic) zero technical progress in efficiency or renewables would make our economy as a whole richer than if we stuck to fossil fuels. If we combine aggressive efficiency improvements with aggressive (but reasonable) improvements in technology we would end up richer by more than a trillion dollars a year. Aggressive efficiency spending which yields small reductions, unsurprisingly has poor financial payback.

Warning: There is an easy misinterpretation the data does not support -- that we can do nothing. The fact that eliminating most fossil fuel use is more profitable than continuing to use fossil fuels to society as a whole does not mean that elimination will happen without policy changes. Nor does it mean that is currently profitable to those who could make the technical changes. For example, transforming commercial office space into a green building raises worker productivity by a minimum of 4 percent. If a landlord makes that transformation, and somehow gets hold of the confidential data needed to document that productivity gain, how much can she increase rents based on those productivity improvements? If you guessed zero, you are right and win the no-prize. Incidentally, even if the building is 100 percent owner occupied, what do you think the odds are they will invest in improved lighting and ventilation for the sake of productivity improvements?

More than half of today’s electricity, more than 16 percent of today’s energy

Enough sunlight strikes unshaded U.S. rooftops to replace all the coal and some of the natural gas we use to make electricity. Backup via ground source heat pumps, and smart grid technology would allow this variable energy source to displace base-load coal with today's technology. Whether this is the most cost effective way to displace coal is another question. Also rooftop solar is a silver BB rather than a silver bullet: Even after massive efficiency improvements we will need to get many times the power from non-rooftop sources than from rooftops.

According to a 2003 study by the Energy Foundation (PDF), solar PV that converts 15 percent of sunlight to electricity could produce 710,000 Megawatts on rooftops that will be available in 2050. Doug Wood thinks that with concentrating PV using advanced aerospace quality cells we could convert solar at 30 percent rather than 15 percent efficiency. Scaling back to rooftops available today (using 2003 numbers from the same study and extrapolating forward) we could produce around 1.05 billion megawatts today. We normally assume 22 percent capacity factor (PDF) for PV. So that would give us about 2.3 billion megawatt hours, or around 56 percent of today's electrical production -- more than coal provides.

Further, waste heat from this process could provide much of our heating and cooling needs as well. The EF study I cited suggests that about 65 percent of commercial roof space is unshaded compared to about 22 percent of residential roof space. Since some commercial scale chillers run on low to medium temp heat today, with enough storage solar CHP could provide close to 100 percent of commercial heating and cooling. But that much storage takes a lot of capital for a small incremental gain. So more realistically, we would put 16 to 24 hours of low temp Phase Change Material storage and use ground source heat pumps to provide the other 15 percent of low temp needs. As a side effect, the overnight storage would let us run those heat pumps when the electricity was cheapest -- which will prove more important than it might appear at first glance.

Bush places moratorium on new solar projects on public land

In a parting shot at the competition for its fossil fuels supporters, the uber-lame (duck) Bush administration "has placed a moratorium on new solar projects on public land until it studies their environmental impact, which is expected to take about two years."

• Drilling for oil and gas, even in pristine areas -- hey, we’re former oil company executives.
• Leveling mountains in beautiful West Virginia -- we’re all for it.
• Toxic metals from mining -- bring ‘em on!
• Logging old-growth forests -- what so you think forests are for?

But solar power on publicly owned desert land? We need to study that for two years. Wouldn’t want to risk a rush to clean energy. As Senate majority leader Harry Reid (D-Nev.) said, this is "the wrong signal to send to solar power developers, and to Nevadans and Westerners who need and want clean, affordable sun-powered electricity soon."

The only upside of this lame last-minute attack on renewables is that it can be overturned on January 21, 2009.

This post was created for ClimateProgress.org, a project of the Center for American Progress Action Fund.

All new homes to sport solar hot water

Hawai'i is highly dependent on imported oil for its electricity needs -- I've heard Jeff Mikaluna, Director of the Hawai'i chapter of the Sierra Club, quip that the state is one supertanker accident away from becoming Amish.

Which makes this press release great news:

Business consulting firm projects robust growth for solar and grid parity in many locations by 2020

McKinsey has a great new analysis piece: “The economics of solar power.” Overall it’s extremely optimistic, saying that despite uncertainties around technology and policy, growth in the solar sector is all but certain to be robust. Here’s a interesting chart. The size of the yellow ball is the size of the solar market in TWh. […]

Lessons from Europe and Japan

The following article appeared in Foreign Policy in Focus, and was reposted at commondreams.org.

When New York City wanted to make the biggest purchase of subway cars in U.S. history in the late 1990s -- more than $3 billion worth -- the only companies that were able to bid on the contract were foreign. The same problem applies to high-speed rail today: Only European or Japanese companies can build any of the proposed rail networks in the United States. The U.S. has also ceded the high ground to Europe and Japan in a broad range of other sustainable technologies. For instance, 11 companies produce 96 percent of medium to large wind turbines (PDF); only one, GE, is based in the United States, with a 16 percent share of the global market. The differences in market penetration come down to two factors: European and Japanese companies have become more competent producers for these markets, and their governments have helped them to develop both this competence and the markets themselves.