California's Renewable Mandate

From: http://www.forbes.com/forbes/2010/0118/outfront-california-renewable-clean-energy-or-bust.html

California's Renewable Mandate
Lee Gomes, 01.18.10, 12:00 AM ET
Solar energy beamed to earth from outer space: It's Popular Mechanics-style engineering with a whiff of science fiction--the stuff, maybe, of a Discovery Channel documentary. But a way for a quarter-million California homes to be getting their electrical power, and not in 60 years, but in 6?

That's the plan. The state's Public Utilities Commission in December approved a proposal by Pacific Gas & Electric to buy power from a southern California startup named Solaren.

Solaren is the creation of ten or so veterans of the region's aeronautics and defense industries; as of a few weeks ago it had neither a Web site nor an office. What it has is some grandiose ideas.

So why is PG&E mixed up in this? Utilities are facing a requirement from the legislature to get 20% of their power from renewable sources by 2010, though an extension will likely be granted. PG&E currently gets 14% from renewables, including geothermal and biomass. You'd think getting to 20% would be an easy task in a big state with deserts, coastlines and windy mountain passes. PG&E is having a rough time at it, though.

In some cases renewable energy technologies remain expensive or unproven. At other times solar and wind farms have been blocked by environmentalists or neighbors who didn't care to look at these things. So the company says it is taking something of a portfolio theory approach to alternative energy sources, embracing a collection of them with the expectation some might not work out. Solaren would seem to be the riskiest of the lot.

Solar panels would be lifted by rockets into an orbit 22,000 miles high, where they would unfurl themselves into an array roughly a third the size of New York's Central Park. Rays from the sun, which are plentiful at that elevation, would be converted to electricity and then beamed down via microwaves to someplace along the PG&E grid. Birds and airplanes would have to keep a distance from the beams.

All of the individual pieces of such a power system have been built before, many times. But never at such a scale. The folks at Solaren say they have concrete ideas on how to make the whole thing work--how to assemble a solar array without astronauts, for example--but aren't providing many details to outsiders.

PG&E says its only commitment to Solaren has been to agree to buy whatever power the company can generate (estimated at 2% of PG&E's needs today). Solaren estimates that to get its panels off the ground it will need several billion dollars, which it is in the process of raising from private investors.

Naturally the plan has attracted skeptics. Not because of the basic idea; space solar power is being pursued in various forms all over the world, including by Japan's space agency. The doubts involve whether the meager resources available to Solaren are up to the moon-shot ambitions of the undertaking.

Martin Hoffert, a New York University physicist who is a big believer in space power, says this is properly the work of a government outfit like NASA. The science might be mostly on the mark, but what's happening in California, he says, "is the wrong business plan."

It may not be wrong for PG&E, though. If Solaren's panels never fly, the utility can say it tried very, very hard to get renewable energy and needs another extension.

Solar Plant in Space Gets Go-Ahead

From: http://greeninc.blogs.nytimes.com/2009/12/03/solar-plant-in-space-gets-go-ahead/

Solar Plant in Space Gets Go-Ahead

by Todd Wood

California regulators on Thursday went where no regulators have gone before — approving a utility contract for the nation’sfirst space-based solar power plant.

The 200-megawatt orbiting solar farm would convert solar energy collected in space into radio frequency waves, which would be beamed to a ground station near Fresno, Calif. The radio waves would then be transformed back into electricity and fed into the power grid.

“At the conceptual level, the advantages of space-based systems are significant,” said Michael Peevey, president of the California Public Utilities Commission, during a hearing on Thursday. “This technology would offer around-the-clock access to clean renewable energy, and while there’s no doubt this project has many hurdles to overcome, both regulatory and technological, it’s hard to argue with the audacity of the project.”

“It’s hard to argue with the audacity of the project.”

— Michael Peevey, California Public Utilities Commission

A Southern California start-up called Solaren will loft components for the solar power plant into orbit and sell the electricity it generates to Pacific Gas and Electric, the major utility in Northern California, under a 15-year contract. The project is supposed to be turned on in 2016.

Solaren, founded by veterans of Hughes Aircraft, Boeing and Lockheed, plans to deploy a free-floating inflatable Mylar mirror one kilometer (0.62 miles) in diameter. This will collect and concentrate sunlight on a smaller mirror, that in turn will focus the rays on photovoltaic modules, according to the company’s patent.

In an interview with Grist in April, Gary Spirnak, Solaren’s chief executive, said that the vital part of making a space-based solar farm economically viable was to take the weight out of the system to reduce the number of rocket launches.

Still, Mr. Spirnak, who previously ran space shuttle flights for the United States Air Force, acknowledged that putting a solar power plant in space would cost a few billion dollars more than a terrestrial photovoltaic farm generating the equivalent amount of electricity.

The rate that P.G.& E. agreed to pay Solaren for the electricity produced by the solar station remains confidential. Also, regulators said on Thursday that the utility could not count the project toward its renewable energy mandates unless certain milestones were met.

More on PG&E and Space Solar

from: http://anz.theoildrum.com/node/5314
The benefits of space based solar power
If Solaren (or other companies pursuing similar ambitions, such as Heliosat, Space Energy, Space Island Group, Powersat and the Welsom Space Consortium) can collect solar energy in space and transmit it to earth they will have opened up a significant new energy resource. The sun's energy is almost continuously available to a satellite located in a geosynchronous orbit about the earth (leading promoters of space based solar power schemes to dub it "baseload solar power").
A 2007 study by the Pentagon’s National Security Space Office which included representatives from DOE/NREL, DARPA, Boeing and Lockheed-Martin found that a one-kilometer-wide band of space in earth orbit receives enough solar energy in just one year (approximately 212 terawatt-years) nearly equal to “the amount of energy contained within all known recoverable conventional oil reserves on Earth today” (approximately 250 TW-yrs). The Pentagon study suggested such a system could be tested as early as 2012, with the likely first customer being the US military.
There are a number of key advantages that make space based solar power an interesting alternative to ground-based solar power:
•There is more energy to be collected - the sun is more intense in orbit than on the surface of the Earth
•Space based systems can collect energy almost around the clock
•Ground-based systems suffer from weather phenomena such as clouds, precipitation, and dust - space based system do not (though the increasing amount of junk in orbit poses a similar hazard)
•Real estate costs are minimal - the only land that need be acquired is the land for the receiving station.
•Transmission line costs are greatly reduced compared to remote generation facilities if the ground station is located near existing transmission lines
The video below is from the National Space Society, showing what a space based solar plant might look like.
Challenges
There are 2 primary challenges to making space based solar a reality.
The first is the technological challenge of making a scheme like this work - this is not been so much converting solar energy into radio frequencies (which has been done before, though not on Solaren’s scale) - but in getting a supersized solar array into space and successfully commissioning it.
The second challenge is one of economics - can the cost involved in building a solar power plant in space ever be competitive with ground based concentrating solar thermal, regular solar PV or thin film solar power plants.
Plans for space based solar have traditionally included kilometre long structures of solar arrays connected to satellites, and launching thousands of tons of heavy metal into orbit is exorbitantly expensive.
Solaren's Spirnak says he has a solution - “We want to take the weight out of these systems. We came up with this design concept to break these things into pieces instead of trying to construct many, many kilometers of structures in orbit, which would essentially be unbuildable.”
Instead, his station will consist of two to four components that will float free in space (kept in alignment by software controls and small booster rockets rather than heavy wires, cables and struts). According to Solaren’s patent, an inflatable Mylar mirror a kilometer in diameter will collect and concentrate sunlight on a smaller mirror that will focus the rays on the solar array. By adopting a concentrating solar power approach, a smaller and lighter array can be deployed, reducing the cost of lifting the components of the structure into orbit.
At this point there is little information about cost available for Solaren's proposal, though Grist quotes Spirnak as saying the price tag for the 200-megawatt solar power station for PG&E will be “in the several billion dollar range” and will require 4 or 5 rocket launches.
History
The concept of space based solar power was first proposed in 1941 by science fiction author Isaac Asimov in his book “Reason,” about a space station that collects solar energy and beams it to Earth.
Wikipedia's article on the topic includes a good timeline of developments in the field, noting that Dr Peter Glaser was granted a US patent in 1973 for his "method of transmitting power over long distances (eg, from an SPS to the Earth's surface) using microwaves from a very large (up to one square kilometer) antenna on the satellite to a much larger one on the ground, now known as a rectenna".
Asimov continued to promote the idea throughout his life, with this talk (part 1, part 2) on "Threats To Humanity", delivered to The Humanist Institute In New York in 1989, in which he described the threats of global warming and fossil fuel depletion, and recommended the solution as space based solar power whose delivery is managed by a federal world government / "stable world order".
Another peak oil observer who has regularly promoted the idea of space based solar power is JD at Peak Oil Debunked, who has looked at the idea of solar power plants based on the moon a number of times (Lunar Solar Power, More on Lunar Solar Power).
Skepticism
Another space based energy panacea, using helium 3 from the moon to fuel fusion reactors, has caused some cynics to mutter that this is just a scheme to funnel large amounts of funds to well connected aerospace companies. I suspect that similar charges will be laid against spaced based solar power plans until the economics of them can be proven to match those of terrestrial renewable energy projects.
The authors of the Pentagon report mentioned earlier noted that space based solar “has the potential to be a disruptive game changer on the battlefield ... [enabling] entirely new force structures and capabilities such as ultra long endurance airborne or terrestrial surveillance or combat systems” - which implies that there might be more than one reason for wanting to deploy space based solar power - like the symbiosis between nuclear weapons development and the nuclear power industry, it may be that space based solar power provides a civilian friendly reason for building 'star wars" type platforms in space.
Cryptogon has some speculation along these lines, and goes on to wonder if this is another possible example of the introduction of technology developed in "black" military projects (there is a section in my "Shockwave Rider" review that talks about the 5000 secret patents registered by the USPTO) into the civilian sector (echoing his speculation about the role of the new GM CEO appointed by the Obama administration).
Another skeptic commenting on the Solaren proposal at Peak Energy wondered cynically if this was a form of greenwashing by PG&E, saying "This is an opportunity for PG&E to get some free green publicity and "demonstrate" their interest in meeting their RPS requirements. When the power doesn't appear in 2016, they can just throw up their hands and say "we tried, not our fault"."
Most skeptics focus purely on the economics though, with the Motley Fool declaring Space-Based Solar? That's Just Silly and Energy & Capital asking "Why would anyone be interested in space-based solar power when commercial utility scale solar technology on the ground today costs 0.3% of its price?" in The Solar Race Will Be Lost in Space.
Also:
http://southmauisustainability.wordpress.com/2009/04/10/space-based-solar-power-agreement/
http://www.gizmag.com/pge-sign-up-for-200-mw-of-baseload-space-solar-power/11495/