September 7, 2005
San Diego, CA, USA: SDG&E Signs Solar Thermal Electric and Other Renewable Energy Pacts
San Diego Gas & Electric has contracted to buy 300 megawatts of solar thermal electric power, with the potential to grow to 900 MW within 10 years. The project would be one of the largest solar thermal electric facilities in the world when fully constructed. The utility also announced the purchase of approximately 4 MW of energy and capacity from a local biogas landfill project.
"At SDG&E, we have pledged to tap resources like solar and biogas power to meet 20 percent of our customers' energy needs by 2010," said Edwin A. Guiles, chairman and CEO of SDG&E. "With these purchases, we continue to demonstrate our commitment to creating a balanced mix of renewable and fossil energy resources for the region."
SDG&E will purchase the solar energy from Arizona-based Stirling Energy Systems. SDG&E and Stirling have agreed to a 20-year contract to first purchase 300 MW from Stirling's SES Solar 2 facility, home to a series of Stirling solar dishes on approximately 3 square miles in Imperial Valley.
SDG&E has options on two future phases that could add an additional 600 MW of renewable energy and capacity to SDG&E's resource mix. While solar energy is not always available because of environmental factors, it is generally abundant during the hottest parts of the day, making it available to meet peak demand from customers.
http://www.solarbuzz.com/news/NewsNAPR543.htmI've looked at the pics of the stirling engine generators and they look impressive. Don't know if Arizona or New Mexico is doing anything like this?
Also, another electric grid reserve measure are huge batteries that act as capacitors to meet peak demand. They're called flow cells; one is being installed at, of all places, an Air Force base in Missisippi that gets a lot of weather-related outages.
Recharging the Power GridFighter jets scream over Columbus Air Force Base, a sprawling military facility in eastern Mississippi that is especially busy these days training aviators for the war on terror. But for all the high tech aeronautics on display overhead, the bustling Air Force base often relies on an old-fashioned diesel generator to keep radar and communications humming and the jets from colliding. That's because the region's antiquated, overloaded power grid dishes out 25 blackouts a year, as well as another hundred or so voltage fluctuations that crash sophisticated flight simulators.
The solution-the world's largest battery-is under construction nearby. Two cavernous steel tanks, each one 10 meters tall and 20 meters in diameter, will soon hold nearly four million liters of concentrated salt solutions, electrolytes that will be charged and discharged by 24,000 fuel cells in an adjacent building. At night this installation, known as a flow cell battery, will suck electricity from the grid and store the energy, which it will discharge during the day when power lines are strained. When blackouts strike-common in this tornado-prone region-the huge battery will keep the base humming for up to 24 hours.
This massive battery represents more than a backup power supply for an isolated military facility. It's a bold experiment in large-scale electricity storage on the power grid-the aging maze of interconnected power plants and transmission lines that cover the country. Today's grid operates with minimal storage, so at all times, electricity flows must exactly balance the power that's being consumed. Partial solutions are available in a new class of digital switches that more efficiently deliver electricity during crunch periods (see "A Smarter Power Grid ," TR, July/August 2001). But devices such as the Columbus flow cell, which is being built by the federally operated Tennessee Valley Authority and Swindon, England-based Regenesys Technologies, go one step further. By storing hours of electricity, flow cells offer, for the first time, the possibility of freeing the grid from the need to continuously balance production and consumption.
The implications of a newly flexible grid are immense. Sufficient storage capacity would relieve pressure to build new power plants and transmission lines, prevent regional blackouts, even speed the adoption of wind farms and solar panels by transforming intermittently produced power into steady reserves. Also, by dampening glitches and power spikes, the more flexible grid would provide the high-quality power needed for today's sensitive electronic equipment. Problems ranging from blackouts to the voltage fluctuations that cause chaos in high tech manufacturing sap an estimated $119 billion from the U.S. economy every year, says Kurt Yeager, CEO of the Electric Power Research Institute, a utility-funded R&D consortium in Palo Alto, CA. This hemorrhage is just one indicator that power grid fundamentals need rethinking, he adds. "The world as we know it can't continue. Prudent people would not wait for the lights to go out to do something about it. We've got to change the architecture of the grid," he says.
http://cache.technologyreview.com/articles/03/03/fairley0303.asp?p=1These plus digital switching are stop gap measures that may have to be implemented if deregulation spreads.
Edit: Good for you New Yorkers! At least the state is doing
something to encourage renewables. Best of luck in your endeavors!