Walmart already controls more than 25 percent of the U.S. grocery market. With its latest organic scheme, it’s aiming to control even more. Continue reading
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Yesterday New York Times reporter Matt Wald had a piece on the role of energy storage in supporting the expansion of renewable energy. However, his specific focus on solar thermal power generation overlooks the potentially high costs of relying on solar thermal power as well as the potential for distributed “storehousing” of renewable energy. Solar… Continue reading
The following map was the headline graphic to our 2009 report, Energy Self-Reliant States, the report that inspired this blog. I re-created the map for web viewing, so it’s now even easier to share how each state can meet its electricity consumption with in-state renewable energy resources.
The renewable resources considered include on- and off-shore wind, rooftop solar PV, hydro, combined heat and power, and high-temperature geothermal. Read the Energy Self-Reliant States report for more details.
There’s no better illustration of the value of distributed renewable energy than the U.S. military. In Iraq, the 50,000 U.S. troops (as of August 2010) use 600 million gallons of fuel per year at a cost of dozens of lives of U.S. soldiers who die protecting fuel convoys and financial cost of nearly $27 billion for fuel and security ($45 per gallon!). New distributed renewable energy systems can help combat brigades reduce fuel consumption, saving lives and money.
One Marine company – Company I, Third Battalion, Fifth Marines – field-tested the Ground Renewable Expeditionary ENergy System (GREENS) system in August 2010 and found that it saved 8 gallons of fuel per day for each of the company’s 150 men. Complemented with other renewable energy systems, the Marines powered their combat operations center without using the diesel generator for eight days.
The renewable technology that will power Company I costs about $50,000 to $70,000; a single diesel generator costs several thousand dollars. But when it costs hundreds of dollars to get each gallon of traditional fuel to base camps in Afghanistan, the investment is quickly defrayed.”
It takes approximately 200 GREENS (1,600 kilowatts of solar modules with battery storage for 300 Watts of continuous power) to replace a single 60 kilowatt diesel generator, but it saved the Marine company 1,200 gallons of fuel per day. In Iraq, that fuel would have cost $45 per gallon, including transportation and security costs. That’s a savings of $54,000 in a single day. If priced at $70,000 each, the 200 GREENS will pay back in 260 days, less than 9 months.
If every U.S. company serving in Iraq made use of GREENS, it would reduce fuel consumption by U.S. troops by 25%, saving 146 million gallons of fuel and $6.5 billion per year.
There are benefits besides saved fuel and money. Marines appreciated that the solar-powered base systems are quiet, and also don’t require constant refueling. The no-fuel requirement also benefits security, as 72 U.S. soldiers died protecting convoys in Iraq in 2009.
The military provides a great illustration of the utility and cost-effectiveness of distributed generation, and one that should inform state-side strategies for energy deployment.
Update: It’s important to note that this refers to the net installed cost. In other words, the installed cost dropped because residential solar customers were now getting an uncapped federal tax credit. We wrote in this 2009 report about the perverse problems created by the $2,000 cap on the federal residential solar tax credit. The… Continue reading
With environmental (e.g. desert tortoise) and political (NIMBY) questions raised about centralized renewable energy generation, it’s worth noting that we can generate a lot of power by covering already developed spaces. See California, where solar PV arrays cover parking lots, providing peak power and soothing shade for the shielded vehicles underneath. Not only are these… Continue reading
We’ve talked previously about the perversity of using tax credits to incentivize renewable energy production, increasing transaction costs and reducing participation in renewable energy development. But there are other perversities in U.S. state and utility renewable energy policies, especially with upfront rebates and net metering. Let’s start with rebates. Many states and utilities offer upfront… Continue reading
Key benefits of distributed power generation (DP). Proven technologies for DP are widely scalable. Obvious example: a wind farm can be incrementally built in multiples of approximately 1.4 MW. Bigger doesn’t necessarily mean “cheaper” for DP. Customers can match the DP capacities to precisely known needs and not have to over-buy equipment. (see Figure 1… Continue reading
An interesting graphic that shows how the definition of distributed generation can vary by technology, since one “module” of a wind power plant (~1.5 megawatts) is very different than one solar module (~250 Watts).
Image credit:Electric Power Systems Research 57 (2001) 195-204; Ackermann et. al.
When discussing centralized v. decentralized solar power, there’s an inevitable comparison between solar thermal electric power and solar photovoltaic (PV). But the fact is that solar thermal power – or concentrating solar power (CSP) – can also be done in a distributed fashion. In fact, of the 21 operational CSP plants in the world, 18… Continue reading