[Due to the increasing size of the archives, each topic page now contains only the prior 365 days of content. Access to older stories is now solely through the Monthly Archive pages or the site search function.]
“Project Volt Gas Volt” proposes long-term financing plan to support widespread implementation of power-to-gas systems
June 02, 2013
|Project Volt Gas Volt is based on a long-term financing plan and the use of existing technologies for the large-scale conversion of surplus renewable electricity to methane, with subsequent reuse. Diagram: Isabelle Plat. Click to enlarge.|
Corinne Lepage, Member of the European Parliament (and former French Minister of the Environment) and Professor Robert Bell, Brooklyn University, City University of New York, are proposing Project Volt Gas Volt (VGV) as a technology pathway for using renewable energy to “keep the lights on” on the broadest scale without disruption, together with a long-term financing proposal for the project. Although they are targeting an initial implementation France, they see it as broadly applicable.
Project VGV uses surplus electricity generated by renewable and nuclear sources to produce hydrogen via electrolysis. The hydrogen is combined with CO2 to produce methane, which is pumped into and stored in the existing natural gas grid and used like natural gas for use in power generation, transportation, or other thermal and industrial uses. The concept is the same embodied in Audi’s e-gas project (earlier post), to which the VGV proposal makes continued reference.
German researchers improve catalyst for steam reforming of methanol with salt coating; enabler for renewable energy storage systems
April 19, 2013
Researchers at the University of Erlangen-Nürnberg (Germany) report in the journal Angewandte Chemie their development of an enhanced platinum catalyst for the steam reforming of methanol to release hydrogen.
A central problem of renewable energy technology lies in the great variation of energy generated (i.e., intermittency). One proposed solution is methanol-based hydrogen storage. In this scenario, excess renewable electricity can be used to electrolyze water to produce hydrogen. The hydrogen, in turn, is then reacted with carbon dioxide to make methanol and water, thus allowing it to be stored as a liquid. The hydrogen can be released from the methanol at a later time to power a fuel cell.
Stanford study quantifies energetic costs of grid-scale energy storage over time; current batteries the worst performers; the need to improve cycle life by 3-10x
March 10, 2013
|A plot of ESOI for 7 potential grid-scale energy storage technologies. Credit: Barnhart and Benson, 2013. Click to enlarge.|
A new study by Charles J. Barnhart and Sally M. Benson from Stanford University and Stanford’s Global Climate and Energy Project (GCEP) has quantified the energetic costs of 7 different grid-scale energy storage technologies over time. Using a new metric—“Energy Stored on Invested, ESOI”—they concluded that batteries were the worst performers, while compressed air energy storage (CAES) performed the best, followed by pumped hydro storage (PHS). Their results are published in the RSC journal Energy & Environmental Science.
As the percentage of electricity supply from wind and solar increases, grid operators will need to employ strategies and technologies, including energy storage, to balance supply with demand given the intermittency of the renewable supply. The Stanford study considered a future US grid where up to 80% of the electricity comes from renewables.
NTNU study finds ships’ and spare parts’ contribution to offshore wind power lifecycle impacts has been underestimated
March 04, 2013
A new analysis by researchers at the Norwegian University of Science and Technology (NTNU) suggests that, notwithstanding significant uncertainties, previous studies have underestimated the contributions from installation and use phases—e.g., “ships and spare parts”—to the total life cycle impacts of offshore wind power. Their analysis is published in the ACS journal Environmental Science & Technology.
In the study, they developed and assessed life cycle inventories of a the proposed Havsul I offshore wind farm in Norway using a hybrid life cycle assessment (LCA) methodology. The study put special emphasis on aspects of installation, operation, and maintenance, as these stages have been given only cursory consideration in previous LCAs, they noted.
Honda Transmission contracts with Juhl Wind for two utility-scale wind turbines at Ohio plant; up to 10% of electricity for operations
January 25, 2013
Honda Transmission Mfg. of America, Inc. announced an agreement with Juhl Wind, Inc. to develop, install, and operate two utility-scale wind turbines (each rated at about 2MW) to generate electricity for the plant’s operations.
The plant manufactures automatic transmissions, gears and four-wheel-drive systems, including the next-generation Earth Dreams transmission technology. The two wind turbines will supply up to approximately 10% of the plant’s electricity. Based on their location and actual wind speeds, combined output from the two wind turbines is estimated at 10,000-megawatt hours (MWh) per year.
Senate version of “Fiscal Cliff” legislation includes 12 energy tax extenders; boost for algae
January 01, 2013
Among the many extensions specified in the amended version of a House bill (H.R.8) passed by the US Senate on New Year’s Day by a vote of 89 - 8 to avoid the across-the-board increase in taxes currently called for by the “fiscal cliff” are a number for energy tax benefits.
The amended bill, now called the “American Taxpayer Relief Act of 2012” and next to be considered by the House, contains 12 extensions outlined in Title IV of the bill, ranging from extension of production credits for Indian coal facilities to benefits for alternative fuels (including algal biofuels) and plug-in vehicles. The Sections are:
Topping-out ceremony for the Audi e-gas plant; synthetic methane production to begin in early 2013
December 13, 2012
|Components of the e-gas plant. Click to enlarge.|
Audi is celebrating progress on its e-gas plant under construction in Werlte, Germany with a topping-out ceremony. End products from the plant will be hydrogen and synthetic methane (Audi e-gas), to be used as fuel for vehicles such as the new Audi A3 Sportback TCNG. (Earlier post.)
The Audi e-gas plant, which can convert six megawatts of input power, will utilize renewable electricity for electrolysis, producing oxygen and hydrogen, the latter which could one day power fuel-cell vehicles. Because there is not yet a widespread hydrogen infrastructure, however, the hydrogen is reacted with CO2 in a methanation unit to generate renewable synthetic methane, or Audi e-gas. Chemically speaking, this e-gas is nearly identical to fossil-based natural gas. As such, it can be distributed to CNG stations via the natural gas network and will power vehicles starting in 2013.