[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.]
MIT team engineers yeast to boost lipid production for biofuels
January 20, 2017
MIT engineers have genetically engineered strains of the oleaginous yeast Yarrowia lipolytica to boost the production of lipids by about 25% compared to previously engineered yeast strains. Their approach could enable commercialization of microbial carbohydrate-based lipid production, supporting the renewable production of high-energy fuels such as diesel.
A paper on their work is published in the journal Nature Biotechnology; the MIT team, led by Gregory Stephanopoulos, the Willard Henry Dow Professor of Chemical Engineering and Biotechnology at MIT, is now working on additional improvements to the lipids yield.
GM expands B20 biodiesel lineup with new cars, crossovers and trucks
January 18, 2017
General Motors is expanding its portfolio of B20-capable vehicles to include cars and crossovers, and will field the industry’s most expansive lineup of diesel-powered vehicles in 2017, John Schwegman, director of commercial product and medium duty for GM Fleet, announced at the National Biodiesel Conference.
Chevrolet offers the industry’s broadest lineup of B20-capable diesel propulsion for fleet, commercial and retail customers, including: Express full-size vans; Silverado HD full-size pickups; the Colorado mid-size pickup; the Low Cab Forward commercial truck; the 2017 Cruze compact car and the 2018 Equinox compact crossover.
EPA finalizes increase in renewable fuel volumes for 2017; 6% total increase to 19.28B gallons
November 23, 2016
The US Environmental Protection Agency (EPA) finalized increases in renewable fuel volume requirements across all categories of biofuels under the Renewable Fuel Standard (RFS) program. In a required annual rulemaking, the action finalizes the volume requirements and associated percentage standards for cellulosic biofuel, advanced biofuel, and total renewable fuel for 2017, and for biomass-based diesel for 2018.
The final volumes represent continued growth over historic levels. The final standards meet or exceed the volume targets specified by Congress for total renewable fuel, biomass-based diesel, and advanced biofuel. Total renewable fuel volumes grow 6% (1.2 billion gallons) from 2016 to 2017 to 19.28 billion gallons.
Chevrolet and GMC expand alternative fuel fleet offerings; expanded CNG/LPG lineup
November 22, 2016
Chevrolet and GMC are partnering with Power Solutions International, Inc. (PSI) to introduce heavy-duty pickups and full-size vans powered by 6.0-liter V-8 compressed natural gas (CNG) and liquefied petroleum gas (LPG)-capable engines starting in the first quarter of 2017. Chevrolet also will offer CNG and LPG versions of its new Low Cab Forward commercial truck.
The announcement follows the selection of PSI, based in Wood Dale, Illinois, as General Motors Fleet’s preferred upfitter for CNG and LPG trucks. PSI is one of North America’s largest and most experienced providers of integrated turn-key, alternative-fuel powertrain solutions.
EPA proposing updates to Renewable Fuel Standard
October 05, 2016
EPA is proposing updates to the Renewable Fuels Standard (RFS) regulations and related fuels regulations to better align the standards with the current state of the renewable fuels market and to promote the use of ethanol and non-ethanol biofuels.
Several of the proposed changes to the Renewable Fuel Standard program would align regulations with recent developments in the marketplace resulting in increased production of cellulosic, advanced and other biofuels, EPA said.
U-M study finds crop-based biofuels associated with net increase in GHGs; falsifying the assumption of inherent carbon neutrality
August 25, 2016
A new study from University of Michigan researchers challenges the assumption that crop-based biofuels such as corn ethanol and biodiesel are inherently carbon-neutral—i.e., that only production-related greenhouse gas (GHG) emissions need to be tallied when comparing them to fossil fuels.
In an open-access paper published in the journal Climatic Change, the researchers conclude that once estimates from the literature for process emissions and displacement effects including land-use change are considered, US biofuel use to date is associated with a net increase rather than a net decrease in CO2 emissions.
Biodiesel from engineered sugarcane more economical than from soybean
March 18, 2016
A techno-economic analysis by a team from the University of Illinois at Urbana Champaign and Virginia Polytechnic Institute and State University has determined that biodiesel produced from oil from genetically modified lipid-producing sugarcane (lipid-cane) is much more economical than biodiesel produced from soybean oil.
In their open-access paper, published in the journal Biofuels, Bioproducts & Biorefining, the researchers reported results showing that the biodiesel production cost from lipid-cane decreased from $0.89/L to $0.59 /L as the lipid content in the cane increased from 2 to 20%; this cost was lower than that obtained for soybeans ($1.08/L).