17 March 2016, Science Daily, Biogas: The flexible way to greater energy yield. Biogas is an important energy source that plays a central role in the energy revolution. Unlike wind or solar energy, biogas can be produced around the clock. Could it soon perhaps even be produced to meet demand? A team of international scientists, including microbiologists from the Helmholtz Centre for Environmental Research (UFZ), scientists from Aarhus University and process engineers from the Deutsches Biomasseforschungszentrum (DBFZ), have been studying the feasibility of this kind of flexible biogas production. Among their findings, for example, is the discovery that biogas production can be controlled by altering the frequency at which the reactors are fed. If the intervals are longer, more biogas is produced, according to the researchers’ paper in the Applied and Environmental Microbiology journal. Biogas production has long been a valuable technology, as the constant feed of organic raw materials such as energy crops, manure, sewage sludge, catch crops and plant residues helps produce energy around the clock. The ability to produce energy at a constant rate is a clear advantage over other renewable energy sources such as wind or solar energy, which depend on the wind or sun for production. As a result of this ability, Germany currently has around 8,000 biogas plants installed, with a total electricity output of approximately 4,500 megawatts. Around seven percent of the electricity generated in Germany now comes from biomass. It is hoped that even more electricity will be produced from this source in the future. Scientists from the UFZ, the University of Aarhus (Denmark) and the DBFZ succeeded in increasing the production of methane, the most valuable component of biogas, by up to 14 percent… Read More here
Tag Archives: Renewables
17 March 2016, Renew Economy, What will shake Malcolm Turnbull from his climate coma? First, the good news. According to the International Energy Agency, energy-related carbon dioxide emissions stayed flat for the second year in a row in 2015 – a clear sign that the nexus between economic growth and increasing energy emissions has been broken.The IEA says that the two biggest economies and energy consumers, the US and China, both achieved significant cuts in the last year (by 2 per cent and 1.5 per cent respectively), as coal-fired generation was replaced by gas in the US, and by wind and solar and energy efficiency in both countries. And the world can do more, says the International Renewable Energy Agency. By doubling its capacity in renewable energy – principally wind and solar – by 2030, the world can keep on track to meet its Paris climate targets, save $4.2 trillion in fuel, boost its GDP by $1.3 trillion and generate some 9 million jobs. Too easy. But here’s the bad news. While the world’s two biggest emitters are managing to bring their energy emissions under control, those of Australia are continuing to soar – by around 4.5 per cent since the Coalition government dumped the carbon price nearly two years ago. Coal generation, declining in US and China, is rebounding in Australia. Large-scale renewable energy investment has come to a complete standstill under any policy over which the Coalition government has control. Indeed, it is nearly a year since a compromise deal was reached on the large-scale renewable energy target – cutting it from 42,000GWh to 33,000GWh, and more than six months since Malcolm Turnbull raised hopes of a turnaround when he became prime minister. Turnbull declares himself entirely satisfied with the status quo, possibly encouraged by the fact that while 47 per cent of people say that climate and clean energy policies might influence their vote, more than half say it won’t. “We have effective and responsible climate change policies that are working,” Turnbull told parliament on Wednesday. “We are on track to beat and meet our 2020 emission reduction target. Our 2030 target is responsible and in line with that of comparable countries.” Turnbull was speaking in response to a question from Greens MP Adam Bandt, who asked if Turnbull agreed with the assessment of chief scientist Alan Finkel, who on the same day that new data showed a stunning rise in average global temperatures, said that under current policies we are losing the battle against climate change? Read More here
11 March 2016, YALE Climate Connections, Aspen 3rd City in U.S. to Go 100% Renewable. Aspen, Colorado . . . home to a winter playland of skiing, snowshoeing, trekking, and now, 100 percent clean energy. Aspen started transitioning away from fossil fuels in the 1980s with two hydroelectric dams. Then last summer, the city purchased enough wind energy to meet the last 25 percent of its energy needs – the equivalent of taking 4,000 cars off the road for a year. Aspen joined Burlington, Vermont and Greensburg, Kansas in relying solely on clean energy. David Hornbacher, Aspen’s director of utilities and environmental initiatives, says although every community is unique, each one can put together a portfolio of clean power. HORNBACHER: “We’re the third municipal electric utility in the nation to achieve this and each did it by a different route. So let’s let each of these organizations inspire others to find their path to one-hundred percent renewable.” Now Aspen’s renewable energy portfolio includes wind, water, and solar power. By using the forces of nature to power the community, Aspen hopes to inspire other communities to take action. Read More here
8 March 2016, Energy Post, New data debunks clean energy claims Apple, Amazon, Google. Recent claims by owners of large data centers that a large part of their operations are powered by renewable energy have skeptics coming out of from under their solar panels. Now, there is hard data proving that skepticism is valid, writes energy consultant and author Jim Pierobon. He applauds the efforts of companies like Amazon, Apple and Google to strive for clean energy, but calls for more transparency on their actual practices. A recent report by Lux Research casts a large shadow on some data centers’ clean-energy claims. Scientists at Lux Research found the data centers frequently draw on far more coal-fired power with its much higher emissions than renewables. Companies such as Google, Amazon and Apple should be careful about the claims they make, lest they come across partly as PR stunts. Amazon’s claims are off-base in 23 of its data centers in Virginia. It is less than transparent about how it calculates its emissions “They aren’t doing as much as they claim about sourcing their electricity,” said Ory Zik, Lux Vice President of Analytics. Full-time Data centers need a lot of power to run 24/7. They cannot rely on the intermittent supplies that come from solar and wind energy systems. As a result, they must draw electricity from the regional power grid. Solar and wind systems they have deployed or are developing can help supply renewable power to their centers and to power grids. But they supply nowhere near enough electricity on their own to run operate data centers reliably full-time. Read More here