SPECTRUM: “Swarm Electrification” Powers Villages in Bangladesh

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SOLshare’s power controllers link up homes or businesses to form a DC distribution grid. Image: ME SOLshare

Bangladesh hosts the world’s largest collection of off-grid solar energy systems. Rooftop panels and batteries electrify over 4 million households and businesses there. The Dhaka-based startup ME SOLshare believes it has the technology to link these systems and foster a solar energy-sharing economy. If the company succeeds, home systems will morph into village minigrids, offering wider access to more power at lower cost.

SOLshare’s European founders—Sebastian Groh, Hannes Kirchhoff, and Daniel Ciganovic—conceived their “swarm electrification” power-sharing platform during grad-school brainstorming sessions in Germany and California. The three moved to Dhaka to define, engineer, and launch their product, starting with power measurements in off-grid solar homes.

What Groh and his cofounders discovered upon arrival in 2015 was plenty of spare power going to waste. Typically, the batteries in home systems are sized to capture the power generated during the relatively dim monsoon season. As a result, during much of the year there is extra power available that isn’t captured. On average, about 30 percent of each system’s potential output is lost.

SOLshare’s technology is designed to share this extra power.  A smart power controller, called a SOLbox, is installed in each home or business and linked with cables to other local SOLboxes to form a DC distribution grid. The SOLbox enables users to set how much power they want to share with or draw from the network, and at what price…



Rumble Royale: Can the U.S. Grid Work With 100% Renewables?

Four Days in 2055: Dynamic heat and power supply in the mid-century wind, water and sunlight-fuelled Continental U.S. simulated by Stanford’s Mark Jacobson. Credit: ASU/PNAS

A battle royale between competing visions for the future of energy blew open today on the pages of a venerable science journal. The conflict pits 21 climate and power system experts against Stanford University civil and environmental engineer Mark Jacobson and his vision of a world fuelled 100 percent by renewable solar, wind, and hydroelectric energy. The criticism of his “wind, water and sun” solution and an unapologetic rebuttal from Jacobson and three Stanford colleagues appear today in the Proceedings of the National Academy of Sciences (PNAS).

The critics enumerate what they view as invalid modeling tools, modeling errors, and “implausible and inadequately supported assumptions” in a projection of the mid-century U.S. energy supply that Jacobson and his coauthors published in PNAS in 2015. “The scenarios of [that paper] can, at best, be described as a poorly executed exploration of an interesting hypothesis,” write the experts, led by Christopher Clack, CEO of power grid modeling firm Vibrant Clean Energy.

Clack says their primary goal is accurate science, the better to equip policymakers for critical decisions: “We’re trying to be scientific about the process and honest about how difficult it could be to move forward.”

The text and statements by Clack’s coauthors question Jacobson’s evaluation of competing energy technologies, and specifically his rejection of two non-renewable energy options: fossil fuel power plants equipped to capture their own carbon dioxide pollution and nuclear reactors.

Jacobson calls Clack’s attack, “the most egregious case of scientific fraud I have encountered in the literature to date.”

In fact, while both sides claim to be objectively weighing the energy options, the arguments and backgrounds of the protagonists belie well-informed affinities for various energy sources (and informed biases against others). As sociologists of science would say, their choice of data and their reading of it reflects hunches, values, and priorities.

Consider Clack’s coauthor Ken Caldeira, a climate scientist at the Carnegie Institution for Science. Caldeira’s press release broadcasting their critique argues that removing carbon dioxide from the U.S. power supply is a massive job demanding the biggest tool box possible: “When you call a plumber to fix a leak, you want her to arrive with a full toolbox and not leave most of her tools at home,” says Caldeira.

The same document then abandons this technology-agnostic tone to call out nuclear energy and carbon capture as technologies that “solving the climate problem will depend on.” And Caldeira has appealed for deploying a new generation of nuclear reactors which he and other nuclear boosters such as former NASA scientist Jim Hansen say are needed because renewables “cannot scale up fast enough.” Continue reading

Clim’ City Animates the Climate Challenge

clim_city2French science center Cap Sciences takes flash-based learning to new heights in a free online game launched this week: Clim’ City (click Le Jeu to play). At present this climate change adventure is for those of you who read French or set learning to do so as a New Year’s goal. But here’s to hoping that Bordeaux-based Cap Sciences gets an English version out quick because this educational game is a beautifully crafted and ingeniously programmed device for learning the contingencies and costs that lie ahead on the road to a low-carbon energy future.

The action in Clim’ City takes place on a small map of an imaginary town animated by commuters driving here and there and all manner of agricultural, industrial and even entertainment operations (including a ski hill) energetically going about their business. The goal is to reduce the “Clim’s” carbon footprint and thus avert the town’s demise by tweaking the way its actors produce and consume energy.

Playing such games turns information into knowledge. According to the international Association of Science-Technology Centers’s program International Action on Global Warming, the gamers at Cap Sciences hope players will do some informed pondering of such questions as:

Why is global climate change accelerating? What kind of climate can we expect by the year 2100? What human activities contribute most to the emission of greenhouse gases? And how is it possible to reduce these emissions?

In my first stab at Clim’ City I have converted the town’s carbon-belching coal-fired power plant to biomass. To do so I was forced to first launch a forest management program, which really brought home the fact that collecting biomass to generate a meaningful amount of energy is, in itself, a substantial and complex task.

My powerplant conversion also came with an opportunity cost, drawing down my limited supply of government, corporate, and individual action points. In the words of International Action on Climate Change, this was a powerful reminder of the “sociopolitical constraints” facing decision makers today.

I’m not deep enough in to Clim’ City to know whether mine is going to make it. If accounts in the French press and blogosphere are to be believed there’s a good chance it won’t. This is a tough game and failure appears likely — at least early on — which imparts a healthy dose of realism.

But even if the Clim’s get cooked under my leadership, I can’t help learning.

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This post was created for the Technology Review guest blog: Insights, opinions and analysis of the latest in emerging technologies

Nukes, Gas, Oil and Coal All Losers in EU Energy Strategy

The European Commission issued its Strategic Energy Review yesterday, proposing energy efficiency investments, a shift to alternative fuel vehicles to end oil dependence in transport, and more aggressive deployment of renewable energy and carbon capture and storage to “decarbonise” the EU electricity supply. Figuring prominantly among its first six “priorities essential for the EU’s energy security” are the North Sea offshore electric power supergrid that Energywise covered in September and the Mediterranean Ring electric interconnection of Europe and North Africa that I’ve been harping on this week. 

The EC energy strategy not only endorses the MedRing, but views it as a component of a future supergrid traversing Europe and stretching beyond the Mediterranean to Iraq, the Middle East and Sub-Saharan Africa.

How would this new vision (and $100/barrel oil) alter the complexion of European energy consumption? The energy review projects that by 2020 total energy demand drops from the equivalent of 1811 metric tons of oil in 2005 to 1672 MTOE in 2020. Demand met by renewables such as wind, solar and hydro more than doubles in real terms from 123 to 274 MTOE, while their share of total demand leaps from 6.8% to 16.4%. Imported renewables – with the MedRing delivering North African wind and solar power – jump 10-fold from 0.8% in 2005 to 8.8% in 2020.

Oil, gas, coal and nuclear, meanwhile, all see a diminished role, both in real terms and as a share of European energy demand. Interestingly the role of natural gas – the low-carbon fossil fuel – drops the most, from 25% to 21%, reflecting EU concern over dependence on gas imports from Russia. Nuclear’s share drops the least, from just slightly over to slightly under 14% of demand; this assumes that nuclear phaseout plans, particularly Germany’s, are followed through. 

How to make it all come true? Accompanying the EC review is a ‘green paper‘ (the EU’s unbleached alternative terminology for what we’d call a ‘white paper’) outlining a variety of new regulatory and financial mechanisms. The EU is already a world leader in terms of incentives for lower carbon energy with strong price supports for solar and wind and a carbon cap and trade program up and running (though still lacking teeth as my Energywise colleague Bill Sweet notes). However, the energy review warns that the primarily national-level financing that drives energy projects today are inadequate to drive infrastructure that is pan-European or larger. A perfect example is the massive investment in high-voltage dc lines needed to turn the MedRing into a bulk power mover (see the second half of our feature on MedRing: “Closing the Circuit”). 

Even less viable under existing financing mechanisms are those projects that entail considerable “non-commercial risks” such as threats of political instability or terrorism. Did someone say North Africa?

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This post was created for EnergywiseIEEE Spectrum’s blog on green power, cars and climate

CO2’s Bottom Line Just Keeps On Rising

Climate change skeptics obsess about the immense uncertainties that plague climate modeling. It’s not, however, all a matter of mysterious physics and chemistry. Human behavior — in this case our boundless capacity to ignore grave danger — poses the greatest challenge. No order of scientific progress nailing down the links that regulate Earth’s climate will enable certain projections of climate change over the next century because it is human behavior that controls the most powerful element: emissions of greenhouse gases such as CO2 and methane.

Today scientists with the international Global Carbon Project are releasing an updated accounting of CO2 emissions, and they far exceed the best guesses of human behavior by the Intergovernmental Panel on Climate Change (IPCC). “Emissions in 2007 were at the high end of’ those used for climate projections in the last [IPCC] report,” says Global Carbon Project participant Corinne Le Quéré, an environmental chemist at the University of East Anglia.

Emissions from burning fossil fuels and cement manufacturing — the largest sources of anthropogenic CO2 — continue to increase rapidly (see graph above); in 2007 they were now 38% higher than in 1990. In total, emissions drove up the atmospheric concentration of CO2 by 2.2 parts per million last year, compared with 1.8 ppm in 2006. At the end of 2007 CO2 was at 383 ppm — the highest concentration during the last 650,000 years and probably during the last 20 million years according to the Global Carbon Project. 

At the same time the oceans, which in past acted as a buffer to absorb excess CO2, are saturating. Le Quéré, who coauthored a report last year in Science that the Antarctic Ocean had already saturated, calls it a dangerous combination: “If this trend continues and the natural sinks weaken, we are on track towards the highest projections of climate change.”

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Buckle Down: Climate solutions won’t come at the push of a button

The message of the day seems to be Get real: Reversing, stopping or even just slowing climate change is going to take a little more effort than some newcomers to the problem hoped.

Kicking it off was the report one week ago that atmospheric concentrations of CO2 grew 35% faster than expected since 2000. Climate trackers at the University of East Anglia estimate that Earth’s plants and oceans scrubbed 18% less CO2 from the air, largely due to stronger winds in Antarctica’s Southern Ocean that bring deep CO2 up and thus prevent more CO2 from being absorbed. Greater than expected CO2 releases from the boom in coal-fired power generation and a dearth of technological advances contributed the balance of the CO2 speed-up.

I’m throwing a little more warm water on our melting optimism today with a story on the newly relaunched web portal MSN Green. “Does Daylight Saving Time Really Save Money?” is really an accounting of the energy savings Congress promised when it extended DST by three weeks in March and one week in the fall (this week in fact). When Congress passed the Energy Policy Act of 2005, it predicted that springing forward earlier and falling back later would trim the use of lighting, saving the equivalent of 100,000 barrels of oil per day. Extending DST probably did just the opposite, boosting energy use by giving us all more time to consume. 

The shortfall is grave given that extended DST was one of the only energy efficiency measures in the 2005 law, which focused mostly on boosting fossil fuel production and nuclear power. Remember Vice President Dick Cheney’s famous comment dissing energy efficiency as a “lifestyle choice”? Well, Congress went along for the ride.

The take home message is not that a smarter, climate-friendly energy system is impossible. Rather, we need to get beyond hopeful quick fixes such as DST and begin implement the real solutions that those East Anglia researchers found to be under-exploited — from true energy efficiency measures such as hybrid vehicles to renewable energy sources such as wind and solar power and even smarter use of fossil fuels whereby CO2 is captured and stored away underground. Let’s get real.

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