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Hybrid Generator Would Cut Military Base Fuel Costs in Half

The phrase "An army marches on its stomach," often attributed to Napoleon Bonaparte, underscores the importance of logistics in the military. And in the 21st century, keeping up the supply of diesel fuel is one of the most challenging logistical tasks for military forces in the field.

Last month, the U.S. Department of Defense (DoD) awarded a contract to a company that says its “hybrid generator” can reduce the amount of fuel used by generators at outposts by more than 50 percent. The company, Earl Energy, uses a rack of batteries coupled to diesel generators—and, if available, solar panels—to optimize fuel consumption. It’s one of a number of projects funded by the Department of Defense to reduce fuel consumption through efficiency and renewable energy.

Today, the U.S. military powers its operating bases with diesel generators that run continuously. The problem is that it’s difficult to match the generating capacity with the actual power load from air conditioners, electronics, and other gear, which fluctuates during the day and in different seasons. And when the demand for power is lower than the generator’s full capacity, the fuel efficiency drops off dramatically and the maintenance increases.

At the same time, the electricity requirements for bases in places such as Afghanistan have gone up substantially. Compared to a Marine battalion a decade ago, bases now have more than twice the number of radios and vehicles and three times the number of computers, according to the Department of Defense.

Earl Energy’s FlexGen “hybrid generator” is wired to a diesel generator running at full capacity, which is how it's most efficient. When there is excess power, the diesel generator charges the batteries. If the batteries have enough stored energy to meet the demand for electricity, then the generator shuts off. In tests in Afghanistan, the Earl Energy system allowed the generators to run three to six hours a day, compared with around the clock before it was installed, says Doug Moorehead, the CEO of Earl Energy.

A former Navy Seal, Moorehead saw first hand the perils of transporting fuel while stationed in Iraq. Fuel and water convoys are frequent targets. For example, in one three-month period in 2010, six marines were wounded during convoys (a rate of one injury for every 50 convoys). The financial cost is great as well; fuel can cost $2.64 to $3.96 per liter ($10-$15 per gallon) by the time fuel is delivered to outposts, says Moorehead. "If you reduce the fuel consumption, you can now cut [the number of fuel convoys] in half,” he says.

After Moorehead’s time in the Navy, the MIT graduate attended Harvard Business School and then went to work at lithium-ion battery company A123 Systems, where he worked in the grid energy storage group.

With funding from a previous Department of Defense program, Earl Energy was able to build prototypes for its energy storage device. It now has about a dozen units in the field, which are partially charged with energy generated by solar panels. The system’s control software can be used to manage multiple generators in order to create a base-wide microgrid.

The contract Earl got last month under the Mobile Electric Hybrid Power Systems (MEHPS) program is for delivery of products that conform to the Department of Defense's specifications and could lead to purchase of about 50 units, says Moorehead. "It shows that the DoD is very serious about hybrid generators," he says. (Another company, UEC Electronics, was also awarded a contract to build a generator that fits on a trailer and combines energy storage and solar power.)

Last fall, Earl Energy won another contract from the Army Communications-Electronics Research, Development and Engineering Center (CERDEC) to design power converters based on silicon carbide. "All existing power electronics are silicon-based but the next generation uses silicon carbide, which allows for much higher voltages and conversion efficiencies,” Moorehead says. The company expects its power converters, which will be used with its generators by the middle of next year, to be 80 percent lighter and 70 percent smaller than existing models.

Outside of the military, there is growing interest in distributed power generation, both in grid-connected and off-grid scenarios. Concerned that severe storms will knock out power for long periods, businesses and institutions such hospitals and universities are looking at on-site power generation with natural gas and solar. Meanwhile, microgrids can bring power to places in the world where there is not a reliable centralized grid, whether it’s remote parts of Alaska or rural villages in developing countries.  

Indeed, Earl Energy has ambitions beyond the military. This spring, it will begin testing a hybrid generator at a drill rig in Texas. This installation will use a design similar to the FlexGen hybrid generator, but it will include fast-acting ultracapacitors instead of lithium-ion batteries connected to a 1.2 megawatt generator. Oil and gas drillers typically use very large diesel generators, but drillers are looking for ways to use natural gas that is available from wells to save money and reduce emissions from their operations, Moorehead says.

Image credit: Earl Energy

EC Sees Heavy Pricetag to UK Nukes Plan

Government incentives for a pair of proposed nuclear reactors could cost U.K. taxpayers as much as £17.62 billion, thus exceeding the reactors' projected cost. The EC figure is a preliminary estimate included in an initial report to London published on Friday by European Commission competition czars. The letter notifies the British government that—as we predicted in December—Brussels is launching a formal investigation to assess whether the subsidies violate European state aid rules. 

The preliminary findings suggest that the U.K. and E.C. are on a collision source. As the Financial Times summed it up this weekend: "The severity of [the EC's] initial concerns will cast a shadow over government hopes to win approval for the deal."

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European Union Fanning Offshore Wind Energy in India

As India tries to power its emerging economy, it will look beyond coal  to offshore wind energy. And, it will be getting some help from the European Union, which will be coming up with a roadmap and help with financing.

The plan, which falls under the umbrella of the Global Wind Energy Council, focuses on the states of Gujarat in the northwest and Tamil Nadu in the southeast. It will be a four-year process, although the results will include projections up to 2032. The wind council says that the specific objectives are to lay the groundwork for offshore development through resource mapping, policy guidance, and capacity building measures. The stakeholders will also evaluate the infrastructure needs and make suggestions as to how to move the energy from offshore to the urban areas where it's needed.


The India-EU effort is called the Offshore Wind Power Development project, which is supported by a € 4 million contribution from the European Union’s Indo-European Cooperation on Renewable Energy program. India’s Ministry of New and Renewable Energy will be overseeing the work. Like Europe, India, would like to become less dependent of fossil fuels and to use more renewable energy, says the European Union’s Ambassador Joao Cravinho.  

Onshore wind energy is firmly planted in global markets. But offshore wind projects are mainly the domain of Europe, which is the host of roughly 6000 megawatts of capacity that have been installed in the North Sea, Baltic Sea, and Irish Sea. China, though, has made inroads in the offshore wind area, with Japan, Korea and Taiwan in the early stages of development. India has become the latest such nation to make forays.

The main obstacle is the high associated costs. In some cases, the price of offshore wind power is two-three times as high as onshore wind power, says Navigant Consulting. Industry, though, is working on deploying larger wind turbines to achieve better value.

The European Union has been a role model: Its offshore wind deals account for 10 percent of its annual wind energy installations, says the European Wind Energy Association. The goal, it adds, is to increase those levels from 6000 megawatts today to 40 000 by 2020 and 150 000 megawatts by 2030, or 14 percent of the EU’s electricity demand — considered by some experts to be impractical given the today’s cost.

The Smart Grid Needs an App Store, says Silver Springs Networks

With all the buzz around the Internet of Things, it’s easy to lose sight of the fact that the electricity grid already operates with millions of connected meters and sensors. Yet writing applications for these programmable machines is too hard, which blocks the full potential of the smart grid, says Silver Spring Networks.

The Silicon Valley-based company this week will introduce software designed simplify the process of programming meters and sensors on the grid and capturing the huge amounts of data they produce. It will launch the software, called the SilverLink Sensor Network, on Monday to coincide with the DistribuTech utility industry conference.

In the United States alone, there are more than 46 million smart meters installed, according to the Institute for Electric Innovation, and worldwide shipments of smart meters are expected to top 100 million per year in a few years. Often utilities ping smart meters every fifteen minutes to monitor customers’ power usage, generating mountains of data every day. There are a number of other connected devices that produce energy-related information, such as smart thermostats that work over home WiFi networks. Utilities, meanwhile, increasingly have sensors in grid equipment, such as transformers and power lines.

The problem is that collecting and analyzing streams of data from smart meters and other digital devices is expensive and slow, says Anil Gadre, the executive vice president of products at Silver Spring Networks. The result with smart meters is a situation where these two-way meters perform useful, but a fairly limited set of applications, such as automated bill reading or locating faults after a power outage. But the growing utility digital network could be used for a number of other applications that benefit both consumers and utilities, he says.

“Everybody expected that when they installed these giant networks in the smart grid that they’d get a whole lot more out of it than they already are,” says Scott Young, senior director for software applications and analytics at Silver Spring Networks. “If we unleash the data, it will look a lot more like the Internet is today.”

The SilverLink Sensor Network is cloud-based software that provides a set of APIs to access meters and other devices. The APIs create a gateway to these machines without forcing programmers to learn proprietary network protocols and data formats. That software effectively creates a platform on which Silver Spring Networks, utilities, and third-party application developers can write custom applications that uses smart grid data. Silver Spring Networks manages the APIs and hosts applications, much the way Apple or Google host app stores for smart phones and tablets.

Startup PlotWatt intends to use the software to collect and analyze meter data to tell people how much energy different appliances use and what the projected annual costs are. Similarly, another company called Bidgely itemizes electricity bills, compares your usage to other people's, and provides personalized recommendations on how to save energy.

Silver Spring Networks also signed on a few partner companies that intend to use the platform to create applications for utilities. For instance, startup AutoGrid uses data from different sources to generate more accurate power forecasts, alert utilities of line voltage problems, and run demand response programs to lower peak-time power use. 

For more applications like these to flourish, the programming model for the smart grid needs to change, says Gadre. Today, meter data is typically collected and placed in a database for analysis. But being able to query meters in near real time opens up new possibilities. For instance, a smart meter could communicate that power rates are very high and tell that home's electric vehicle charger to charge when rates are lower. Or the inverters that convert solar panels’ direct current to alternating current could make adjustments to make sure the voltage is stable on a power line. Utilities could also provide up-to-the-minute forecasts of monthly bills to consumers based on near real-time information.

It’s more likely that specialized software companies, rather than utilities, will develop these new types of applications, says Young. Utilities often lack the technical skills that a software company brings and many are struggling to effectively use the large amounts of data they now produce.

Silver Spring Networks makes the IP-based wireless networking built into smart meters, but it says its software can work with other networks. As a company, it’s trying to earn money by providing services, such as big data analytics, that make use of the existing infrastructure. “This giant network exists and it’s largely under-utilized," Young says.

Who Pays for Grid Expansions When Homeowners Generate Their Own Electricity?

Grid operators have met their match and it's a growing number of distributed generators—erstwhile electricity consumers who've ended their reliance on the grid because their needs are met by rooftop solar panels. But this exodus from the grid is occurring just as transmission systems are being expanded to prevent congestion and to handle more centrally-generated renewable energy. The utilities say the cost of these upgrades is the financial responsibility of everyone, including those who've become energy independent. Now state regulators are trying to find solutions.

On Wednesday, the system operator in Texas announced plans to spend billions to expand and upgrade the transmission lines crisscrossing the state. That decision has profound implications, considering that Texas is expected to see its power use rise by 2.1 percent a year compared with 1.5 percent for the rest of the nation.

The Electric Reliability Council of Texas (ERCOT), says it will, by 2018, plow $3.6 billion into fixing up or expanding a total of 16 different deals, amounting to 5300 kilometers of transmission lines. Some of those upgrades are needed to transport wind energy from remote locations to the urban areas where it is consumed.

Similarly, Northeast Utilities, which serves 3.6 million electric and natural gas customers in Connecticut, Massachusetts and New Hampshire, wants to add transmission infrastructure throughout its area and plans to spend $4 billion doing just that. It needs to make up for capacity shortfalls and to replace 2700 megawatts that will be lost by 2017 as several coal and nuclear power plants are retired. Meanwhile, new wind power generated in Maine is expected to come online and be transported into the utility's load centers in Boston.

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Carbon Capture Success in Alabama, $1 Billion Pledge in Illinois

Last week carbon capture proponents in the United States got two bits of good news. First, Mitsubishi Heavy Industries and Southern Company Services said they have successfully tested a technology that captures and sequesters carbon dioxide from coal plants. Later in the week, the U.S. Energy Department pledged to come up with about $US 1 billion for the $1.65-billion FutureGen 2.0 carbon capture and storage project in Illinois.

Based on the results released Tuesday, Mitsubishi Heavy says that it will accelerate its program to commercialize the technology. Southern Company owns the 2657 megawatt power plant in Alabama that the technology was tested on. The U.S. Department of Energy and the power industry’s  R&D  arm, the Electric Power Research Institute, also pitched in.

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Thermophotovoltaic Device Has Potential to Reach Huge Solar Efficiencies

Traditional photovoltaic solar cells have an inherent limit on the efficiency at which they can convert sunlight into energy. This limit—based on the bandgap of the material used and known as the Shockley-Queisser limit—is about 33.7 percent for standard solar cells. It is essentially due to any material's inability to respond to all wavelengths of sunlight; so what if there was a way to change the wavelengths that actually reach the cell to those it converts best? MIT researchers have unveiled the best-yet version of that idea, known as solar thermophotovoltaics. 

These modified solar cells place an absorber/emitter device above the cell itself. Sunlight is absorbed by this layer, it heats up—a lot—and emits light tuned directly to the bandgap of the PV cell beneath it. That means that much more of the energy in the sunlight can turn into electricity. According research in Nature Nanotechnology by graduate student Andrej Lenert and colleagues, this idea offers the benefits associated with both solar thermal power and traditional photovoltaics, and the ability to harness much of sunlight's spectrum and thus achieve extremely high efficiencies.

In theory, these devices could climb all the way toward 80 percent efficiency and beyond, though for now we'll have to settle for a mere 3.2 percent. Still, that is more than triple the efficiency of previous efforts, which have peaked at around 1 percent.

Among the reasons for the huge gap between potential and reality is heat. The new device's absorber-emitter reached a temperature of 962°C; at those temperatures, the devices are difficult to optimize and operate. The 3.2 percent achieved is a result, the investigators say, of the specific materials and design of the absorber-emitter: the outer layer uses an array of multiwalled carbon nanotubes, and the emitter portion is a photonic crystal layer made of silicon and silicon dioxide .

"Our device is planar and compact and could become a viable option for high-performance solar thermophotovoltaic energy conversion," they wrote in the Nature Nanotechnology. And it also has the potential to aid in energy storage, since heat is an easier stored form of energy than electricity. The prototype has reached 3.2 percent, but the group thinks 20 percent, which would put it in range with standard PV modules, is well within reach. In an e-mail, Lenert told me that "efficiencies beyond this level will require improvements in low-bandgap cells, as well as even better control of the thermally-driven spectral conversion process using wavelength and angular selective surfaces." The research center at MIT is pursuing those and other angles to bring this idea into popular use.

China’s Water Scarcity Aggravated by Shrinking Wetlands

China’s wetlands have shrunk by nearly 9 percent in recent years, and the loss could continue if the government doesn't intervene. Officials from China's State Forestry Administration (SFA) told reporters on Monday that 340 000 square kilometers of wetlands, an area the size of the Netherlands, has disappeared since 2003.

The loss of wetlands is not only a blow to the flora and fauna that thrive in the critical habitat, but also to the Chinese population, which already faces increasing competition between agriculture, energy and development.

According to a report in Reuters, the officials said the loss was due to a combination of agricultural needs, large infrastructure projects, and climate change,  In particular, Zhang Yongli, vice director of the SFA, told reporters on Monday that the wetland loss due to infrastructure projects has increased tenfold in the past decade.

Northern China has the most acute water shortages. Nearly half of China’s population lives in the north, but it has only 14 percent of the water. Across the entire country, 85 percent of water is used by agriculture and industry, according to the nonprofit China Water Risk.

About 70 percent the nation's electric power comes from coal-fired generators that require massive amounts of water to operate. And the needs of the energy industry are only expected to increase. World Resources Institute (WRI) reported that China has plans for 363 new coal-fired power plants that will all require water for thermal cooling. Although new coal plants require less water than older plants, they still require more water than natural gas combined cycle plants, solar PV, or wind power. About half of the proposed plants are in areas of high or extremely high water stress, according to WRI.

The story of China’s shrinking wetlands has been ongoing. A 2012 study [PDF] found that China lost 23 percent of its freshwater marshes and 51 percent of its coastal wetlands over the previous 60 years.

One of the issues is adequate enforcement of safeguards for the wetlands. According to Reuters, 9 billion yuan ($1.5 billion) was earmarked for wetland protection between 2005 and 2010, but only 38 percent of those funds were actually allocated. For the period beginning in 2011 and ending in 2015, that figure has risen to 12.9 billion yuan.

China is not without water; it has the world’s fifth largest store of freshwater, according to the Brookings Institution. However, that is not a lot when split amongst more than a billion people—especially taking into consideration that much of the water is in the sparsely populated southwest, rather than the bustling north.

To meet the rising demand, says the Brookings Institution, the Government has plans for a water transfer project from the south to the north—despite various technical and humanitarian challenges. In 2010, the government also drew three red lines to establish “clear and binding limits” on water usage and to increase agricultural efficiency by 60 percent in specific regions. But for wetlands, the Forestry Administration's Zhang told reporters, China still lacks a strong national policy.

"Current regulations and rules have some clauses on wetland protection, but most are in fragments and disorganized, far from meeting the need of our work,” Zhang told ECNS. “Provisions for investigation and supervision of land use, the punishment for lawbreakers and better performance of International conventions are still nearly blank. Thus, a set of practical and binding regulations, especially for wetland protection, is badly needed."

Photo: Sean Gallagher/Getty Images

Obama Administration Wants to Speed Up Hydrogen-Powered Vehicles

The “hydrogen economy” just got a nice push from the Obama administration, which is now partnering with the private sector to facilitate a fresh wave of fuel cells that can be used to power the transportation sector.

The U.S. Department of Energy announced at year end that it would spread a US $7.2 million investment across four states: Georgia, Kansas, Pennsylvania and Tennessee, all to support projects that fuel vehicles and support power systems. The administration says that it is part of its “all-of-the-above” energy strategy.

The winners:

  • The Center for Transportation and the Environment, which will get $3 million. Based in Atlanta, it is developing a fuel cell hybrid electric walk-in delivery van that has a 240 km range before it would need refueling. The project will also retrofit 15 UPS delivery vans with fuel cell hybrid power trains.
  • FedEx Express, which will receive $3 million. Headquartered in Memphis, Tenn., it is building a hydrogen fuel cell delivery truck with a range of up to 240 km on a full tank.
  • Air Products and Chemicals, which will get $900 000. The hydrogen supplier is located in Allentown, Penn. and is constructing a cost-effective tube trailer for hydrogen delivery and storage that can withstand high pressures.
  • Sprint, which will receive $250 000 to use hydrogen fuel cells as backup power for its rooftop cellular sites. In a press release the company says that it will focus on lightweight fuel cell system that can be easily installed without heavy cranes and that can be refueled from the ground, eliminating the need for transporting fuel to the rooftops.

At present, fuel cells are being adopted for materials handling equipment such as forklifts as well as in powering telecommunications infrastructure. As for the transportation sector, Honda, Hyundai and Toyota are all creating small numbers of fuel cell-powered cars that they say will be available by 2015 in Southern California. For its part, Toyota has said that it expects to produce “tens of thousands per year in the 2020s.” Cost for fuel cell vehicles have dropped by 50 percent since 2006 and 30 percent since 2008, according to the U.S. Department of Energy. Meanwhile, fuel cell durability has more doubled since 2005.

The advantages of hydrogen are that it is abundant, renewable and non-polluting. Water vapor is the only byproduct of a fuel cell and hydrogen-fueled vehicles have more twice the range of today’s electric vehicles. But it is difficult to store hydrogen, and it is about 30 percent more expensive to carry the hydrogen via pipelines than to carry natural gas.

The know-how exists but the cost of creating a new hydrogen-powered auto sector is prohibitive. By partnering with the private sector, the Obama administration thinks that it can create some success stories and speed up the process.

Photo: Chuck Burton/AP Photo

Polar Vortex Cripples Power Generation, But Grid Survives

As record cold temperatures plowed across much of the United States earlier this week, no piece of infrastructure was left unaffected. Trains were stalled, flights were cancelled, and schools were closed.

Although most people might not have noticed, the electrical grid was not immune to the effects of the cold snap. PJM Interconnection, the largest U.S. grid operator, hit a new record winter peak use of 141 500 megawatts. The peak energy use came at a time when nearly 20 percent of the generators in PJM's territory were down due to the frigid weather. On Wednesday morning, nearly 40 000 megawatts of PJM’s 190 000-MW installed capacity were offline.

Some of the generation losses were due to natural gas pipeline constraints, which caused gas price spikes across much of the United States. Natural gas is also the most predominant heating fuel in the U.S.; as more utilities build gas generators, they must compete with other natural gas needs during cold spells.

But natural gas availability was only a small part of the picture. Steam-cycle fossil fuel-fired power plants (primarily coal) made up about half of the outages, with diesel generators making up the second largest portion. 

 

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