Micro Loans for Micro Power

Hundreds of thousands of people have electricity because of distributed generation from small renewable energy systems financed by micro lending:

The Solar Home System (SHS) dissemination programme in Bangladesh is considered to be one of the most successful of its kind in the world, bringing power to rural areas where grid electricity supply is neither available nor expected in the medium term.

The program started in January 2005 and nearly 350,000 SHSs were installed by last summer, most of which had a rated power output of 50W. Systems came with 3-4 compact flourescent light bulbs. Owners benefit from lighting, especially in their kitchens and courtyards, and also use the systems to charge batteries, power radios, and even run 12V televisions. While statistics are lacking, it appears that some owners are using the power in their small stores and restaurants, boosting their income.

This is a great program beautifully suited to regions without existing electrical grid infrastructure, and has the potential to have a lasting and powerfully positive impact on the energy poverty that afflicts much of the developing world. Even small amounts of electricity can change lives for the better by providing lighting for reading, heating and cooking that doesn't burn nasty fuels with toxic byproducts, and the ability to create a business, boosting the local economy.

Such an approach could work with micro hydropower too.

Laissez Failure

The slow-motion ecological catastrophe in the Gulf of Mexico is horrifying.

The oil slick is now the size of Ohio, and growing by the hour. Edges of it are now reaching land and all along the Gulf coast residents wait with deep foreboding and growing anger as the dimensions of the disaster become clear.

This is not an oil spill, but an oil spilling, as more ruptures from the sea floor, surfaces, and spreads its devastating reach towards shore. 40% of the coastal wetlands in the United States are under threat, as are the majority of the country's oyster and shrimp fisheries. Local fishermen have moved quickly through the 5 stages of grieving as they face the imminent destruction of their livelihood, economic security, their way of life, and their future.

Emergency response began quickly and broad efforts at mitigation are underway. The Obama Administration formed a National Response Team, Louisiana Governor Bobby Jindal is mobilizing the state's National Guard, and locals are taking to their boats to deploy booms to intercept the sprawling slick. Dealing with the immediate crisis is paramount now, yet soon hard questions must be asked, and honestly answered. The critical questions are:

Why did this happen? How do we prevent it happening again?

Distributed Hydropower for Remote Ocean Devices

There are many users who want to place electronic devices in remote ocean locations where power is not available from the electrical grid. These remote ocean devices (often sensors of some kind) are powered by batteries; however, today's state-of-the-art solutions are expensive and inconvenient.

For example, researchers at the University of Washington frequently want to deploy Acoustic Doppler Current Profilers (ADCPs) or other devices to take measurements under water over the course of weeks, months or longer. Running power through a cable from shore is impractical and costly, but the alternative actually used has a stiff price too: a disposable battery that costs $500 and lasts a mere 10 days, after which it must be replaced. In addition to the recurring cost of replacement batteries, there is the enormous cost of a boat and crew to do the replacement--often $1,000 per hour or more. In the deeper ocean farther form shore, boat costs can easily top $100,000 per day.

For small ocean power, the Hydrovolts turbine paired with a rechargeable battery replaces the current disposable battery solution, providing a capital ROI of substantially less than one year.

Our Energy Future - II

Where will our energy come from in the future? Peak oil is upon us, even if the exact date is not yet conclusively known. Nuclear power is at best a transitional step, and quite costly when factoring in construction and external costs. What's left?

How about 100% from renewable sources? A new report by PriceWaterhouseCoopers suggests Europe could be powered entirely by renewable sources, albeit at substantial cost of transition, especially on inter-continental transmission:

A "super-smart" grid powered by solar farms in North Africa, wind farms in northern Europe and the North Sea, hydro-electric from Scandinavia and the Alps and a complement of biomass and marine energy could render carbon-based fuels obsolete for electricity by 2050, said the report.

The goal is achievable even without the use of nuclear energy, the mainstay of electricity in France.

While the costs and challenges are great, those of clinging to the fossil economy would be much greater. But what is remarkable, of course, is that the modern industrial economy of Europe, roughly the same size as that of the United States, could be run entirely on renewable energy.

Thus, today's announcement by President Obama to expand off-shore oil drilling in the United States is especially disappointing.

Distributed Solar Generation

Earlier this month David Roberts at Grist reported that Recurrent Energy would announce a power purchase agreement (PPA) with Southern California Edison for 50MW of solar generation. The interesting part is that the deal involved three separate smaller-scale installations rather than one central array.

On their home page Recurrent says that they develop and operate solar power plants making 2-20MW. And:

Distributed-scale projects enjoy permitting and interconnection advantages that enable us to reach operating status quickly compared to central-scale projects.

We use proven solar technology to meet rising energy demand with a fleet of clean power plants located right where they’re needed most. Recurrent Energy is distributed solar power.

Electricity in the Developing World

The need for electricity throughout the developing world is immense and will continue to grow. Unlike in the industrialized countries, much of the developing world does not have large centralized power plants and transmission lines to carry that power to widely-spread users. Nor are they likely to ever have such a system:

Building out the power grid can be prohibitively expensive, which is why in many countries, like Haiti, less than three quarters of the population have grid access. Pike Research’s Clint Wheelock says just for the transmission portion alone it can cost at least $500,000 per mile. And that’s without the distribution portion and any kind of the grid intelligence (smart grid) that is getting all of the investment this year.

Distributed Generation

In the developed parts of the world we are all quite familiar with centralized electricity generation. Megawatts of high-voltage electrical power are created by large coal, gas, nuclear, or other installations and sent over the transmission grid to areas of large demand where it is transformed to lower voltage and distributed to individual homes and businesses.

The alternative is distributed or point-of-use energy generation. Water wheels have been used for thousands of years to create mechanical energy for grinding grain, sawing lumber, and pumping water for drinking or irrigation. Windmills have been used similarly. These and other technologies are still in use in much of the developing world today, along with distributed power from less sustainable sources like diesel generators.

Distributed and point-of-use generation have advantages and disadvantages over centralized power generation. Centralized generation requires an electrical grid, which is both costly and difficult to create since it demands an enormous right-of-way footprint. Our current electrical grid was developed higgledy-piggledy over time and increasingly reveals its growing decrepitude. It is less suitable to the many of the new forms of generation, especially variable renewable energy, like wind, which now comprises 40% of all new generation in the United States.

Restructuring our energy economy is a monumental, but critically needed undertaking. Promoting greater energy efficiency, developing utility-scale renewable energy generation and creation of a new, smart, electrical grid are important certainly, but getting less visibility is the rediscovery and resurgence of distributed energy, especially that based on sustainable sources. Distributed renewable energy generation has a huge potential market where there is no electrical grid, primarily in the developing world, but also in off-grid locations such as remote communities, military and offshore marine uses, and isolated scientific or other installations.

Distributed renewable energy generation will also often make sense even alongside centralized generation and grid distribution for several reasons:

• Operating cost: where there is no fuel expense the operating cost of distributed energy can be very low, limited only to maintenance and financing. Where excess is generated, it can be reverse-metered and make money.
• Environment: as the likelihood of the introducing some carbon tax or cap-and-trade system grows, a carbon-neutral solution gains appeal.
• Security and independence: locally produced and used power is not as subject to disruptions from foreign fuel supplies, labor unrest, hostile state or terrorist action.

There are many distributed generation approaches, both new and re-imagined from older ideas. Apart from small solar and small wind, which are quite widely recognized and have decades of recent installations, there are some intriguing others:

• Capturing every-day human power, e.g. from revolving doors
• Piezoelectric harvesting from walking on floors
• Updating the mill pond to use small hydro
• Novel solar collection sites, like sidewalks (but what about dirt?)
• Motion-to-energy from normal human activity
• Backyard nuclear plants (Isaac Asimov would be thrilled!)

The ones that capture human power are especially tantalizing, since they appear at first to be free and nearly limitless from something otherwise wasted. However, I can't help but wonder if we were drawing energy from all our kinetic activities all day long, wouldn't we get rather hungry? No free lunch (or breakfast or dinner) means that the operating costs are just hidden in another way. Energy that comes from nature, however, be it flowing water, waves, solar, etc. does not require any significant input of human productivity to generate on a day-to-day basis. This is why we're so bullish on in-stream hydrokinetic power, and started our company Hydrovolts to make a product to harvest it.

The biggest disadvantage of distributed energy generation is capital cost. Economies of scale have largely favored centralized generation; to be cost-effective, distributed energy generation solutions must be simple, mass-produced, easily transported and require minimal installation time and expertise. Lots of companies, including ours, are seeking to create just these kinds of products.

The current political and economic debate rightfully focuses on building the energy infrastructure that will both create a current economic stimulus and to lay a foundation for future growth and prosperity. President-elect Obama, as well as many think-tanks, institutes, and progressives--call them the Obama Ohana--cheer large-scale and large-dollar solutions for enormous renewable energy projects and massive smart grid building. I support these, but a similar impetus should also be given to partially decentralizing energy generation. A federal investment bank providing grants and loan guarantees, like a clean energy bank modeled on the very successful Ex-Im Bank, would be a powerful and cost-effective measure to nurture good ideas into the next generation of businesses to solve our nation's energy needs, rebuild our industrial base, and create jobs.

Not all big problems need big solutions. In an era when "too big to fail" should imply too big to exist, it's time to start thinking and acting locally.

Solving the Variability of Renewable Power

An oft-repeated problem with renewable sources such as wind, solar, wave, and tidal is that they are variable. When the wind is not blowing or the sun is not shining then they don't produce power; conversely, there are times where more power could be produced than could be used. This variability, often exacerbated by its unpredictability, has significant implications, especially for utility-scale generation that is connected to the electrical grid.

Current grid management is, in its simplest form, the matching of electrical generation and electrical use, the matching of supply and load. Electrical grid managers are able largely to rely on the load profile, the historical variation of the load over time. There are two basic techniques today to match generation and load: generate additional electricity from various sources when needed (the usual approach) or reduce demand (demand response, much less common.) A detailed explanation can be found here:

The power utilities are able to predict to a reasonable accuracy (generally to within one or two percent) the demand pattern throughout any particular day. This means that the free market in electricity is able to schedule just enough base load in advance. Any remaining imbalance would then be due either to inaccuracies in the prediction, or unscheduled changes in supply (such as a power station fault) and/or demand. Such imbalances are removed by requesting generators to operate in so called frequency response mode (also called frequency control mode), altering their output continuously to keep the frequency near the required value.

The grid frequency is a system-wide indicator of overall power imbalance. For example, it will drop if there is too much demand because generators will start to slow down slightly. A generator in frequency-response mode will, under nominal conditions, run at reduced output in order to maintain a buffer of spare capacity. It will then continually alter its output on a second-to-second basis according to the needs of the grid.

This spinning reserve is a significant expense to the power utilities as often fuel must be burned or potential power sales lost to maintain it. The kind of generation used for fast response is usually fossil fuel powered which produces emissions of between 0.48 and 1.3 tonnes of CO2 equivalent for every megawatt hour (MWh) generated. Thus a significant environmental burden, in the form of increased greenhouse gas emissions, is associated with this imbalance.

Most forms of generation are unsuitable as peaking power plants (peaker plants, spinning reserves) because they cannot be efficiently started/stopped or operated on an intermittent or sudden demand basis. As a practical matter, only natural gas turbine generation can serve as peaker plants. This is the core reason why T. Boone Pickens, Chesapeake Energy and others are so interested in wind power--it will increase demand for natural gas.

Thus the paradox: the desire to add renewable sources of electrical generation is motivated in part by the need to mitigate climate change; however, the addition of variable renewable sources increases the need for spinning reserves, which currently adds to the carbon problem.

What to do? What other than natural gas, with its carbon footprint problems, could serve as a spinning reserve or, more broadly, as a peaking power plant or some kind of load following capability from storage that would enable near-instantaneous supply increases to respond to changes in the electrical demand?

An alternative is grid energy storage. With the growing interest in and development of electric vehicles, especially plug-in hybrid electric vehicles (PHEVs) some have suggested that a growing array of distributed batteries in PHEVs could serve as a source of additional electricity in periods of high demand.

The concept, called vehicle to grid (V2G), is based on the fact that your car is typically not being used 90 percent of the time. "What if it could work for you while it sits there?" said Jeff Stein from the University of Michigan.

The National Science Foundation has granted a research team lead by Stein $2M to explore the possibility of V2G technology using PHEVs. There are many problems to be solved, however. The cars would need to be plugged into a socket not just when being charged, but also so electricity could be drawn back out. How would this be controlled? No PHEV owner will be happy to wake up in the morning and find the battery (half-)drained after being plugged in all night, presumably charging. There are (potentially significant) efficiency losses in charging/discharging batteries, and the life of the batteries would likely be shortened by an arbitrary cycle where complete charge or discharge may not occur. Lastly, there would need to be substantial elements of a future smart grid deployed to even allow this distributed storage to be harnessed in a centralized way. Interestingly, there is already a test of this concept underway at the University of Colorado (Boulder) by Xcel Energy. Other tests are also underway by Southern California Edison, Austin Energy, Duke Energy, Wisconsin Power, Excel Energy, and Pacific Gas & Electric, amongst others.

Hydro is another mostly green approach. Here in Washington state we get about 70% of our electricity from conventional (big dam) hydroelectric power, which has the ability to serve as a peaker plant by letting more or less water flow out of the reservoirs and through the turbines. There is competition for the water, however, especially from irrigation, but also from navigation and fisheries concerns, so the degree to which these dams can serve as peaker plants is somewhat limited.

Pumped storage hydroelectricity is another storage mechanism that might be explored, and may be very well-suited in coastal settings with large amounts of ocean energy generation (offshore wind, wave, etc.) Some of the drawbacks of this form of energy storage would be mitigated by a reservoir built for the purpose, rather than the use of a pre-existing (freshwater) lake.

Storage could also be achieved via flywheel arrays, hydrogen generation, compressed air, or other techniques.

Longer term, an updated, expanded, and smarter electrical grid is necessary. Wind generation is more variable the more local the scale and geographic reach of the turbine array. As more wind generation comes on line in greater density and over a more diverse, interconnected geographic area, local variations even out and become less significant. Offshore wind, despite its higher cost has several significant advantages over onshore wind; a large one is greater wind (power) on a steadier basis. Large coastal arrays (example) would take out some of the variability.

Construction Costs per Watt

Bizjournals.com:

SolFocus Inc., a provider of concentrator photovoltaic solar energy solutions, said
Monday it signed a $103 million agreement to install more than 10 megawatts of
CPV solar energy projects in several sites across southern Spain by the end of
2010.

Mountain View-based SolFocus' said its CPV systems use a combination of
"high-efficiency PV cells and advanced optics to provide high solar energy
yields at competitive costs for commercial, industrial, and utility
applications."

$10.30 per watt in construction costs? Could it really be spendier than offshore wind?

I'm hunting for reliable numbers on the typical per-watt construction costs of different kinds of commercial-scale electrical generation technologies, so far with little success. I've looked through the mountains of data at the Energy Information Administration, googled at length on the Handy-Whitman index (amongst other terms)--without much success.

Any readers have suggestions on where to find this data?