Tuesday, June 4, 2013

Tech Talk, Round 3: Salty Solar Storage

In what amounts to a huge win for solar power, two of the largest planned solar projects in the United States have officially been given the green light for construction by the Department of the Interior.  They include a solar power tower with molten salt storage in Arizona, and a huge photovoltaic (PV) plant in Nevada.  Together, the two installations have the potential to produce close to 450 megawatts (MWs) of power, which is enough to power almost 135,000 homes!  For this round of tech talk, I'd like to talk about one of the most innovative parts of the solar power tower in Arizona, its molten salt energy storage system, and why this technology is innovative and inventive (and useful, too!).

One of the biggest issues that detractors can use to argue against the increased use of solar power is its intermittency.  By its very nature, solar power is diurnally-based.  When the sun isn't shining, the system isn't generating power.  Additionally, the system's power capacity fluctuates according to changing weather conditions: passing clouds or cloudy days can substantially reduce the available power output from PV panels, causing spikes or lulls in energy production.  This means that a solar PV system by itself requires a backup power source to ensure a smooth energy distribution curve, increasing the cost of electricity to homes and businesses alike.  Let's take a look at this graphically to understand this a bit better:


As you can see, solar power's production potential is typically highest during a time of the day when energy use is rather low, and vice versa. However, this fact presents opportunities as well.  If the excess energy generated by PV panels during the middle of the day could be stored, then that energy could be spread over a longer time period and provide even more benefit to consumers while simultaneously reducing the use of expensive backup power sources.

It is this concept that has led to advancements in solar thermal plant design. Instead of using photovoltaics to generate electricity, a solar thermal plant instead uses the sun's rays to generate heat. The Arizona solar plant utilizes a relatively new application of an older technology, molten salt, to help store the excess energy produced by the sun.  Molten salt is a combination of potassium and sodium nitrate heated to very high temperatures.  The reflected energy from the sun is used to heat this salt to approximately 1,000 degrees Fahrenheit, and that heat is used to create steam to turn turbines and generate power.  If left by itself the salt loses less than 1% of its heat overnight, which means that the system can remain hot for 2 months even if all of the solar panels suddenly went offline!  However, the designers of the system anticipate using the heat from the salt to generate enough energy so that all the heat will be used up overnight.


Source:  treehugger.com

The use of molten salt in the solar tower means that there is enough energy for an additional 10 hrs worth of energy production from the solar facility even after the mirrors have stopped reflecting sunlight for the day.  This allows the solar system to be more flexible in its energy generation, depending on the needs of the utility.  Since Las Vegas (the city that the plant will service) is by its very nature more active at night, this plant can help to alleviate some of the greater energy usage by its denizens at any hour of the day.  

Energy storage is an important technology for making sure solar power can provide an efficient, steady flow of energy.  As new advances in storage, like molten salt, become economically feasible, they can provide a way for solar power producers to match their distribution curves to typical energy use patterns.  I imagine that PV panels could be used to heat mini salt storage systems as well:  the excess electricity generated by panels during the daytime hours can be used to heat the salt, and then the heat from the salt generates electricity at night.  It's an exciting technology development, and hopefully it ends up being one that can become widely used and accepted as well.

Friday, May 17, 2013

Solar in our Schools: The National Solar Schools Census

Sorry for the delay in getting my blog posts out regularly:  grad school and internships have eaten up a lot of my time over the past 9 months!  However, since I have a few days before my next internship kicks in, I wanted to write a post about a really cool new effort currently being undertaken in the solar community.

Solar power will be an important source of energy for future generations to harness to meet their energy needs.  However, because solar power is a relatively nascent energy subsector, it doesn't have as much credibility with the public, largely because many people don't quite understand how solar panels work, or the benefits they can provide to their wallets.  To their credit, a number of schools around the country are working to install solar panels on their campuses, so that students can learn about solar power at a young age and become more familiar with the process of energy generation from the sun.  Solar panels have ancillary benefits for the schools themselves as well:  solar power lowers energy bills for school districts, which means that schools can then allocate the money saved on energy to repairs for dilapidated buildings, or even to programs that may have been canceled or cut from stressed budgets in prior years.

One of the biggest methods of spreading the benefits of solar power is through word of mouth.  If individuals, businesses, or schools hear about the savings other entities have reaped through investing in solar power, they are more likely to invest in the same technologies as well.  But how will we know which schools have taken steps to become greener?  One new effort by The Solar Foundation will help to shine light on this trend.  The National Solar Schools Census  is an attempt to collect data on all of the K-12 schools that have installed solar panels throughout the nation.  The map is really cool; it uses Google Maps so you can zoom in and see the solar panels on the schools that have installed them already.  It also breaks down the schools by the size of the installation that currently exists.  While the data is understandably patchy at this time (since it can be difficult to get accurate data for all schools in a state, and because the pace of solar adoption is currently quite rapid among schools), its certainly inspiring to see all the work that K-12 schools have taken already to save money and educate their students about solar.

If your school isn't on the map, the web page has an email address so you can send the Foundation your information and be included!

Friday, August 24, 2012

A Conservative's Take on Environmental Regulation


When one thinks of environmental policy, one usually assumes that environmental policies primarily fall within the realm of the Democratic Party and left-leaning thinkers.  To an extent, this has been true recently, with Democrats sponsoring legislation to increase regulation of our air and water, including a relatively recent proposal to move to a carbon cap-and-trade system.  However, the Republican Party, usually known as the party favoring business interests, has been sensitive to environmental issues in the past (Richard Nixon created the EPA, after all), and there are parties concerned with the environment within the party that believe that some regulations are actually harmful to the environment.  Thus, by eliminating unnecessary regulations, the state of the natural world can be improved, while the republican philosophy of smaller government can be realized.  One conservative group, R Street, has published a website detailing these cuts, and the head of the firm, Eli Lehrer, shows us how eliminating regulations can be good for the environment as a whole.

Lehrer’s group’s proposal “outlines almost $700 billion in cuts that would improve the environment.”  His group takes the shears to all subsidies for oil companies, as well as for green energy companies, arguing that in times of large deficits, subsidies that go to companies that are already profitable doesn’t help taxpayers with the bills.  He also states that the litany of tax credits and subsidies also ends up distorting the clean energy market, and eliminating those will help the market function more smoothly.  He looks at subsidies for specific insurance programs, like those for agribusinesses and beach houses, and says that the private market can handle those duties as efficiently as the government.  Additionally, Mr. Lehrer recommends that the budget be gone over and eliminated of wasteful programs like the Essential Air Service Program.  The program enacts subsidies that “encourage the use of small, inefficient planes and don’t save significant time for travelers.”  In the end, the report proposes cuts that “include $269.78 billion from energy programs…$167.09 billion of agricultural subsidies…$212.02 billion of transportation subsidies…$101.8 billion of federal flood, crop, and nuclear insurance subsidies…[and] $24.99 billion from wasteful or environmentally damaging public lands and water projects.”

            While it may seem surprising to see these cuts proposed by a member of a party not usually associated with environmental protection as of late, Lehrer proclaims that these cuts came with the support of Taxpayers for Common Sense, and the progressive group Friends of the Earth.  While I believe that pricing pollution effects into the free market can help green tech with its competitiveness, smart regulation changes can be a good thing if properly vetted and administered.  It reminds me of a scene from Pixar’s Ratatouille, where several characters, particularly critic Anton Ego, take offense to chef Gusteau’s slogan “Anyone Can Cook.”  In the end, the point of Gusteau’s slogan was not that anyone can make good food, but rather, that good food can come from anywhere.  It seems that this can hold true with the policy arena as well:  not everyone can create good policy, but smart, pragmatic, well thought-out policy measures can come from anywhere.  

Sunday, August 12, 2012

Industrial Policy: Is It All It's Cracked Up To Be?


When it comes to discussing market incentives for green energy promotion, policymakers are blessed with a variety of different options for helping nascent industries compete with the established market.  In order to provide monetary scaffolding for companies to grow, the government has provided a combination of tax credits and subsidies for alternative energy companies, and direct stimulus to governmental departments focusing on green energy research.  The approach is known as “industrial policy,” and the idea behind this strategy is that it represents a “one-two punch” to help specific sectors compete more effectively with outside competition.  But is such an approach really beneficial for the energy sector in the long run?  One new study by the centrist Brookings Institute questions the viability of the current approach, and compares it to former methods practiced with other institutions in the past.  While agreeing that some federal funding may be appropriate, the authors instead make a case for a continued push for a carbon “cap-and-trade” system, in order to more properly capture the hidden costs of fossil fuel consumption.

            Industrial policy measures have been a staple of green energy promotion in the past.  In the 1970’s, during a time period of stagnation in America’s industrial sector, policymakers looked for solutions that would help revive manufacturing and increase its competitiveness in the face of new industrial powers in Japan and Germany.  One such school of thought postulated that the federal government could be used to push industry in specific, preordained directions through “indirect measures,” like tax credits and subsidies, and direct stimulus as well.  The idea was that these measures would shift industry into the “proper” cutting-edge technologies, and create increased American competitiveness in those sectors.  While this school of thought died out in the early 1980s as American productivity rebounded and Japan’s economy slowed down, the ideas behind industrial policy still appeal to various interest groups, particularly those with left-leaning ideologies.  Although these policy ideas are primarily associated with the industrial sector of the US economy, they have also been applied to the green energy sector as well.  Over the past 40 years or so, the industry has been the recipient of a combination of subsidies and grants, beginning with a massive effort by the Carter administration to produce synthetic fuels, and continuing off-and-on throughout subsequent decades. 

With the advent of the financial crisis of 2008, policymakers espousing industrial policy found an opportunity to promote green energy technologies within the context of a stimulus for the economy as a whole.  Advocates of this policy touted that “[the investments] will help address global warming and…promise greater ‘energy security,’ but also deliver thousands of ‘green jobs.’”  Like the Carter administration in the 1970’s, the Obama administration made a push for alternative energy development a centerpiece of its policy initiative, and authorized $32 billion in stimulus funds to go to the Department of Energy (DOE) for green energy research.  History has shown us that this approach is iffy at best in its effectiveness:  while a 2001 study by the National Academy of Sciences showed that DOE projects yielded returns of about $40 billion at a cost of $17 billion, “just three of the energy efficiency programs produced 75% of the benefits.”  Additionally, most of those developments occurred in the building efficiency sector, while most of the other initiatives in other sectors merely broke even, or suffered from cost overruns.  Given these facts, it’s easy to see that direct investment on an industrial scale can be a dicey proposition.

Many advocates of green energy industrial policy proclaim that we are in competition with other nations, like China, Germany, and Brazil, to produce effective alternative energy solutions, and that taking control of this industry’s development, and “winning” the competition, will result in increased jobs and a stronger economy.  Using this logic, initial investments to support industry growth will result in a quicker rate of technological progress and a leg up on the competition.  However, the logic isn’t as sound as one might think; the authors turn to the liberal-leaning economist Paul Krugman to debunk these claims.  According to them, “Krugman notes that, while the term ‘competitiveness’ is meaningful when applied to individual firms, it makes little sense when applied to the economic relationships among countries.”  What he means by this is that one can’t lump countries and corporations in the same boat when talking about competitive principles.  A corporation is a singular entity, and while corporations benefit from obtaining greater market share, international trade actually ends up helping countries more than it hurts them.  It’s tempting to believe that countries can gain a boost in GDP from aggrandizing the competitiveness of their industries in order to gain market share, but Krugman found that even if a strategic American trade policy could be crafted to gain a majority share in markets to maximize any monopolies enjoyed by US firms, the process would net less than a percent to U.S national income.  In contrast to industrial policy, empirical data support the idea of international trade to lower energy costs.  The authors of the study note that when other countries develop cheaper green tech, more of it will be used in the US as well, which will then minimize costs for conversion, and help the environment too.  Indeed, they cite recent anti-dumping cases levied by solar firms against firms in China as an example that dumping cheap solar panels in the US may actually help US consumers “by artificially lowering the costs of solar power,” and making it more competitive with nonrenewable energy sources.

            The final question concerning industrial policy is whether the claim that policy measures of this type can produce “thousands of green jobs” hold up in practice.  The first thing we need to take into account is the nature of this policy.  Industrial policy composed of direct stimulus tends to be “timely, targeted, and temporary.”  And in the 2009 stimulus proposed by President Obama, the money allocated to the Department of Energy and other green entities was just that:  a short-term burst of direct funds and tax cuts designed to provide demand for services when the private markets are unwilling or unable to do so.  Unfortunately, the Institute notes, this form of stimulus is at odds with the goals of most energy research.  This research is a time-consuming process, and beginning a project “require[s] detailed proposals, competitive contract selection, and negotiations over the scope of work,” unlike, say, a transportation or construction project.  Green energy research also tends to draw from a highly educated pool of labor that is less likely to be affected by downturns in the market, and therefore, causes less of a dent in unemployment than projects requiring less-skilled workers.  Thus, the authors conclude that “programs designed to promote the sustained commercialization of new technologies are seldom effectively counter-cyclical.”  Unfortunately, while green energy can provide many benefits to the environment, it is not the most efficient vehicle for promoting job creation.

Since industrial policy seems to falter on several of its selling points, what then would be a more efficient solution?  The authors come to the conclusion that “getting prices right” is the most logical first step in making green energy more attractive to commercial enterprise.  Properly factoring in the “hidden costs” of carbon production, like the harm carbon emissions pose to the environment and society, can help to level the playing field between green energy producers and more traditional energy companies.  The authors propose that a carbon cap-and-trade system be the main focus for creating a price scheme reflecting all costs of production, but also note that targeted governmental investments can provide a nice complement to private research and development.  To this effect, they note that the DOE would do well to shift its policy portfolio to focus on investments that “would have been taken by firms in the presence of an effective carbon price” until cap-and-trade can be implemented in Congress.  Therefore, the DOE should focus on “technologies with the lowest expected cost of abatement and the highest probability of market penetration,” instead of its current priorities.  In short, they recommend a focus on technologies that would provide a firm the maximum amount of profit if carbon were properly priced.  This combination of solutions, they argue, would be a more market-friendly solution and more properly set the carbon market at a level where green tech could compete.

            It’s interesting to note that the Brookings Institute is recommending a shift in government policy, rather than having the more often-heard debate on whether government should be helping the industry at all these days.  It says something about the importance of having government provide support to certain industries, even though there can still be plenty of debate about how that support should manifest itself, whether it be cap-and-trade, direct investment, or other methods.  Although throwing money willy-nilly at every possible energy solution seems inefficient, a more sensible solution for proponents of direct investment is to keep closer tabs on research projects, and instead move to support those projects that show the most return, like the three projects that accounted for 75% of the DOE’s profits.  That way, targeted direct investment can produce the maximum “bang for the buck,” and provide a nice complement to a future cap-and-trade program or a carbon tax.    Investing this way will help to pick up any slack in research that exists in the private sector, and help to ensure that green energy development won’t be consigned to the wastebasket in case of a future downturn in fossil fuel prices.

Saturday, July 14, 2012

Tech Talk, Round 2: Singapore's "Supertrees"

As you may have gathered from reading this blog, I am a fan of the multitude of steps that Singapore has undertaken to decrease its climate footprint in order to combat man-made climate change.  The country is among the world's leaders in creating policies that further the adoption of energy-efficient technologies and strategies to reduce its carbon emissions.  And the country has also been one of the most innovative in coming up with unique solutions to combat climate change.  One such undertaking really showcases a way where climate mitigation can be as beautiful as it is practical.

The finishing touches are being applied to Singapore's Gardens By the Bay exhibit, which is set to open by the end of the month.  Source:  CNN.com
Singapore's National Parks Board (NParks) is set to open a new exhibit this month, Gardens by the Bay, which will showcase flora and fauna from around the world and create an "urban oasis" within Singapore's city limits.  The main attraction consists of two conservatories, the Cloud Forest and Flower Dome, that will end up displaying over 200,000 plants from the rest of the world's ecosystems.  The designers, however, chose to integrate the biospheres' support systems into the attraction as well, by designing a grove of "trees" to act as collectors of energy.  The "trees" are designed to generate solar power by collecting energy through photovoltaic cells in their canopies, which will then be used to run the technology in the conservatories themselves.  The trees will collect rainwater, and also serve as vertical ventilation shafts for the conservatories.  According to CNN, "the large canopies also operate as temperature moderators, absorbing and dispersing heat, as well as providing shelter from the hot temperatures of Singapore's climate to visitors walking beneath."  NParks is also building skywalks to integrate the "trees" with the rest of the exhibit, and provide visitors with a bird's-eye view of the greenhouses.  
The Cloud Forest conservatory is one of two main display areas for the world's flora and fauna in Singapore.  Source:  CNN.com
This "urban oasis" will not only help reduce Singapore's urban heat-island effect by absorbing sunlight within its natural canopies, but will provide entertainment for its citizens too.  Already, NParks is working on building in bike paths and hiking trails so that visitors can explore the rest of the gardens in the area,  and the addition of marina boardwalks will help visitors to take advantage of the natural beauty of Dragonfly and Kingfisher Lakes, and relax by the water.  The park is a practical and gorgeous example of how climate mitigation strategies can be entertaining to the eye, and beneficial for the planet, too.
Bike trails and boardwalks invite visitors to explore the entirety of Singapore's Gardens by the Bay. Source:  CNN.com


Tuesday, July 3, 2012

Tech Talk: The Advent of the Wind Lens

One of the most exciting aspects of green energy production is that, because it is a nascent industry, technological advances can occur at a relatively rapid pace.  One such advance, made possible by scientists at the University of Kyushu, could end up helping wind power take flight.

Computer simulation of proposed wind farm off the coast of Kyushu, Japan.  Source: http://polizeros.com/2010/08/02/wind-lens-turbines-could-triple-energy-output/ 

The "wind lens" is actually a series of modifications to the traditional wind turbine that help to increase airflow through the blades of the turbine, and subsequently, increase total power output.  The design works by encasing the blades themselves in an outer shell.  The shell is designed to create small vortices on the leeward side of the lens.  These vortices then create an area of low pressure where the wind exits the turbine (Fig 1).  Because pressures are lower where the wind exits the turbine, more air must move in to fill that area and attempt to achieve equilibrium; this effect causes wind speeds to increase in front of the blades and force more wind through the turbine.

Fig 1: Diagram of wind lens creation of low pressure system.  Source:  Kyushu University RIAM Wind Engineering Section Homepage. http://www.riam.kyushu-u.ac.jp/windeng/en_aboutus_detail04_02.html

The effects of this phenomenon, the researchers found, was to increase wind power by up to a factor of three from the "traditional" turbine design.  Thus, by upgrading wind turbines to wind lenses, existing wind farms could produce up to three times as much power, and energy needs could be satisfied with 1/3 of the space (Fig 2).  Now, due to additional materials usage, and the additional personnel required to retrofit existing structures and construct new fields, the initial startup costs for wind lens technology will be higher than that of traditional designs, but the long-term power advantages will be huge.  With wind lenses deployed in enough locations, the United States could see nearly 90% of its current energy usage accounted for by these wind farms.  Additionally, the wind lens is reported to be quieter than current windmills, and can be created in differing sizes to take advantage of microclimatic conditions in cities or countrysides.  

Fig. 2:  Comparision of results for wind generation between "conventional" turbines and wind lens technology.  Source:  Kyushu University RIAM Wind Engineering Section Homepage.  http://cleantechnica.com/2011/09/02/wind-lens-triples-turbine-output/

It's heartening to know that advances in green tech are rapidly closing the "cost gap"  between nonrenewable sources of energy and renewable, clean alternatives.  As costs fall, companies will be more inclined to pursue these sources to power their operations, since the social benefits combined with lower costs will be a boon for them both on their balance sheets, and in their public images.  Hopefully, proper subsidies and grants will be forthcoming for this technology in the coming few years, so that construction will be initiated in a timely manner, and the transformation of the world to a clean energy society can continue.

Monday, June 4, 2012

Pragmatism at Work: Singapore's Approach to Addressing Climate Change (Part 2)

This week, we'll examine some of the competency-building strategies that Singapore is utilizing to improve the awareness of its population towards minimizing climate change.  As awareness of energy-saving and green technologies increases, all parties will be able to tailor their decisions with the environment in mind.  To hasten its change towards a more carbon-neutral society, Singapore is working to build up its competencies towards energy efficient technologies, with an emphasis on research and development being pursued simultaneously between the government and the private sector.  One technology that holds significant promise for meeting Singapore’s energy needs going forward is solar cell development.  Due to its abundant sunshine hours from its location in the tropics, Singapore is positioned to reap many advantages from improved solar cell efficiency.  To explore this technology and its applications, the government and Singaporean universities are doing research into new solar cell technologies.  This, in conjunction with similar projects to produce more cost-effective fuel cells and wind turbines, will intensify Singapore’s commitment to green growth in its domestic markets.

One of the most innovative programs that the Singaporean government is currently implementing is the Certified Energy Manager (SCEM) program.  This program aims to “help equip facility owners and technical staff with the necessary knowledge and skills to manage energy services within their facilities (24).”  The idea behind this is that professional staff with more education on energy-efficient options for their businesses will be more willing and likely to pursue those options as part of a long-term cost-cutting strategy, and speed the conversion to more environmentally friendly methods of commerce and industry in the process.  This program is the first of its kind in Southeast Asia, and will act as a pilot program for other countries in the region.  Hopefully, the skills managers acquire through the training program will be disseminated throughout the companies they represent, increasing awareness.

Singapore has also taken steps to improve the competency of households in adapting to green, energy efficient technologies.  The government has imposed Minimum Energy Performance Standards on household air-conditioners and refrigerators and also mandated that energy labels be placed on different models to inform consumers of the relative efficiency of different appliance brands.  The government is also looking into the feasibility of producing an “energy vending scheme” to allow households to purchase energy from any electricity vendor and to monitor energy usage at home.  Providing households with maximum choice in the market is a way to increase competition between energy vendors, thus keeping costs low as vendors compete for market share.  The system will also increase awareness of energy consumption habits by households.  This awareness, combined with a National Environment Agency (NEA) program to educate the populace via website and mailings on simple energy-saving habits, will help to make households more energy-efficient, and even save them some money on their energy bills. 

Finally, Singapore has taken steps to integrate its domestic policies with those of the larger international community.  The country is a signatory of the Kyoto Protocol, and is working to grow its carbon services sector to join carbon exchanges networks in Asia and Oceania.  To increase international awareness and interest in these exchanges, Singapore has positioned itself as a hub for education and finance in Asia.  The country has organized carbon seminars, meetings, and other activities to spread awareness of carbon trading to other Asian nations.  One such event, Carbon Forum Asia 2007, drew “1000 participants from 46 countries (37)”, and is symbolic of Singapore’s push to become a model carbon-trading country for other states to emulate. In addition to its emphasis on international forums and workshops, Singapore was chosen as a base for the Renewable Energy Exchange Capital Asia to bring together investors and entrepreneurs alike for funding of green projects.  This speaks highly of Singapore’s ability to achieve its goals in the international arena, as well as domestically.

Perhaps the most striking thing that jumps out while examining Singapore’s blueprint for mitigating climate change is how much it reads like a corporate brief.  The government comes across as intensely pragmatic:  both market incentives and governmental programs are considered and chosen as solutions, with the overriding goal being the maximization of policy effectiveness.  It is a focus on what works, without regard to ideology or bias.  And this focus manifests itself not only in the environmental arena, but throughout different areas of the market as well.  It is this fundamental mindset that has produced policies that have brought Singapore to first-world status, and this continued push for sensible, productive solutions will serve the country appropriately as it transitions to a more environmentally-friendly, energy efficient society.  To be sure, Singapore’s governmental situation is rather unique; while it is a parliamentary democracy, the People’s Action Party has been in control of the government for decades, which allows it to have the luxury to plan with the long-term in mind.   But an absence of this situation in other countries does not have to preclude the development of smart, pragmatic policies that can help further economic growth while simultaneously reducing mankind’s impacts on the environment.  If properly implemented and reviewed, sound policy measures can end up as a “win-win” situation for both the economies and the environments of countries.  Hopefully, Singapore’s efficiency and emissions-reductions strategies will serve as a model for the rest of the world to adapt and implement to create a more carbon-neutral and environmentally-friendly planet.