In this module, the following topics are covered: 1) the considerations needed to make a move to a sustainable energy economy, 2) the path to get to a sustainable energy economy, 3) sustainable energy policies and climate action planning.
After reading this module, students should be able to
- understand the considerations needed to make a move to a sustainable energy economy
- describe a path to get to a sustainable energy economy
- connect sustainable energy policies to climate action planning
Traditionally, the United States has relied on fossil fuels with minimal use of alternatives to provide power. The resources appeared to be unlimited and they were found within our borders. As our population has grown and our reliance on power increased, our resources are decreasing. As discussed in Module Environmental Challenges in Energy, Carbon Dioxide, Air and Water, this is particularly true of petroleum oil, which primarily powers transportation. Our electrical grid and transportation infrastructure of roads and highways support these fossil fuel dependent technologies. Fossil fuels store energy well, are available upon demand (not weather dependent), and are inexpensive. However, as we saw in Module Environmental Challenges in Energy, Carbon Dioxide, Air and Water there are many environmental, social, and even economic impacts of using these nonrenewable fuel sources that are not accounted for in the traditional methods of cost accounting. Further, the oil industry has been provided with many subsidies or tax incentives not available to other energy industries.
How do we move to a more sustainable energy economy? We need to pay more attention to the environment, humans, biodiversity, and respecting our ecosystems. It means finding ways to share our resources equitably both now and in the future so all people can have an equal opportunity to derive benefits from electricity, motorized transportation systems, industry, and conditioned indoor environments. At the same time, we must preserve human health and protect the natural world.
Energy use is one big piece of the sustainability puzzle, but it is not the only one. Changing the way we use energy is not easy because of infrastructure, the vision of the American Dream (own a house with a big yard, a big car, independence), changing government policy, lack of economic incentives, etc. Goals need to be set, plans made, and policy set to change the way we use energy. This chapter will discuss some of the commonly held views of where we can start and how we can change.
Climate Action Planning as a Model
Since one of the major sustainability issues is that of climate change and the major cause of climate change is energy use, climate action planning is a valuable framework for examining sustainable energy practices. Greenhouse gas emissions result primarily from our building and transportation energy uses, and they are a measure of the amount of fossil fuels used to provide that energy. They do not directly represent other environmental emissions, although they mostly parallel other air pollutants. Greenhouse gas emissions do not express other ecosystem effects such as land use and water, but this planning allows for economical solutions. A climate action plan provides a roadmap for achieving greenhouse gas reduction targets within a specific timeline and uses a number of strategies.
Who is Doing Climate Action Planning?
In absence of federal regulation, cities, states, government institutions, and colleges and universities, have all taken climate action initiatives. In Massachusetts entities that generate more than 5,000 metric tons per year of Carbon Dioxide Equivalent (CO2e) began in 2010 with 2009 emissions. The U.S. Environmental Protection Agency (EPA) requires facilities that emit more than 25,000 metric tons CO2e per year to start reporting in 2011 for 2010. Many cities have developed Climate Action Plans that set greenhouse gas reduction goals and lay out pathways to achieve them. Chicago launched its plan in 2008 and reports annually on its progress. President Obama signed White House Executive Order 13514, in October 2009 requiring all federal agencies to appoint a sustainability director, take inventory of greenhouse gas emissions, and work to meet sustainability targets. Over 670 American colleges and universities have signed the American College and University Presidents’ Climate Commitment (ACUPCC) that requires them to develop climate action plans. Private industries also develop climate action plans.
The National Wildlife Federation suggests that there are six steps to reduce carbon emissions at universities – this could be similar for any other entity:
- Commitment to emissions reduction
- Institutional structures and support
- Emissions inventory
- Developing the plan
- Launching the plan
- Climate action planning over the long haul
Based on the climate change scenarios calculated by the Intergovernmental Panel on Climate Change, it is recommended to reduce greenhouse gas emissions to 80 percent below the 1990 levels, whether or not there is continued growth. This is an absolute reduction to prevent greenhouse gases from reaching levels that will have severe effects. A climate action plan is made of a number of strategies to achieve that goal. To examine the impact of each strategy the wedge approach is used. Developed by two professors at Princeton, Socolow and Pacala, the approach proposes that in order to reach those levels, emissions must be decreased globally by seven gigatons of carbon (not carbon dioxide) compared to “business as usual” (BAU) scenarios which would increase emissions over time due to growth and increased demand for energy (Figure The Wedge Approach (a). These professors identified 15 proposed actions that could each reduce emissions by 1 gigaton, and if we could enact seven of them we would achieve the goal (Figure The Wedge Approach (b). Each of those technologies is represented by a “wedge” of the triangle, hence the designation of the “wedge approach.”
All of the proposed solutions in Sokolov and Pacala’s proposal are existing technologies. However, for a solution to be sustainable it must be economically viable. Another aspect of developing a plan is the cost of the solutions. Figure Global GHG Abatement Cost Curve Beyond Business-As-Usual – 2030 shows the amount of greenhouse gas emissions that can be abated beyond “business as usual” in 2030, along with the costs of different abatement strategies. Those technologies that fall below the 0 line will actually have a negative cost or positive economic benefit. Those technologies that rise above the 0 line will have positive cost associated with them which could be offset by the technologies that fall below the line.
The types of technologies that fall below the line are primarily energy conservation and efficiency technologies. Energy conservation is the act of reducing energy use to avoid waste, save money, and reduce the environmental impact. In the framework of sustainable energy planning it allows the more expensive alternatives, such as renewables, to become more advanced and cost-effective, while we conserve as much as possible. Conservation has a behavioral aspect to it, such as turning off lights when not needed, lowering thermostats in the winter, or keeping the proper air pressure in a vehicle’s tires. There is a very low cost to conservation but it entails behavioral change. There are technologies such as motion detectors that can control lights or programmable thermostats that adjust temperature that can help overcome the behavioral barrier. Energy efficiency can be seen as a subset of conservation as it is really about using technological advancements to make more efficient energy-consuming equipment.
In the United States we use twice as much energy per dollar of GDP as most other industrialized nations (see Figure Energy Demand and GDP Per Capita (1980-2004)). There are many reasons for this. One reason is that we use less efficient vehicles and use proportionally more energy to heat and cool buildings, behaviors that could be modified to be more efficient.
Another reason that the United States uses so much more energy than other industrialized countries has to do with heating, cooling, and illuminating buildings. Buildings account for about 40 percent of total energy consumption in the United States (costing $350 billion per year) and greenhouse gas emissions (see Figure U.S. Energy Consumption by Source). Energy use in buildings is primarily for heating, cooling, and illumination, with significant differences between commercial and residential buildings. The rest of the energy use is for equipment such as office equipment, electronics, refrigeration, cooking, and washing. There are many ways to save energy in existing buildings and most of them have a good financial benefit of saving money on the energy costs, i.e. they have a short term financial payback, or return on investment (ROI).
Start with the Lights
The most prevalent message in energy efficiency is “change the light bulbs.” Replacing traditional incandescent light bulbs with compact fluorescent light bulbs can save energy. The light bulb had not evolved much since Thomas Edison perfected it in 1879. Over the last few years there have been major initiatives across the United States to replace inefficient incandescent light bulbs with compact fluorescent light bulbs (CFLs) that can reduce energy use by 75 percent. The light bulbs also last 10 times as long, reducing waste and maintenance costs. In commercial buildings more efficient fluorescent light bulbs (T-8s) and ballasts are replacing the older T-12s. In 2002, the U.S. Department of Energy required that T-12 ballasts no longer be manufactured, ending a five year phase out of this technology.
Already newer, more efficient technologies are hitting the market – light-emitting diodes (LEDs) – which use less than 25 percent of the energy of an incandescent light and last at least 15 times longer, if it has the ENERGY STAR rating. ENERGY STAR is the government-backed symbol for energy efficiency recognition. LEDs are small light sources that become illuminated by the movement of electrons through a semiconductor material (Figure Solid State Lighting (SSL)). The technology is still evolving and not all LED lights are created equally. LEDs are more expensive and will have a longer pay back time, but they also last longer.
If CFLs were used in all homes, the most advanced linear fluorescent lights in office buildings, commercial outlets and factories, and LEDs in traffic lights would reduce the percentage of electricity used for lighting in the world from 19 percent to sever percent. That’s equivalent to 705 coal-fired power plants.
Buy More Efficient Equipment and Appliances
ENERGY STAR also ranks equipment for efficiency from refrigerators to air conditioners to computers and televisions. Policies and financial incentives encourage people to buy more energy efficient products which tend to be more expensive. However, by saving on energy costs consumers can recuperate the investment. Refrigeration makes up 9 percent of household energy use. Refrigerators have gotten more efficient from 3.84 cubic feet per kilowatt hour per day in 1972 to 11.22 cubic feet per kilowatt hour by 1996 (Figure Average Efficiency of New Refrigerators in the United States (1972-1997)). The efficiency of an average new refrigerator has increased dramatically. New technology, increasing price of electricity, and anticipated energy efficiency standards contributed to increased efficiency in new refrigerators. The National Appliance Energy Conservation Act of 1987 set minimum efficiency standards for 13 product types, including refrigerators. After 1993, no refrigerator could be sold that did not meet the standards. Standards were updated again in 2002. However, 3 percent more households had two or more refrigerators in 2001 compared to 1980, partially reducing the effect of increased efficiency, especially since the second refrigerator tends to be less efficient.
Today, consideration should be given to electronics in purchasing. Laptops, for instance use considerably less electricity than desktops and flat screens less than the old cathode ray tube (CRT) monitors. New HD televisions use more energy than older analog TVs. Also, there are many appliances that even if turned off, draw power from the grid. This is sometimes called phantom load or vampire power. Although it is a small amount, it can comprise up to 10 percent of home electricity use. Chargers for cell phones, digital cameras, computers, and power tools are very common sources of phantom load. Also, TVs, computer monitors, and DVD players have current whenever they are plugged in. Using a “smart” power strip can eliminate the need to manually up-plug. Plugging everything in to a strip that is control by one master device or activated by a motion detector provides the technology to replace the behavior of manually turning off and unplugging all the devices when they are not in use.
Tighten Up the Building Envelope
The building envelope (e.g. walls, windows, foundations, doors, and roofs) greatly affects how efficient a building will be in maintaining comfortable interior temperatures. Insulation in walls and seals around windows and doors are prime factors. Low-emittance coatings (microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface primarily to reduce the U-factor by suppressing radioactive heat flow), gas-fills, and insulating spacers and frames can significantly reduce winter heat loss and summer heat gain through windows.
Double-pane, insulated glass windows significantly reduce the load on the heating and cooling systems and drafts, which in turn, reduces energy demand. These projects are most financially beneficial when leveraged as part of other renovation projects. Existing windows can also be “fixed” with weather-stripping and caulking to seal them from air leakages. Good storm windows over single-pane glass windows can also provide similar insulation to double-pane without the need for the larger financial investment and the creation of waste that replacement entails.
Insulation in the attic or roof of a building and at the “seam” of the building between the basement and first floor, as well as the walls can be installed or increased to retain the heated or cooled air for building or home. Related to insulation is sealing of opening to prevent air from leaking out (see Figure Diagram of a Leaky Home).
Maintain or Upgrade Heating, Ventilation and Air-Conditioning Systems
Heating, ventilation, and air-conditioning systems in commercial and industrial buildings need to be properly monitored and maintained for the most efficient function. This is often not done well after a system is installed because not enough resources are dedicated to maintenance of systems. Processes related to building commissioning make sure that buildings are ready for service after equipment installation and testing, problems are identified and corrected, and the maintenance staff is extensively trained. If this was not done or the effect has worn out, buildings may undergo recommissioning, or if it was never commissioned, retrocommissioning can be performed.
If equipment such as motors, fans, boilers, and chillers are too old to fix or inefficient, they can be replaced or retrofitted with more energy efficient equipment. Building automation systems (BAS) use electronic technology to control and monitor building systems. They can schedule temperature settings and ventilation needs based on actual or scheduled occupancy so energy can be saved when space is unoccupied. In homes, this is typically done with a programmable thermostat that can set the temperature points to conserve energy during the day when a home is unoccupied and then go back to occupancy settings when the family returns.
Energy consulting companies can provide many services and innovative solutions for building owners that will reduce energy costs. This is a growing job sector within the United States economy as businesses try to capitalize on the savings that energy projects like those described above can provide.
Combining Heat and Power
One area of huge potential for energy efficiency is from capturing waste heat from electricity generation and many industries through a process called cogeneration or combined heat and power (CHP), which is discussed in greater detail in the Module Combined Heat and Power. Cogeneration is the simultaneous production of heat and electrical power in a single thermodynamic process. Instead of discarding the heat produced by the electrical power production or industrial process, it is captured and used to provide space heating and hot water heating, humidification, cooling (via absorption chillers), as well as other uses, thus eliminating the added expense of burning fuels for the sole purpose of space heating (see Figure Comparison of Energy Efficiency of Standard Power Plant and Combined Heat and Power Plant). The U.S. Department of Energy calculated that CHP generation from industrial processes alone is equal to the output of 40 percent of coal-fired generating plants that produced electricity in 2007.
Design New Buildings to Reduce Energy Use
The construction of new buildings consumes a lot of energy from the production of the raw materials, the transportation to the building site, the construction process, and ultimately the energy used to operate the building. In the last decade in the United States, there has been a growing recognition that much could be done to reduce the environmental impact of new construction. Therefore, building energy codes increasingly demand higher energy efficiency and green building certification and recognition systems have been developed, such as Green Globes and Leadership in Energy and Environmental Design (LEED), to promote design for the environment. Aspects of construction that can enhance energy efficiency include site selection, energy and water efficiency, materials used, proximity to public transit and provision of biking amenities, and renewable energy. In addition, using a process of integrated design where the structure of the building itself provides the energy needed to heat, cool or illuminate the building, energy savings can be achieved more readily.
Implementing Renewable Energy Technologies
When buildings have been retrofitted to be more energy efficient and combined heat and power systems are used more broadly, we will have reduced energy demand significantly and cost effectively, while creating more jobs domestically. We can then look at the mass deployment of renewable energy technologies. Over time these technologies will mature and become more affordable. This process can be enhanced through policy implementation that incentivizes renewable energy development.
The electric grid will need to be expanded. This will allow for more interstate transmission of renewable electricity from the areas where the resources are good such as the southwest, for solar, and the central and plains states, for wind, to the areas where the population centers are such as the east and west coasts. If these grids are smart and allow for real-time energy pricing then demand will be leveled out. This unified national smart grid would include more efficient, higher-voltage long-distance transmission lines; “smart” distribution networks that use the internet to connect smart meters in homes and along the grid; energy storage units (i.e. batteries) throughout the network; and two-way communication between the equipment that consumes electricity and the equipment that produces it.
We can envision a future where most cars on the road are electric. At night, consumption across the grid is lower because lights are off, buildings are closed, and less manufacturing occurs. Owners of electric cars will plug their cars into the grid at night and recharge them after being driven during the day. Since, demand for electricity is lower, prices for this utility will be lower. With smart meters, residents will be charged for the actual cost of electricity at time of use rather than an average price. They will be incentivized to set washing machines and dishwashers to run at night when electricity demand is lowest. All of this evens out the demand on the grid, which means that power plants do not need to operate at peak capacity and reduces the need for new plants.
Energy Savings in Transportation
Transportation comprises nearly a third of energy demand in the United States so energy savings achieved here will translate to overall energy savings.To reduce energy consumption by vehicles we need to encourage vehicle efficiency and conservation. This is accomplished through the Corporate Average Fuel Economy (CAFÉ) standards. Congress first enacted these standards in 1975 due to the rising cost of gas that resulted from the country’s dependence on increasing levels of petroleum imports. The National Highway Traffic Safety Administration sets fuel economy standards for cars and light trucks sold in the United States while the EPA calculates the average fuel economy for each manufacturer. In addition to CAFÉ standards, in 1975 the speed limit on United States highways was reduced to 55 mph to limit gas consumption. Figure Carbon Dioxide Emissions and Fuel Economy by Model Year shows that model year 2009 had the lowest CO2 emission rate (397 g/mi) and highest fuel economy (22.4 mpg) since tracking began in 1975.
Other ways to increase efficiency can be found through innovative alternative vehicle technologies, improved internal combustion engines, exhaust gas recycling, variable valve timing, vehicle downsizing, lightweighting, and behavior. Government policies need to make the cost of driving evident through full amortization, fuel/road tax, and insurance costs.
Another tactic to reduce fuel consumption is increasing the use of transportation alternatives. The use of active transportation will cause a change from environmentally harmful, passive travel to clean, active travel by bicycle, foot, and public transit. Convenient and safe public transit is not available in all communities, as it requires a certain population density to be viable. Moreover, since Americans often associate the car they drive with their material success and our communities are spread out, many people do not view public transportation favorably. Most metropolitan areas have some kind of transit system to provide transportation to those who cannot afford cars or cannot drive and/or to relieve traffic congestion. Historically, the United States has not invested equally in road and public transportation infrastructure meaning that often it is slower and more complicated to travel by transit. However, transit use is generally more economical than owning and driving a car. The American Public Transportation Association has calculated the savings based on a two person-two car household going to one-car. They found that riding public transportation saves individuals, on average $9,656 annually, and up to $805 per month based on the January 5, 2011 average national gas price ($3.08 per gallon-reported by AAA) and the national unreserved monthly parking rate. Savings for specific cities are shown here.
Bicycling and walking are two forms of alternate transit that have no environmental impact on energy demand. Many local governments are devoting resources to adding bike routes and parking facilities to encourage bicycling as a mode of transportation. Sidewalks and safe cross-walks are prerequisites for safe walking.
There are some options for those who must drive to reduce their energy use. Carpooling and car sharing are also options that lower the number of cars on the road, while providing opportunities to travel by car when needed. Improved social network-based car-pooling programs can help to match riders with drivers in a dynamic way. Car sharing is a decentralized, hourly car rental system that allows people who do not own cars, but occasionally need one, to access a vehicle in proximity to their workplace or home.
There is no one silver bullet when it comes to solving the “energy problem” or planning for climate action. There are many viable solutions and the problem is so large that multiple pathways must be forged. The primary challenge is to use energy more efficiently so little goes to waste. From small actions like changing a light bulb, to large projects like CHP, the potential is great and the financial payback rewarding. Increased vehicle efficiency and active transportation are also strategies for reducing energy use. Both within the building sector and the transportation sector we have the greatest challenges to and potential for changing how we use energy today. We have already started to make that transition from more stringent CAFÉ standards to more green buildings. The challenge is to upscale all the strategies to make a significant impact.
What does the chart in Figure Energy Demand and GDP Per Capita (1980-2004) tell us about developing countries such as China, India and Brazil’s energy use? a) In comparison to developed countries. b) Over time.
Briefly describe a path to reducing our dependency on fossil fuels for transportation energy consumption.
Why is energy efficiency considered a sustainable energy choice?
Brown, L.R. (2008). Plan B 3.0: Mobilizing to save civilization. New York: Earth Policy Institute.
City of Chicago. (2011). Chicago Climate Action Plan. Retrieved September 12, 2011 from http://www.chicagoclimateaction.org/filebin/pdf/finalreport/CCAPREPORTFINALv2.pdf
Eagan, D.J., Calhoun, T., Schott, J. & Dayananda, P. (2008). Guide to climate action planning: Pathways to a low-carbon campus. National Wildlife Federation: Campus Ecology. Retrieved September 12, 2011 from http://www.nwf.org/Global-Warming/Campus-Solutions/Resources/Reports/Guide-to-Climate-Action-Planning.aspx
Gore, A. (2009). Our choice: A plan to solve the climate crisis. New York: Melcher Media.
Pacala, S. & Socolow, R. (2004). Stabilization wedges: Solving the climate problem for the next 50 years with current technologies. Science, 305, 968-972.
University of Illinois at Chicago. (2009). UIC Climate Action Plan. Retrieved September 12, 2011 from http://www.uic.edu/sustainability/climateactionplan/.
- Active Transportation
- Means of transportation that involve more physical activity, typically considered walking, biking, and use of public transit (bus and rail).
- Building Automation System (BAS)
- Controls and monitors a buildings mechanical and lighting systems through a computerized, intelligent network [http://en.wikipedia.org/wiki/Computer_networking] of electronic devices.
- When two or more people travel to and from proximal departure and arrival destinations in the same vehicle.
- Car Sharing
- A program that allows for more than one person to have use of a car. Generally, it works like a short-term (hourly) car rental service. Cars are located near residences and work places to facilitate the access to the vehicles and to reduce the need for individual car ownership.
- Making a product out of materials that weigh less than were previously used
- Low-Emittance Coatings
- Microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface primarily to reduce the U-factor by suppressing radioactive heat flow.
- Phantom Load or Vampire Power
- Refers to the electrical load of appliances and chargers when they are not in use but plugged in, as they still draw power but provide no service.
- The rate of heat loss is indicated in terms of the of a window assembly. The lower the U-factor, the greater a window’s resistance to heat flow and the better its insulating properties.
- Wedge Approach
- A way of expressing the concept that there is no one solution to the challenge of reducing greenhouse gas emissions. Each technology, action or change is represented by a triangular wedge in a chart of time vs. emissions.