By now, you’ve probably heard about the promising potential “plug-in” hybrid cars can provide, both in terms of combating the global warming crisis and also relieving America’s dependence on foreign oil. By many of today’s giant auto makers, plug-in hybrids are marketed as being the car of the near future.
A plug-in hybrid, as opposed to a regular gasoline-electric hybrid car, is able to recharge its electric motor’s batteries simply by being plugged into a domestic power outlet when not in use. This gives it the distinct advantage of not having to always use its gasoline engine as a generator, as regular hybrids do. The charge stored in the car’s batteries powers its large electric motor, which single handedly propels the vehicle. Where as a traditional hybrid vehicle needs to use its internal combustion engine for at least part of a commute or in some cases whenever moving, a plug-in stores a sufficient enough charge to allow it to operate for up to forty miles without ever using its gas engine. A forty mile ‘all electric’ range is estimated to meet the every day demands of over 75% of the nation’s commuters.
Already, GM has showcased their highly anticipated plug-in “Volt” at auto shows; it’s a 4-door 4-seater to be released under the Chevy name. Last June GM Chief Executive Rick Wagoner told reporters that “The Chevy Volt is a go,” making this unexpected statement ahead of the company’s annual meeting with shareholders in Wilmington, Delaware- production is slated for the end of 2010. The Volt will have a 120 kW (160 hp) electric motor powering the front wheels. In addition, it will contain a small 1.4 liter engine whose purpose is not to power the wheels but to recharge the battery during extended commutes. During a normal commute, however, the car will have no need for the gasoline engine/generator making it a truly “zero emission” vehicle.
Plug-in hybrids are propelled using their elaborate electric drive system, which is recharged by drawing from the electric grid which it is plugged into every night. The Volt’s batteries store about 9 kilowatt hours (kWh) of energy. With electricity costing about a dime per kilowatt, this means that its battery would currently cost under a dollar to completely charge (or 2.5 cents per mile). Compare this to the national gasoline average of $2 per gallon in 25 mpg gas-driven vehicles, and you’ll achieve an 8 cent per mile driver’s average. Clearly, the plug-in hybrid wins in cost effectiveness.
Zero emission plug-in hybrids like the Volt appear to be a step in the right direction. They’re very marketable; we are lead to believe that they could be one large leap for mankind’s battle against a warming globe. This just leaves us with one simple question. Where is the electricity that powers this future fleet of “clean cars” actually coming from- the national electric grid? Sounds innocent enough. Well, in 2008 gas and petroleum power plants generated about 26 percent of America’s electricity, a source which is both dirty and creates foreign dependence. Coal, which gives us almost half of our power, is perhaps the dirtiest of all power sources making it one of the biggest contributors to global warming. If we were to hypothetically lose all of our gas driven vehicles, replacing them with “clean” electric cars, what we’re in essence doing is moving power consumption from the individual driver to the consolidated power plant source. This would of course place a catastrophic amount of dependence on our power plants- including the dirty coal powered power plants. Think of it this way- every time a person driving an electric car steps on the “gas” as the traffic light in front of them turns green, just imagine a billow of black smoke simultaneously emerging from the chimney at their nearest coal power plant. The environmental impact of a coal driven fleet of electric cars would be far greater than today’s cars which individually burn gasoline.
If the country is serious about making the move to driving vehicles which use electricity instead of gas, we’ll need to reconsider where we are getting this electricity from. Simply changing how we drive might slightly lessen the demand for foreign oil, but it won’t curb the country’s overall level of pollution. In fact, if given the chance, drivers who are not visiting the pumps on a daily basis might even forget about the perils of a primarily coal-driven transportation system.
We have many options for renewable energy- wind, solar, hydro, geothermal- but as of yet all these sources only constitute a combined 10% of the country’s energy production. But we cannot forget the nearly forgotten energy ‘panacea’ from over fifty ears ago: nuclear energy. Today, nuclear only accounts for fewer than 20 percent of our energy. Unfortunately mass media continues to skew public opinion of the extremely efficient power supply. Chernobyl, the most well known nuclear accident, was caused by an outdated model, poor infrastructure, maintenance, and lack of containment shells to protect against meltdown. All modern US reactors are currently equipped with are far superior components and use a plethora of built-in sensors designed to shut down the plant immediately in the event of trouble. In France, 77% of electricity comes from nuclear. Consequently, France is rated 24th of 29 industrialized nations in its C02 emissions per capita. According to the website of the WNA, the total fuel costs of a nuclear power plant [are] typically about a third of those for a coal-fired plant and between a quarter and a fifth of those for a gas combined-cycle plant.
Many innovative solutions arise every day in an attempt to get our cars off gas (and the electric grid). In Westbury, New York, at the New York Institute of Technology, graduate students have commenced work on ’solar carports,’ which when active will supply electricity to plug-in cars. These parking spots, roofed over by photovoltaic (PV) cells, will allow intercampus plug-in vehicles to effectively draw their power from the sun, cutting off any ties to the electric grid or gas pumps.
Other like-minded ideas exist: Electrolytic cells, which are the devices used to extract hydrogen from water, can be powered by photovoltaic cells. Current prototypical vehicles, such as the Honda FCX Clarity, are powered by a system of hydrogen fuel cells which in turn drive an electric motor. The Claritys, of which 200 were released as a pilot program in Southern California, are refueled using compressed hydrogen gas found at a limited number of gas stations in the said pilot area. The initial process of isolating hydrogen from water does use energy, so the prospect of constructing solar powered hydrogen-generating fuel stations would be a green move all across the board. It would, however, increase demand for fresh water.
At the current state of our energy production infrastructure, moving the country to electric cars is just putting a new face on an old problem- dirty energy. The recent success in marketing of personal electric transportation has set an eerie example of how easily an uninformed population can be blinded of true ‘cradle to grave’ costs. Americans need to remember to always ask the important questions to car manufacturers, whose product contributes 14% the world’s greenhouse gasses. If we’re being pitched new plug-in electric cars, ask ‘where’s the electricity ultimately coming from?”. If it’s hydrogen fuel cells, ask how the hydrogen is being made and where the energy required to make it is coming from. As any physics student will learn, energy does not just appear (nor disappear). As American’s who care about the fruition of our future generations, it is necessary to act promptly to make sure the next technological revolution is truly a green technological revolution.

