With the price of oil above $50 a barrel, with political instability in the Middle East on the rise and with little slack in the world oil economy, we need a new energy strategy. Fortunately, the outline of a new strategy is emerging with two new technologies.
These technologies – gas-electric hybrid engines and advanced-design wind turbines – offer a way to wean ourselves from imported oil. If over the next decade we switch to gas-electric hybrids with the efficiency of today’s Toyota Prius, we could cut our gasoline use in half. No change in the number of vehicles, no change in miles driven – just doing it more efficiently.
The Prius, a car on the cutting edge of automotive technology, gets an astounding 55 miles to the gallon. It is one of three gas-electric hybrid car models on the market and several more are on the way. In addition, General Motors has delivered 235 hybrid-powered buses to Seattle with the potential to reduce gasoline use there by up to 60 percent, and three other American cities are slated to get hybrid buses.
Hybrid engines are catching on. The stage is set for the second step to reduce oil dependence: the use of wind-generated electricity to power automobiles.
If we add to the gas-electric hybrid a plug-in capacity and a second battery to increase its electricity storage capacity, motorists could then do their commuting, shopping and other short-distance travel largely with electricity, saving gasoline for the occasional long trip.
This could lop another 20 percent off gasoline use in addition to the initial 50 percent cut from shifting to gas-electric hybrids, for a total reduction in gasoline use of 70 percent.
The plug-in capacity gives access to vast, largely untapped, wind resources. In 1991, the U.S. Department of Energy published a National Wind Resource Inventory in which it pointed out that three of the 50 states – Kansas, North Dakota and Texas – have enough harnessable wind energy to satisfy national electricity needs. Many were astonished by this news since wind power was widely considered a marginal energy source.
We know that even this was a gross underestimate because it was based on the wind turbine technologies of 1991. Advances in design since then enable turbines to operate at lower wind speeds, to convert wind into electricity more efficiently, and to harness a much larger wind regime.
The average turbine in 1991 was roughly 120 feet tall, whereas new ones are 300 feet tall – the height of a 30-story building. Not only does this more than double the harvestable wind regime, but winds at the higher elevation are stronger and more reliable.
In Europe, which has emerged as the world leader in developing wind energy, wind farms now satisfy the residential electricity needs of 40 million consumers. Last year, the European Wind Energy Association projected that by 2020, wind would provide electricity for 195 million people – half the population of western Europe.
A 2004 assessment of Europe’s offshore potential by the Garrad Hassan consulting group concluded that if European governments move vigorously to develop this potential, wind could supply all of the region’s residential electricity by 2020.
Wind power is growing fast because it is cheap, abundant, inexhaustible, widely distributed, clean and climate-benign. No other energy source has all of these attributes.
Furthermore, the cost of wind-generated electricity has been in free fall over the last two decades. The early wind farms in California, where the modern wind industry was born in the early 1980s, generated electricity at a cost of 38¢ per kilowatt-hour. Now many wind farms are producing power at 4¢ per kilowatt-hour, and some long-term supply contracts have recently been signed at 3¢ per kilowatt-hour. And the price is still falling. (For data see http://www.earth-policy.org/Updates/Update43_data.htm.)
Unlike the widely discussed fuel cell/hydrogen transportation model, the gas-electric hybrid/wind model does not require a costly new infrastructure. The network of gasoline service stations is already in place. So, too, is the electricity grid needed to link wind farms to the storage batteries in cars.
One of the few weaknesses of wind energy – its irregularity – is largely offset with the use of plug-in gas-electric hybrids, as the batteries in these vehicles become a part of the storage system for wind energy. Beyond this, there is always the tank of gasoline as a backup.
Moving to the highly efficient gas-electric hybrids with a plug-in capacity, combined with the construction of thousands of wind farms feeding electricity into a national grid, will give us the energy security that has eluded us for decades, while dramatically cutting carbon emissions.
Lester R. Brown, International Herald Tribune