April 18, 2005 |
"As I continue to explore the use of ocean power technologies, I find
it amazing that no matter where we go along the coasts of the continental U.S.
and Hawaii, just about every area is suitable for at least one type of ocean
energy technology."
- Dan White, RE Insider
[RE Insider] If I told you it was possible to generate enough power to sustain the United States forever without releasing greenhouse gases or noxious pollutants and without dependence on foreign nations-would you be interested? The U.S. Government doesn't appear to be.
Homeland Security means a great deal more than patrol ships, surveillance,
intelligence, and devices for threat detection-all important. However, these
things will not secure our nation without first establishing "energy
security" which is directly related to the economy. Without a strong
economy we would face a threat greater than any other we face today.
I love statistics-they serve as an effective "wake-up" call. The
February 2005 issue of Fortune Small Business magazine was full of them in its
focus called "Who needs Oil". Here's a few. "If the U.S. relied
on its own oil it would run out in 51 months." "Appliances that are
switched off but still plugged in account for 5% of U.S. energy consumption and
cost consumers $3 billion annually." "The 20 states that lost 76% of
the manufacturing jobs in the U.S. over the past 4 years also happen to have the
technical capability to capture most jobs from the wind industry."
"The sun sheds enough energy on Earth in one minute to meet its energy
needs for an entire year."
Renewable energy may hold the key to both national security and economic
stability as demand is surging in China, India and other developing countries,
while, at the same time, production is falling in 33 of the world's 48 largest
oil producing countries. U.S. oil production peaked in 1970 at 8 million barrels
per day and fell to less than 3 million barrels per day in 2004.
Frank Gaffney, former National Security Advisor to President Reagan, put it
best, "We find ourselves dependent on imports from people who, by and
large, are hostile to us. It makes (energy independence) a national security
imperative."
By the year 2025 as much as 68 percent of the U.S. Petroleum demand could depend
on imported oil, according to the U.S. Department of Energy's Energy Information
Administration (EIA).
The math is clear. We may always use some oil, gas, and coal, but we won't have
enough, and no, nuclear energy is not a renewable source.
Ok, now some more leading questions. "What is the largest energy source on
Earth?" -- that's right, the ocean. Most grade school kids know that the
ocean absorbs heat from the sun, which, simply put, creates wind, which creates
waves, in turn producing ocean currents. The sun and the moon work together to
produce tides. The temperature difference between the warm surface waters and
the cold deep waters of the ocean represent a significant potential energy
source.
Here is another one. "Together, the seas and oceans cover an area nine
times greater than the surface of the moon." This equates to about
369,315,000 square kilometers or about two-thirds of the earth's surface. How
much energy does the ocean store, you ask? It is estimated that each day, the
oceans absorb enough heat from the sun to equal the thermal energy contained in
250 billion barrels of oil. The world currently consumes more than 3 billion
barrels of oil per day.
Can the ocean provide all the types of energy we require? Well let's see. First
and foremost we need electricity. This can be provided by a number of
approaches, e.g. offshore wind, wave power, current and tidal power, thermal
energy conversion and even salinity gradients. Next we need fuel to power our
transportation industry. Hydrogen and ethanol appear to be preferred fuels at
the moment. Yes, we can get hydrogen and ethanol from some of the same machines
that produce electricity in the ocean.
It appears that Europe is getting the message. North Sea oil fields are
diminishing quickly, which has given rise to studies on how these countries will
be able to provide themselves with energy in the future. In Europe, an estimated
150,000 square kilometers of ocean would provide an area for offshore wind farms
that would provide enough power to satisfy all of Europe's electricity demands.
It is estimated that 0.1% of the energy in ocean waves could be capable of
supplying the entire world's energy requirements five fold. The UK and Australia
already lead the world in Ocean Energy technology implemented utilizing wave and
current devices.
There are many ways to look at our growing need for electricity. Take just the
United States for example. According to the 2004 World Energy Report from the
International Energy Agency (IEA), at an annual use of 3,659,990,000 MWhrs in
2002 the U.S. wins hands down for total energy needs of all the developed
countries.
Now, just for fun, how many wind, wave, current plants would it take to provide
10 percent of the United States' power requirements? First we must make an
assumption on how much electricity the plant will produce. To do this I will
take the Cape Wind offshore wind farm and extrapolate a number. This wind farm
is a 420 MW (peak installed capacity) project that will produce about 1.5
million MWhrs per year. If we use this number, which takes into account the wind
patterns over a year, we should be conservative in our calculations.
The top 12 users of electricity represent more than 70% of the total worldwide
usage. Total MWhrs for those nations in 2002 was roughly 10,000,640,000 MWhrs,
according to the IEA. The world total for the same year was 14,283,530,000 MWhrs.
For less than 10,000 worldwide ocean energy power plants of only 500 MW, you
could have a world powered by clean renewable energy and reverse global warming.
I'm not selfish. We should consider all renewables in this equation, at least
the ones that do not use fossil fuels in their process (e.g. the predominant
hydrogen generation techniques use fossil fuel). If one decided that ocean
energy would provide 10 percent of the world's electricity, then that would
equate to 952 ocean energy farms. The U.S., alone would require only 244 power
plants -- now it starts to make a great deal of sense! The U.S. has some 10,759
miles of coastline, that would equate to one power plant/farm per 44 linear
miles along the coastline.
The Cape Wind installation is 130 wind turbines, which will produce 420 MW of
electricity or 3.2 MW each. The wind farm will occupy 24 sq. miles producing
62,500 MWhrs per sq. mile.
Back to the 244 ocean energy farms off the U.S. coastline. We would only require
5,856 sq. miles (an area 77 miles by 77 miles) to achieve our 10% goal. This
does not take into consideration deepwater installations such as wave, Ocean
Thermal Energy Conversion (OTEC) and current, and larger installations, which
would increase the spacing of energy sources.
The U.S. was a tough one because of the amount of electricity we use. However,
with fossil fuel availability diminishing, ocean energy will be required to
supplement our growing need for energy.
Now, let's look at an island nation like Jamaica. Jamaica used 5,850,000 MWhrs
of electricity in 2002. That would have required 4 of our 500 MW ocean energy
plants to power the entire island. It is feasible that just two OTEC plants
could provide 100% of this requirement and provide millions of gallons of fresh
water daily as a byproduct-what a bonus for islands!
The facts about the use of energy from the ocean are indisputable and with the
large concentration of populations along coastal areas, ocean energy can be
found nearby.
Energy without any harmful emissions or global warming effects, and in some
cases such as OTEC, has the added benefit of freshwater as a byproduct. A 10 MW
OTEC plant could produce about 3 million gallons of freshwater per day -- a real
bonus for islands or developing countries.
The technology for putting equipment in the ocean was developed years ago and
has been demonstrated repeatedly in oilfield applications. If we (the world's
engineers, designers and manufacturers) can build an offshore oil rig such as
BP's 75,000-ton, semi-submersible offshore production, drilling and quarters
platform-Thunder Horse-and bring it across the ocean from Korea on a giant
vessel, then moor it with a 16-point semi-taut chain-wire-chain system in 6,040
feet of water-I think we can safely say we can build and install offshore ocean
energy plants of any kind, size, shape or water depth.
As I continue to explore the use of ocean power technologies, I find it amazing
that no matter where we go along the coasts of the continental U.S. and Hawaii,
just about every area is suitable for at least one type of ocean energy
technology. (pull quote)
There is no one choice-wind, wave, current, tide, OTEC, etc. Each technology
will need to be used to meet the U.S. energy needs. There is no one location.
All areas will have to be exploited.
Now my least favorite... "Is renewable ocean energy a national
priority?" Sadly no. But it once was!
From about 1977 to 1983, there was a movement towards harvesting Ocean Energy
that is unmatched today. In 1980 and 1981 the U.S. Department of Energy's
appropriation for Ocean Energy Systems alone was over $30 million, but the money
disappeared over time as budget cuts forced its eventual demise, and the demise
of the agencies responsible for overseeing the technology.
Ocean Energy's time is here. The government, and yes, even the oil & gas
companies must take the lead in moving the technologies forward, not favoring
any one renewable energy type over another. Remember the train companies - if
they had realized they were in the transportation business they would probably
be flying jets. Trick question-What business are the oil & gas companies in?
Maybe the numbers I used in this article are arguable, and I can imagine that
some will want to argue. But that's not the point. No one has yet to show me
that Ocean Energy is unfeasible. Energy independence is just around the
corner...or should I say "just offshore".
About the Author
Dan White is the founder of Technology Systems Corporation and the publisher and
editor of Ocean News & Technology magazine. In addition, he is the organizer
for EnergyOcean 2005. The conference will be held in Washington D.C. April
26-28, 2005, http://www.energyocean.com.
Mr. White holds a B.S. in Ocean Engineering from Florida Atlantic University.
For over 20 years prior to starting the publishing company in 1993, Mr. White
worked for several companies in the defense, oil & gas and ocean science
industries. Dan can be reached at dwhitetsc@mac.com
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