What do the four most important technologies - solar, wind, biomass, and hydrogen - really have to offer?
 | Picture Gallery (click the image to start)Energy from Sun, Wind, Water, and Earth |
Wind
Many experts see wind power as the renewable source of energy with the greatest potential for growth and investment. Government and investor interest has increased significantly as wind has evolved into a more cost-effective mode of producing electricity.
The American Wind Energy Association reported that U.S. wind power grew 45 percent in 2007, the sharpest rise since the 1980s. Globally, wind energy capacity increased by 27 percent in 2007 to 94,100 megawatts.
Germany, currently a global leader in wind power production and consumption, produced roughly 26.5 billion kilowatt hours (kWh) of wind-generated electricity - the most of any form of renewable. This figure could dramatically increase in the coming years if the German government stays committed to reaching its goal of 20-25 percent reliance on renewables by 2010.
Other countries, including Spain, India, and China are also embracing wind power on a large scale. Private investors such as the Allianz Group have also recognized the opportunities of wind energy. Wind will play a central role in Allianz's plans to invest 300 to 500 million euros in renewables over the next five years.
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Solar
The various means of capturing the sun's energy - including concentrating solar power (CSV), photovoltaic (PV) power, and solar heating - also represent promising investment opportunities. Public solar firms - such as SolarWorld AG and Evergreen Solar Inc. - were some of the shooting stars on European and North American stock markets in Europe and North America.
Governments, such as Israel, China, and India, are also investing in the development of PV power stations that will supplement energy grids and provide affordable energy solutions for rural communities. The United States Department of Energy hopes that PV power will account for up to 10 percent of the nation's energy generation by 2030.
Biomass
Biomass is a term that refers to the variety of ways to that organic matter can be converted to energy, often through combustion or the production of gases and liquid fuels.
Biogas, biodiesel, and ethanol fuel investments have profited from record-high oil prices in 2008 and periodic turbulence in international relations. They also represent viable long-term alternatives to fossil fuels. If sustainably produced, some sorts of biofuels can allow for significant reductions in carbon emissions and dependence on energy from abroad, as well as providing a boost for many domestic economies, particularly in the agricultural sector.
Hydrogen
The buzzword "hydrogen economy" reflects the idea that hydrogen - the world's most abundant element - could someday replace fossil fuels and nuclear energy as a primary source of energy. Aside from hydrogen's high-energy content, what makes this resource attractive its ability to generate energy without producing significant levels of pollution. The typical by-product of hydrogen fuel cells, for example, is water.
The problem with hydrogen, however, is that with current technology it takes significant amounts of energy to produce hydrogen from water or other gases. Many hydrogen advocates thus see it as a means to store energy rather than a primary energy source. In combination with renewable energy, hydrogen could be the backbone of cleaner transportation and industries.
Although the vision of economies and industries driven by hydrogen may seem a long way from becoming realized, governments have already begun to invest in the development of hydrogen technologies, such as fuel cells.
The United States government introduced the Hydrogen Fuel Initiative in 2003, an investment of over one billion US dollars in hydrogen research and development. The success of recent schemes of introducing hydrogen-powered buses to European cities has also prompted the European Union to expand investment in and promotion of hydrogen technology.
No "silver bullet"
The four renewables discussed above and others, such as hydro power, are all being explored as sustainable and long-term alternatives to conventional energy sources. Each has the potential to help states and companies meet their energy requirements with cleaner and more-stable options. Entrepreneurs, researchers, and policymakers are all trying to find an effective balance between immediate and long-term initiatives.
"Wind and solar are becoming relatively mature, with major utilities and large manufacturers such as General Electric making a positive impact on our energy landscape right now, and doing so in a profitable way," says Andrew Shapiro, founder and CEO of GreenOrder, an environmental strategy firm based in New York City.
"There is also a robust and growing ecosystem of entrepreneurial firms, venture capitalists, and researchers exploring next-generation solutions - such as thin-film solar, cellulosic ethanol, or sterling engines," adds Shapiro. "Everyone in this field recognizes that there is no ‘silver bullet' for our energy future."
editor: Valdis Wish
latest update: May 4, 2009
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Readers' Comments:
I work for the Power Division of our Co. Thermax Limited, which specializes in design and manufacturing of biomass fired Boilers used in small capacity power plants (Up to 15 MWe). Though the official estimation of the potential to generate power from Biomass is 20,000 MWe, not more than 300 MWe of capacity gets created every year. The reason is attributed to two factors
- No organized supply chain for the biomass fuel. Many biomass power palnts find it cheaper to use coal.
- The price paid by the Power Distribution Co. for the power does not pose an attractive return for the potential investor in a biomass power plant of 6 Mwe or 8 MWe capacity. Moreover higher capacity power plants which operate at higher efficiency poses a problem as it is not economical to transport biomass to the power plant over long distances.
Anumanju Venkateswaran, India
It is time to find alternative source of fuel and any new idea is always welcome.
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Good article. Please send me the names of five biofuel crops mentioned in the article. And materials/articles on the issues and factors to consider in formulating a policy on renewable...