James G. Speight - Encyclopedia of Renewable Energy

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James G. Speight

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Energy (from whatever the sources – fossil fuel sources or renewable sources, often referred to as alternate sources) appears in many different forms, including electricity, light, heat, chemical energy, and motional (or kinetic) energy. An important scientific discovery in the 19 thcentury was that energy is conserved, which means that energy can be converted from one form to another but that the total amount of energy must stay the same.

Renewable energy can be derived from a variety of sources because the sources can be used and replaced without irreversibly depleting reserves or the sources (such as power from water systems, wind systems, and the sun) are consistently present in the Earth system, which makes these sources a valuable resource for the consistent production of energy. For this reason, renewable sources will continue to grow in importance as replacements for fossil materials used as fuels and as feedstocks for a range of products. Some renewable materials also have particular unique and beneficial properties which can be exploited in a range of products including pharmaceuticals and lubricants.

The concept is centered around a long-term vision that a significant proportion of the demand for energy and raw materials should be met through the commercial exploitation of science from crops, in a way which stimulates biodiversity and reduces greenhouse gas emissions and waste – particularly biodegradable waste going to a landfill site – and slows depletion of finite natural resources.

Fuels based on natural gas and crude oil are well-established products that have served industrial and domestic consumers for more than a hundred years. For the foreseeable future most of these fuels will still be largely based on liquid hydrocarbon derivatives. The specifications of such fuels will, however, continue to be adjusted as they have been and are still being adjusted to meet changing demands from consumers. Traditional refining of natural gas and crude oil underwent increasing levels of sophistication to produce fuels of appropriate specifications. Increasing operating costs continuously put pressure on refining margins but it remains problematic to convert all refinery streams into products with acceptable specifications at a reasonable return.

However, time is running out and natural gas and crude oil, once considered inexhaustible, is now being depleted at a rapid rate – the gas and oil from tight formations notwithstanding. As the amount of available natural gas and crude oil decreases, the need for alternate technologies to produce liquid fuels that could potentially help prolong the liquid fuels culture and mitigate the forthcoming effects of the shortage of transportation fuels that has been suggested to occur under the Hubbert peak oil theory. To mitigate the influence of the oil peak and the subsequent depletion of supplies, unconventional (or non-gas and crude oil) fuels are becoming a major issue in the consciousness of oil-importing countries.

In the near term, the ability of conventional fuel sources and technologies to support the global demand for energy will depend on how efficiently the energy sector can match available energy resources with the end user and how efficiently and cost effectively the energy can be delivered. These factors are related to the continuing evolution of a truly global energy market. In the long term, a sustainable energy future cannot be created by treating energy as an independent topic (Zatzman, 2012). Rather, the role of the energy and the interrelationship of the energy market with other markets and the various aspects of market infrastructure demand further attention and consideration. Greater energy efficiency will depend on the developing world market’s ability to integrate energy resources within a common structure.