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renewable energy > features > renewable hope for the south

Renewable hope for the South

Posted: 07 Nov 2000

by Walt Patterson

Emerging countries will lead the way in small-scale sustainable electricity, says Walt Patterson.

Sustainable development requires sustainable energy. And sustainable energy will have to include sustainable electricity. As yet, we do not know what sustainable electricity looks like. But we have a pretty clear idea of what unsustainable electricity looks like. It looks like the traditional form of electricity that has spread over much of the planet through most of the past century.

The traditional electricity system is shaped by the economies of scale associated with water turbines and steam turbines. Large remote central stations based on these machines generate electricity in the form of synchronised alternating current, and deliver it to users over a network including long high-voltage transmission lines. This technical configuration has been spectacularly successful, so much so that most people in OECD countries take electricity completely for granted.

But traditional electricity systems have failed to reach more than two billion people, one-third of humanity. Moreover, the three most important traditional generating technologies hydroelectric dams, coal-fired stations and nuclear stations now face severe challenge, not only for their environmental impacts but also for their daunting capital cost.

Gas turbines

Traditional electricity systems are franchised monopolies. Traditional planners can order enormous plants, costing billions of dollars, taking six years or more to complete and at least another twenty years to pay off, because captive customers pay all the costs and bear all the risks. However, as electricity systems are freed from government control, shareholders and bankers have to share the risk; and long-term investments in traditional generating technologies become seriously risky.

At the same time, new generating options are emerging, more attractive both financially and environmentally. First comes the gas turbine, fuelled by cheap and abundant natural gas. Wherever natural gas is available, gas-turbine generation is now the option of choice.

Gas-turbine generation is economic at a smaller scale. It exhibits economies of series manufacture, with a rapid learning curve. It is modular, expanding capacity by adding more modules. It can be ordered, built and brought into service in less than three years. It is easier to site, cleaner and more convenient than the traditional technologies. It can therefore be located close to or indeed on the premises of electricity users.

The rise of gas-turbine generation is changing the technical configuration of electricity systems, from centralised towards decentralised, with more and smaller generators closer to users. Other innovative generating technologies with similar attributes are reinforcing this new trend, for example, mini- and micro-turbines, fuel cells, and a portfolio of renewable energy technologies including micro-hydro, wind, biomass and photovoltaics.

The traditional synchronised AC system demands large-scale centralised dispatching and control; power electronics, however, now allows systems to be much less tightly integrated and more flexible. The capabilities of new data-handling and system management technologies are likewise burgeoning.

Local systems

If communities, companies and other local users generate their own electricity close to where they use it, they will want to make sure it is used as effectively as possible, with high-performance buildings, lights, motors, electronics and so on. They will think in terms of the whole local system, not just the 'energy source'. They will want to optimise the whole system to deliver the services they want comfort, illumination, motive power, information not just the electricity. Optimising the whole local system thus makes sense both financially and environmentally.

The implications are profound. Much of this Energy sub-site of People & the Planet has focused on local systems where people are still awaiting the benefits of electricity. Where the traditional large-scale centralised model faces insuperable obstacles, only local systems have any hope of delivering electricity services. The remarkable fact, however, is that even in the rich countries of the OECD, the shape of electricity is now evolving in the same direction, away from the traditional model towards a much looser network of local systems.

By a powerful irony, where people do not now have traditional electricity, they are also free of its technological and institutional inertia. They will be able to establish the innovative model much faster. As we enter the new millennium, today's emerging countries will lead the way towards sustainable electricity.

Walt Patterson, Senior Research Fellow in the Energy and Environmental Programme of the Royal Institute of International Affairs, London, is the author of Transforming Electricity, Earthscan, 1999.

Quebec windmills

Quebec is a leading proponent of achieving the Kyoto target for Canada of 6 per cent reduction of greenhouse gas emissions below 1990 levels by the year 2012. It has a huge competitive advantage in the fact that it has so much hydroelectric power. It is now expanding that advantage by moving into windpower.
© Jose Santamarta

The first seven of 133 windmills starting turning last October at the Le Nordais Wind Farm, Quebec. Being built as a cost of C$160 million, the windmills are perched on the blustery north coast of the Gaspe peninsula in the Gulf of St. Lawrence. The �farm� of 55 metre windmills can produce 100 megawatts, enough to power 16,000 households, making it the largest such development in Canada.

�Only about four other projects in the world were built to this size,� says Yvan Dupont, President of Axor International Inc. the privately owned Canadian member of the consortium building Le Nordais.

The largest such projects in Canada to date are in the windswept western prairie province of Alberta, which can generate 21 megawatts. With Quebec accounting for more than half of Canada�s wind energy potential, Axor hopes to build more sites that can produce up to 3,000 megawatts of windpower.

Source: Reuters Ltd, 1998.

© People & the Planet 2000 - 2007
Solar panels provide homes with electricity, In Cacimbas, Ceara, Brazil. Photo: Roger Taylor/NREL
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