Dear Aubrey,

Delighted to support your campaign for fairness and good sense.

Kind regards


Prof John Twidell
AMSET Centre
Bridgford House
Leicestershire LE16 8DH

Global resources

Considering these aims and with the most energy-efficient modern equipment buildings and transportation a justifiable target for energy use in a modern society with an appropriate lifestyle E = 2 kW per person. Such a target is consistent with an energy policy of ‘contract and converge’ for global equity, since worldwide energy supply would total approximately the present global average usage, but would be consumed for a far higher standard of living. Is this possible, even in principle, from renewable energy?

Each square metre of the earth's habitable surface is crossed by, or accessible to, an average energy flux from all renewable sources of about 500 W. This includes solar, wind or other renewable energy forms in an overall estimate. If this flux is harnessed at just 4% efficiency, 2 kW of power can be drawn from an area of 10m * 10m, assuming suitable methods. Suburban areas of residential towns have population densities of about 500 people per square kilometre. At 2 kW per person, the total energy demand of 1000 kW km -2 could be obtained in principle by using just 5% of the local land area for energy production. Thus renewable energy supplies can provide a satisfactory standard of living, but only if the technical methods and institutional frameworks exist to extract, use and store the energy in an appropriate form at realistic costs. This book considers both the technical background of a great variety of possible methods and a summary of the institutional factors involved. Implementation is then everyone's responsibility.
Renewable Energy Resources
By John Twidell, Anthony D. Weir







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