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Renewable
energy-resource development has remained far below hoped goals. It
is clear that a multiplicity of technologies will have to be
deployed for many years to come and that that large regional
variations for preferred approaches will characterize
energy-supply scenarios for the foreseeable future. A schedule for
new energy-technology developments has been written by Penner
(1998) (Penner, S. S., 1998, “United States energy supplies for the
21’st century”, Energy Conversion & Management, Vol
.23, No. 24, pp. 71-78.)
and shown in
Table 1.
Table 1 may
thus be easily updated to provide a revised 2004 perspective for
large-scale central power station development, this reflects only
in part the priorities set for sustainable development according
to the national plans:
1.
cancelled technologies
2.
deferred technologies
3.
long-lived technology additions
Table 2 lists
the world-wide
energy sources without consideration of utilization efficiencies
or technical readiness.
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