In recent years,
there has been more and more talk of a transition to renewable energy on the
grounds of climate change, and an increasing range of public policies designed
to move in this direction. Not only do advocates envisage, and suggest to
custodians of the public purse, a future of 100% renewable energy, but they
suggest that this can be achieved very rapidly, in perhaps a decade or two, if
sufficient political will can be summoned. See for instance this 2009 Plan to Power 100 Percent of
the Planet with Renewables:
A year ago former vice
president Al Gore threw down a gauntlet: to repower America with 100 percent
carbon-free electricity within 10 years. As the two of us started to evaluate
the feasibility of such a change, we took on an even larger challenge: to
determine how 100 percent of the world’s energy, for all purposes, could be
supplied by wind, water and solar resources, by as early as 2030.
See also, as an
example, the Zero
Carbon Australia Stationary Energy Plan proposed by Beyond Zero
Emissions:
The world stands on the
precipice of significant change. Climate scientists predict severe impacts from
even the lowest estimates of global warming. Atmospheric CO2 already exceeds
safe levels. A rational response to the problem demands a rapid shift to a zero-fossil-fuel,
zero-emissions future. The Zero Carbon Australia 2020 Stationary Energy Plan
(the ZCA 2020 Plan) outlines a technically feasible and economically attractive
way for Australia to transition to a 100% renewable energy within ten years. Social
and political leadership are now required in order for the transition to begin.
The Vision and a
Dose of Reality
These plans amount
to a complete fantasy. For a start, the timescale for such a monumental shift
is utterly
unrealistic:
Perhaps the most misunderstood
aspect of energy transitions is their speed. Substituting one form of energy
for another takes a long time….The comparison to a giant oil tanker,
uncomfortable as it is, fits perfectly: Turning it around takes lots of time.