Yesterday’s
publication of a report on the comparative cost of different electricity
generation scenarios by AF Consult (available by following the link from here)
was well-trailed in advance. It was also
well-knocked in advance, as the government and renewables industries got in
their pre-emptive first strike.
The headline from the
report is a suggestion that the UK’s binding carbon reduction
targets can be met more cheaply by building gas and nuclear power stations
rather than wind turbines. It will be
like manna for those opposed to wind turbines, of course. But then, if it really is possible to meet
the UK’s
targets by a cheaper means than governments are currently pursuing, why wouldn’t
we want to do that?
As ever, it isn’t
quite that simple, and although ‘if’ is a small word, in this case it represents
a large caveat – or rather, series of caveats.
The first, and most
obvious, is that it assumes that the targets set for the proportion of
electricity which must come from renewable sources can simply be ignored. Breaking an international obligation – the target
is a binding one – is not exactly a minor issue. For sure, if the target is the wrong one,
then one can argue that it should be renegotiated; but simply to assume that it
can be ignored is not a safe assumption to make.
And it is
assumptions which go to the heart of the problem with this report. It’s based on a complex mathematical
model. There’s nothing wrong with that;
lots of things are based on mathematical models. But models are only ever going to be as good
as the assumptions with which they start; and in this case, my main argument
with the conclusions isn’t the methodology or the calculations performed, it’s
the assumptions which act as the starting point. And if the assumptions are wrong, it's hardly likely that the conclusions will be very robust.
Not all the
assumptions are explicitly stated; nor would I expect them to be. But four in particular are worth more
attention.
The first is the
question of future fuel prices, and the comparison between fuel prices. They have used the central estimates from a
DECC study. That’s an entirely
reasonable thing for the report authors to do; they have to start
somewhere. The question, though, is
whether the DECC have got it right, and on that point, I’m sceptical.
One of the big
advantages of renewables is precisely that they are not vulnerable to fuel
price shocks during their operational life (although, obviously, variations in
fuel price can affect construction costs, this is a small factor in the overall
cost comparison). Gas prices, on the
other hand, can be much more volatile. The
volatility is generally upward as world demand increases, although I’d accept
that shale gas – if we decide to exploit it – could change that equation. But to what extent do we want to gamble on the
price – or, potentially worse, put ourselves in a position where we are
dependent on fracking?
The second big
assumption concerns the cost of decommissioning nuclear plant and nuclear waste
management. Again, the report’s authors
have, entirely reasonably, used the assumptions to which the UK Government is
working, and which were detailed in a DECC report from Parsons Brinckerhoff in
2011. They had to start somewhere; my
problem with that, however, is that since no-one is yet entirely certain how
waste will be managed for the long term, there is a high degree of uncertainty
about the costs involved. Experience
suggests that they are more likely to increase than to decrease.
The third big
assumption is that at least some of the new gas plants can be fitted with CCS
technology. This assumption is key to
achieving the required reduction in carbon emissions, but as the report itself
conceded, the technology is to date unproven on the large scale required.
And the fourth is
that we do not expand the production on electricity to increase its use in
heating and transportation. If we do
make such an increase, then the carbon reduction targets cannot be achieved with the fuel split used in their scenarios. We would have to use
renewables.
I agree with the UK
Government assessment that this paper is badly flawed. The tragedy is that it will, nevertheless,
be recycled regularly in the local and national press by anti-wind campaigners
who will claim that it ‘proves’ that we shouldn’t be building new wind turbines. It actually proves no such thing (and didn’t even set out to prove that,
merely to compare the costs of alternative approaches of meeting a target).