The Forum > General Discussion > Nuclear Power and DCF
Nuclear Power and DCF
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(Now, there are other issues with nuclear power, but this thread is about honesty in representing the financial costs).
A couple of common claims are
a) That the decomissioning costs are so high that if they are included in the cost of the power stations then nuclear power becomes uneconomic.
b) Since the nuclear waste has to be stored pretty much forever, this means that the cost of doing so is infinite.
Neither of these claims are true, because of the way discounted cash flow (DCF) works. See http://forum.onlineopinion.com.au/thread.asp?discussion=96 for a discussion of DCF.
A consequence of that is that if a power station lasts 50 years, then the cost of decommissioning it at the end of its life with a discount rate of 4%, the cost of decommissioning has to be divided by 7 before being added to the cost of construction. Since the decomissioning costs are in any case not large compared with the cost of construction, this means that decomissioning has a minimal effect on the cost of the electricity.
I've chosen 4% for the discount rate because it is approximately equal to the difference between the current interest and inflation rates.
Even if the waste has to be stored forever, then the present value of doing so is simply the amount of capital required to produce a real annual interest equal to the annual cost. With a rate of 4%, this means that for every $1 annual cost of storage, we need a present day investment of $25. This is really the cost of storing the waste as from today. If the waste only has to be stored after the station is decomissioned, then that figure is divided by 7. In practice, the waste will be produced during the life of the station, so the true figure lies between the two.
Sylvia.