by Bardal » 07/12/18, 19:29
A few small remarks on the debate and the calculations attached to it.
- for obvious reasons, it is not relevant to compare the various sources of electricity from the installed power; it is the binomial power-rate of real charge, therefore the annual production, which constitutes the least bad index of comparison; it should also be noted that this production should be confronted with hour-by-hour needs, a production arriving when there is no need for it being in principle lost.
- neither is there any need to "calculate" the percentage of non-controllable energy from which major back-up and grid stability problems will arise in France, RTE has already done this and it is around 25% of production (it is moreover this figure, reached, which begins to pose serious problems to Germany, which relies on its coal plants and on French nuclear power to solve them). But the real problems start long before, since any non-controllable substantial production results in a decrease in the production of controllable means, and therefore in a drop in their profitability (this is what has cost the lives of various gas power plants. Germany, and some economic problems in its energy industry).
- it is just as useless to try to assess the back-up capacity necessary in a given country, it is 100% of the maximum needs, essential to ensure supply in the event of a windless period (for PV, it happens every day at 17 p.m., until 9 a.m. the next day in winter).
- it will be noted that a country like Denmark, which has an installed wind power capable of covering more than its maximum needs, actually only consumes 30% of this electricity, the main part being exported to Norway (to step) or Germany; It works because it is a very small country, able to rely on the hydroelectric potential of Norway and the very large German consumer, but that does not prevent it from being a very large emitter of CO2.
Finally, economically, the least bad investment comparison index is the cost of the installed kW divided by the annual load rate; the use of the simple cost of Wcrête promises severe disillusionment to dreamers. Thus, Germany has already committed nearly 500 billion euros to install 25% of its electricity production; and 75% remains to be done ... And what will it be when it comes to electrifying land transport ...
We are very little ...
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