More Ngrams: nuclear power,solar energy

This is kind of interesting: nuclear is more associated with the word ‘power’ than with the word ‘energy’ (here) and solar more associated with the word ‘energy’ than with the word ‘power’ (here), though I suppose it is in part explained by the fact that we use ‘nuclear power’ to denote both energy derived from nuclear reactions and countries possessed of nuclear armaments, while there is no corresponding tic in usage in the case of solar that I can think of.

But what might be the reason for the huge divergence in mentions of power and energy circa 1980? –power over energy with respect to nuclear and energy over power with respect to solar? The oil crisis must be involved but I can’t think of why. Wind power,wind energy occurrences are also elevated in 1980 but there isn’t the same divergence between the two. Nor does power,energy tell us much: ‘energy’ reached its apex during the crisis, while ‘power’ was drifting towards its lows.

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