That means EI — not only for energy equipments but also for any industrial product — continuously increases.
How clean is ‘clean energy’? Renewables cannot solve the global crisis
Saral Sarkar
24232

It does not. Progressive refinement of manufacturing techniques (the industrial learning curve) reduces the energy cost of building things as the product matures. This applies equally to solar PV panels as it does to flat TV screens and drill bits for fracking.

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