Why are the 80 % of the available fossil fuels that we must leave under the ground, the Shockley-Queisser limit and the "pumped hydro 365 factor", three major parameters of tomorrow’s PV economics? What has Germany’s policy taught us about variability management and the need for new high voltage lines? Can solar electricity be produced after sunset? Are negative and positive feed¬backs a common feature of climate science and PV development? Should the next climate conferences rely on climate economists, PV technical specialists and industrial economists working together?
Denis Bonnelle, a physicist, an economist and a French senior official, tries to answer these questions without taboos, e.g. about decentralization.