You left out an important step - assuming that all the planning and modelling has been done correctly in and doesn't turn out to be politically motivated, have mistakes or miss unknown unknowns.
Reconstituting all of society's energy consumption is a large project with a lot of technical uncertainties that will be discovered along the way. These sort of forecasts routinely turns out to be very wrong. Centrally planned economies often look like they are about to power ahead when the plans are still on paper. It is only when people start starving that there is the "oh, the plan wasn't actually very good" moment and/or crackdown to cover up the disaster depending on how authoritarian the government has gotten.
Reconstituting all of society's energy consumption is a large project with a lot of technical uncertainties that will be discovered along the way. These sort of forecasts routinely turns out to be very wrong. Centrally planned economies often look like they are about to power ahead when the plans are still on paper. It is only when people start starving that there is the "oh, the plan wasn't actually very good" moment and/or crackdown to cover up the disaster depending on how authoritarian the government has gotten.