[ben_w]

Before you've built any green power plants, none of the energy you use to build green power plants can itself be green.

When all the power plants are green, all of the energy you use to build green power plants is necessarily green.

How green a new power plant is, during the process of construction, is a statement of how much progress you've already made before this step, not how much you make in the act of making this step.

[throwaway5081]

> Before you've built any green power plants, none of the energy you use to build green power plants can itself be green.

Another dimension is time. They can be considered "green" once they have produced more energy than was used for construction from non-green sources.

[gosub100]

its not a green plant if they conveniently escape all accounting. its a scam.

[ben_w]

They're also not escaping any such accounting, but that wasn't my point.

PV pays its own energy cost in a few months these days. But even then, the very first PV had to be made with mostly fossil fuels and some hydroelectric, now the new ones in China are made with 35% renewables.

Grids have the same question: how green it is to modify today is the current status of the power supply (etc.), not the status it will be when it's been modified.

[ViewTrick1002]

I remember seeing such a paper linked by a nuclear bro.

Going on and on about how important the LCA was and how nuclear should be the choice.

After pages and pages of ”sciency” equations it ends with the Chinese average grid mix in terms of gCO2/kWh.