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Shower thought: I live in an area that has 100% green electric power generation. If I use more power than necessary, does this increase or decrease my net carbon footprint? Say I pay out of my pocket to run 1 MJ of green power through a resistor. What effect does this have on my carbon footprint, as defined by the difference in overall emissions compared to the counterfactual world in which I didn't do this?
I have conflicting thoughts:
Power is power. If I didn't use that power, it could have been used instead of coal-derived power by somebody else. And obviously, most people would prefer to use greener power rather than less green power, if given a choice - and this argument holds all the way down the chain to the person using the least green power available. So the net addition to my carbon footprint when wasting 1 MJ of energy is determined by whatever it takes to produce 1 MJ of power at the tail end (i.e. coal). Or a slightly refined version: By supply and demand, increasing demand on green power just drives up the price of green power, causing more people to use non-green power because of the price differential, thus leading to the same 1 MJ to be burned in coal plants to cover the waste.
As a consumer of green power, I am essentially paying for the construction of green power plants. So all I'm doing is subsidizing the production of more green power, so my net carbon footprint is the sum of what it takes to build that infrastructure, minus whatever benefit will be derived from it after I'm done using it - so probably effectively neutral (or slightly negative).
"100% green power" is nonsense marketing, because electricity on a grid is the ultimate fungible commodity. During periods of high load, your marginal watts are being generated by a simple cycle gas turbine just like everywhere else, but you pay an extra indulgence fee to be told it was "net green."
Avoiding use (especially during high load periods) is the only way to do anything about that.
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