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The issue is there is currently no mechanism for end consumers to moderate their behaviour based on energy related emissions.

Currently if users as a group demand more power than clean can provide, dirty gets turned on and everyone pays the highest cost.

We need a way for a consumer to be able to commit to only clean power, potentially at a lower cost but with limited supply.

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Do you not get charged different rates based on usage amounts? This is common across the world - where the first X KWH of usage per month cost a lot less than the next X.

Commercial contracts generally don't work that way, they generally pay the market rate (the current most expensive producer).

It means there is no way for an individual consumers behaviour to drive (or be driven by) the green energy proportion, as if the collective demand is too high then you pay the market rate for coal anyway.

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