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Coal
The fact is, in 1989, electricity, sourced from coal-fired power plants had a production cost of $0.30 / kWh, same as solar-PV.
I provided the community of participants referenced by the author of the paper which under-girded the quanta.
If you have counterfactual evidence to the contrary, you're certainly free to share it. Who, what, when, where, and how.
Your prima facie evidence must represent the 'social cost' of coal-based electricity. Which will eliminate around half of the economists in the USA.
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