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The article was comparing coal costs vs Solar and Wind. Carbon output from fossil fuels suggests not only coal, but also oil and natural gas.

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Coal is much cheaper than oil and comparable to natural gas. https://www.eia.gov/electricity/monthly/update/resource_use....

Oil is a very small part of electric generation. Natural gas has gotten a lot cheaper than coal, which is why so many coal plants are being shut down.

More recently, renewable has started to get cheaper than natural gas.

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