Billions a year for the last hundred years (or whenever the technology became available). [1] This does not represent all of the subsidies, indirect and direct, nor the huge advantage that fossil fuel industry enjoys with millions to spend on lobbying and purchasing senators, that is, when the senators aren't already getting rich in the fossil fuel industry (see Joe Manchin and every 1 in 4 senators)[2].

[1] https://cen.acs.org/articles/89/i51/Long-History-US-Energy-S...

[2] https://www.salon.com/2021/11/07/one-in-four-us-senators-sti...