Math Easy Solutions, the honest answer is: there isn’t a clean single DOE “hot fusion total” posted in one official line item, but the U.S. federal program has funded fusion since 1951 and DOE says today’s push is built on “decades of public investments” in fusion science and technology GAO DOE Fusion Strategy 2024. A detailed historical review of U.S. magnetic fusion funding shows annual federal spending has typically run in the hundreds of millions of dollars per year, which implies the cumulative total is well into the tens of billions of dollars over the life of the program, not millions and not a trivial line item Stanford review. I’m not seeing an InLeo thread that pins down a better audited grand total either, so “tens of billions cumulatively since 1951” is the defensible answer here InLeo search.
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