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I work in an Intel fab.

To the extent that Intel has invested in overseas fab capacity, it is because that spending has been heavily subsidized by foreign (non-US) governments.

If the desire is to build more fab capacity in the US, what proposal other than fab subsidies do you have to "make it economical" to invest in the US?

The cost of operating a $20 billion fab is completely dominated by depreciation. Assume a 5 year depreciation schedule and 1000 employees earning $200k/year. Depreciation amounts to $4 billion per year versus $200 million for employees. You can't make it economical without addressing the equipment cost. And that equipment isn't any cheaper in Taiwan. So if you want to encourage US investment, and compete against the foreign countries that do subsidize, what do you suggest other than subsidies for capital?

The market forces are foreign subsidies for semiconductor fabrication capital.

AMD has not made flash memory for many years. They put their flash assets into Spansion and spun that out (before they purchased ATI, IIRC).

I think your calculations are off by a factor of ~ 24. Assuming a 4 week month, and 168 hours per week, the monthly power lost is 45*168*4 = 30240 W-hr = 30.2kW-hr. At 6.2 cents per kW-hr, that is over $1.80 per month. Over 5 years, that puts you at over $100 total.

AMD has no flash anymore -- they spun out the Spansion joint venture last year. AMD is entirely a CPU company now.