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So, given that we emit ~30 billion tonnes/year, we could do it for only 100 trillion dollars of electricity per year?

At 10 cents/KWH, that would be what, a million TWH?

For the record, the world's total electricity production is ~25,000 TWH.

Sounds about right. Borderline[0] nuts presently, but if electricity was 0.1cents per kWh, not much of a big deal. Which is very non trivial of course, but could conceivably be achieved with a few decades of work pushing fission or geothermal (whereas the electrical demands of CCS are fairly static, being thermodynamically limited.)

[0]borderline is probably too optimistic.

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