No. A new jet engine is ~$10M, so a retired jet engine is probably ~$1M. The article says a single jet engine can handle a 1GW plant, translating to less than

No. A new jet engine is ~$10M, so a retired jet engine is probably ~$1M. The article says a single jet engine can handle a 1GW plant, translating to less than 1% of the cost of the power plant. (Electric capacity is of order $1/W https://en.wikipedia.org/wiki/Price_per_watt https://en.wikipedia.org/wiki/Price_per_watt ) Some cleaning retrofits are do-able and worthwhile (just like the jet engine), but making power plants clean to developed-world standards is an order-unity fraction of the cost.