Baseman: "
In the case of Ameila, it's different as there are no specific industrial drivers, just a national need to replace expensive imports with a cheaper domestic source and to take the nation well beyond it's current economic output.
You cannot look at the project cost @ % to GDP as a barometer. In the USA and Europe, energy costs accounts for 5% of GDP but I assume it will be higher for a developing nation. I don't know what the right number is, but I assume 10-15% would be acceptable, declining over the years."
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Nobody uses project cost to GDP to measure the viability of a project. I did not say that. That's your invention. However, organizations like Moody's, S&P and IMF will take this ratio seriously (along with others) when they judge the sustainability of your debt. Here the macro will certainly mess up micro like Greece.
I was not looking at a project justification, you referred to the 40% to GDP. My point is you are correct, that why you "marry" the debt to the investment and ensure the revenues from investment services and amortizes the debt, this way you ensure accountability. If this could be done by reducing energy costs as a % to GDP over time, then you are on the right track as you are replacing another imported source. The reason I referred to this is because the GDP will benefit in indirect ways and at the highest level, it's a sustainability measure, not an accountability measure.
Greece, Spain, Italy are in a mess as they were funding Social spending through debt financing. This is a fools paradise.