Using 'unitisation', most renewable projects - if the energy price and costs are right - are self funding, because you are receiving value now for something that costs nothing to create, other than maintenance costs (where people like Enercon already operate on a prodcution/revenue -sharing partnership basis) and decommissioning costs.
Energy savings (Nega Watts) are even cheaper, because there are typically no operating and decommissioning costs. An interest-free (in fiat money terms) 'energy loan' funds the project (if it stacks up), and then the project repays the loan at the market price of energy, funded from energy savings.
It's not Rocket Science: it's just a combination of monetising energy and energy accounting
It doesn't work quite so well for nuclear, because firstly the cost of fuel will go up over time in energy terms, and secondly there are uncertainties in relation to decommissioning and operating costs. "Any economic unit can emit money. The serious problem is to get it accepted" Hyman Minsky
