Hello,
I am having some trouble with explaining why the All-equity solar arrays would have a higher levelized cost of energy than projects with debt. Those are the results that I have found and I have read the same conclusion in some of NREL's published work that uses SAM (See reference below). It seems like the All-equity costs would be cheaper than the debt options.
Here are my guesses as to why they aren't. The All-equity option implies that outside players are buying equity from the project so the primary project owners have to pay out a portion of the profits. From what I have read in the description of the All-equity model, I don't think this is the case since.
My other hypothesis is that if the discount rate is higher than the interest rate the All-equity option becomes more expensive than a project with debt. What are your thoughts on why the All-equity option is more expensive?
Best,
Mahayla
Mendelsohn, M., Kreycik, C., Bird, L., Schwabe, P., Cory, K. (2012, March). The Impact of Financial Structure on the Cost of Solar Energy. Golden, CO: National Renewable Energy Laboratory.