It's a hard to say, but in your case every dollar of solar subsidy probably reduces ratepayer cost by $1.50 or more.

Adding marginal capacity to the NYC grid costs a fortune to ratepayers, as siting a plant will take a decade and cost billions, and transmission capacity is already constrained -- nearly limitless hydropower is available from Quebec, but it requires massive infrastructure investment to move!

That's why New York subsidizes solar and heavily subsidizes peak load reduction.