My SGIP check was written by PG&E, not the State, so I treated it as a utility rebate.
There are two tax issues and one SGIP issue here. What I understand is:
1) An SGIP rebate is not considered taxable income.
2) One can take both the income tax credit and an SGIP rebate, but,
3) SGIP rebate is limited to the system cost less any ITC taken.
So, no double dipping.
My recollection is that the application for the SGIP rebate implicitly asks how much ITC you are claiming, and deducts that from the system installed price to calculate the rebate. My PW rebate (equity resiliency budget) was $13,200, i.e. $1 per Wh of storage using the 13.2kWh PW spec from CEC, I think. The total installed cost was $14,900, so I was out only $700.
If I had gone for 2 PW, which I now wish I had, what with PW new Export Everything capability, SGIP would have covered 100% of the cost: The cost would have been around $22K, and the maximum rebate 26.4K, but limited to the $22 cost. Too bad that budget is exhausted!
But I gotta say it sure was swell getting that check from PG&E, of all people.
SGIP is a state CPUC program and budget, only administered by PG&E, so it is not PG&E money. But it was not taxable income, which a lottery winning would be.
Unlike utility rebates, rebates from state governments generally do not reduce your federal tax credit.
True, but SGIP reduces the rebate by the amount of the credit, it seems.
SW