How long is the SGIP process? IT Support January 30, 2021 00:11 Updated The average timeline is 6-9 months from start to finish. Related articles I plan on taking the federal tax credit, will this affect my rebate? What is SGIP? Is the SGIP rebate different from the federal tax credit (ITC)? What are the different budget categories that Semper Solaris commonly applies for? What are the SGIP approved rate plans per utility? Comments 0 comments Please sign in to leave a comment.