The Hawaii Department of Taxation released temporary regulations November 9 that change the way taxpayers calculate their renewable energy technologies tax credit for other solar energy systems, by basing the credit on the system’s capacity for KW output. The temporary regulations require a single-family residential property system to have a five KW total output capacity; multifamily systems must have at least 0.360 KW output per unit per system; and commercial property systems, 1,000 KW.