California and Hawaii do not provide detailed performance standards within the legislation, these states have separate solar-specific equipment certification and contractor licensing requirements. Two other states with tax credits—Hawaii and Oklahoma—also have equipment certification standards and/or special contractor licenses to help ensure adequate performance. North Carolina lacks these state requirements but provides detailed equipment standards within the tax-credit legislation. More stringent quality assurance is required in Utah, Rhode Island, and Oregon. These states require that applicants obtain certification prior to (Oregon) or following installation (Utah, Rhode Island) of the system to qualify for the tax credit
