If you purchased alternative energy equipment for your home in 2018, you may be eligible for a tax credit of up to 30% of the cost of materials and installation. Qualifying equipment may include solar water heaters, solar panels, and fuel cell systems. If you end up owing no tax for 2018, you may be able to carry any surplus energy tax credit over to future years.
Under current laws, credits for home renewable energy equipment may be reduced after 2019 and will expire completely in 2021.