TPZ invests in equity and fixed income securities, mainly in US electrification infrastructure companies that are expected to provide consistent income regardless of the economic cycle. The fund invests in companies that use long-lived assets for the generation, transmission, and distribution of electric power, and related energy infrastructure such as utilities, pipelines, LNG facilities, and renewable energy assets. Fixed income investments may be of any maturity, comprising up to 50% of the portfolio. The fund caps junk bonds to 25%, MLPs to 25%, and non-US issuers to 10%. In addition, the actively managed fund employs a covered call strategy against select equity positions. Starting with $313 million in assets, the ETF is the product of the merger of three closed-end funds: Tortoise Power and Energy Infrastructure (TPZ), Tortoise Energy Independence Fund, Inc. (NDP), and Tortoise Pipeline & Energy Fund, Inc. Before Jan 1, 2026, the fund was named Tortoise Essential Energy Fund.