The Fund will invest not less than 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of clean energy companies. Duff & Phelps Investment Management Co., the Funds sub-adviser (the Sub-Adviser), defines clean energy companies as those that derive at least 50% of their value from one or more of the following clean energy businesses: (a) the production of clean energy (e.g., biofuel, biomass, hydroelectricity, solar energy, wind energy, and battery storage, among others); (b) the provision of clean energy technology and equipment; or (c) the transmission and distribution of clean energy. In determining whether a company derives at least 50% of its value from clean energy businesses, the Sub-Adviser evaluates the percentage of the companys reported or estimated revenue, profits, assets and capital expenditures that are allocated to, or derived from, the clean energy business.