Distributed energy resources (DER) refers to often smaller generation units that are located on the consumer's side of the meter. Examples of distributed energy resources that can be installed include: roof top solar photovoltaic units. wind generating units. battery storage. Any small-scale device that can produce energy convertible into electricity qualifies as a DER, including the following: Rooftop solar panels Wind-powered generators Biomass generators Gas and diesel power generators Combined heat and power (CHP) systems Waste heat recovery systems Micro-hydropower schemes Hydrogen fuel cells EV and other power storage batteries Hence option (d) is the correct answer.