- Battery storage stores energy and can be used locally, fitting the definition of a DER. - Biomass generators can be deployed at various scales, including small-scale, localized generation which qualifies as a DER. - Fuel cells are capable of providing localized power generation and can be considered DERs. - Rooftop solar photovoltaic (PV) units are a quintessential example of DER, generating power at the point of use.