Examples of DERs include rooftop solar systems, battery storage systems, generators, electric vehicles, and demand-side management programs. . Distributed generation, also distributed energy, on-site generation (OSG), [1] or district/decentralized energy, is electrical generation and storage performed by a variety of small, grid -connected or distribution system-connected devices referred to as distributed energy resources (DER). Unlike centralized power plants, DERs produce electricity closer to users, minimizing transmission losses and increasing efficiency. These systems can operate independently or be. . DERs are small modular energy generators that can provide an alternative to traditional large-scale generation. Let's take a close look at some samples of DERs. Battery storage systems play a. .