Distributed Generation

Distributed Generation (DG) is the production of electricity from small or medium-scale sources located near the point of consumption, interconnected with distribution networks or used on-site, rather than centralized large power stations alone.

Expanded Explanation

1. Technical Function and Core Characteristics

DG refers to electric power resources that connect to the distribution-level grid or serve loads at or near customer sites. These resources typically include small gas turbines, internal combustion engines, fuel cells, photovoltaic systems, small wind turbines, and Combined Heat and Power (CHP) units. They usually range from a few kilowatts to tens of megawatts and can operate in parallel with the grid or, in some configurations, in islanded mode through microgrids.

DG units interconnect through inverters, switchgear, protection systems, and control equipment that manage voltage, frequency, power quality, and safety. Grid codes and interconnection standards define how these units ride through disturbances, provide reactive power, and disconnect under abnormal conditions to protect equipment and personnel.

2. Enterprise Usage and Architectural Context

Enterprises use DG to support facility power needs, reduce exposure to grid outages, manage energy costs, and meet regulatory or internal carbon objectives. Common deployments include on-site solar photovoltaic systems, gas-fired CHP plants, and backup generators that can participate in grid programs. In some architectures, DG integrates with energy storage, building management systems, and Electric Vehicle (EV) infrastructure to support load management and demand response.

From an architectural perspective, DG resources System Integration Testing (SIT) at the network edge of the power system, often behind the customer meter or at distribution substations. They require coordination with utility protection schemes, cybersecurity controls for monitoring and control interfaces, and data integration with enterprise energy management and Operational technology (OT) platforms.

3. Related or Adjacent Technologies

DG relates closely to microgrids, which use local generation, storage, and control systems to operate in both grid-connected and islanded modes. It also interacts with distributed energy resources more broadly, a category that includes demand response, electric vehicles, and stationary storage. Standards for Distributed Energy Resource (DER) interconnection, such as inverter performance and grid support functions, affect how DG units behave under normal and contingency conditions.

Advanced distribution management systems, DER management systems, and Supervisory Control and Data Acquisition (SCADA) platforms often coordinate DG fleets. These systems control power dispatch, monitor performance, and ensure compliance with utility operating limits, voltage constraints, and protection settings across the distribution network.

4. Business and Operational Significance

For enterprises, DG affects power reliability, energy cost structures, and exposure to grid tariffs and market programs. On-site generation can support continuity of operations and enable participation in demand response, capacity markets, and ancillary service programs where regulations permit. It also affects carbon accounting and environmental reporting because on-site resources may alter direct and indirect emissions profiles.

Grid operators and utilities treat DG as part of distribution system planning, protection coordination, and resource adequacy analysis. Higher levels of DG require updated interconnection standards, forecasting, and visibility to maintain voltage control, system stability, and safety of field crews, and they introduce additional data, cybersecurity, and control requirements for integrated enterprise and grid operations.