Oftentimes, facilities underestimate the complexities of deploying a microgrid beyond installing equipment. Any microgrid project that plans to run parallel to the grid must successfully complete the interconnection process to ensure the system operates safely, reliably, and in coordination with the local utility and governing bodies. Whether serving a data center, healthcare facility, utility, or industrial operation, a well-planned interconnection strategy reduces delays and supports long-term operational performance.
As a turnkey microgrid provider, PowerSecure helps customers navigate every phase of implementation, from site assessment and engineering through utility coordination, commissioning, and ongoing operational support.
Typical Steps in the Microgrid Interconnection Process
While some facilities may encounter unique requirements from local governing authorities or utilities, most projects move through a similar interconnection process. Knowing what to expect and planning early can help reduce delays and keep your microgrid project on schedule.
- Site Assessment and Project Scoping: The process begins by evaluating the facility’s existing electrical infrastructure, identifying critical loads that the facility’s microgrid will need to support, and defining overall operational goals. These details help establish the technical requirements for the project.
- Application and Utility Review: Once preliminary design is complete, an interconnection application is submitted to the serving utility. During this stage, utilities review the proposed system to confirm it meets applicable operational requirements and interconnection protocols.
- Technical Studies and Design Validation: Depending on the project, utilities may require certain technical studies and engineering analyses, such as power system impact studies or protection and relay coordination reviews. These studies help verify that the microgrid can operate safely alongside the macrogrid.
- Interconnection Agreement and Commissioning: After the technical requirements are satisfied, the project team and utility finalize the interconnection agreement and testing requirements. The system is then commissioned and tested to confirm safe operation in both grid-connected and islanded modes. Final utility authorization to operate is issued after the required testing and documentation are completed.
Common Utility Requirements for Microgrid Interconnection
Most interconnection processes focus on ensuring safe coordinated system operation, but some requirements vary by utility. Many utilities establish unique interconnection procedures that define important application requirements, testing expectations, and approval milestones for your microgrid project before it can begin operating.
Common considerations include:
- Applicable equipment certifications and compliance, including UL 1741 for relevant inverter-based DERs.
- Export control and unintentional-islanding protection requirements
- Operating modes for energy storage systems
- Telemetry and communications capabilities
- Protection systems and coordination with utility infrastructure
Projects that incorporate multiple distributed energy resources (such as generators, renewable energy systems, battery energy storage, and other on-site energy resources) require careful integration to ensure each asset operates together as a unified system.