MICROGRID COMMITTEE How the Big Beautiful Bill is Reshaping the Future of Distributed Energy and Microgrids
can interconnect PV and storage using internal Microgrid Intercon- nection Devices (MIDs) or metered switches that disconnect from the main service. However, commercial and industrial applications are more complex. The Commercial and Industrial Challenge Commercial and industrial microgrids typically serve three-phase power applications for mission-critical facil- ities, where reliable emergency or backup power is essential. These sys- tems often require a combination of components—PV panels, inverters, energy storage, power conversion systems (PCS), energy management systems (EMS), Interconnection De- vices, switchgear, transformers, and more. Rarely does a single manu- facturer provide all these elements, making integration a significant chal- lenge. Despite this complexity, integrating onsite renewables can be straightfor- ward—if the right products are spec- ified from the outset. A UL 3008 Listed Automatic Inter- connection Device is not just a con- venience—it’s a necessity for mod- ern microgrid projects. These devic- es offer three critical advantages: • A UL Listed Microgrid Intercon- nection Switch • A preprogrammed controller • A factory-built and tested assem- bly For example, most utilities require an interconnection agreement as part of their process, which means all prod- ucts must demonstrate their intend- Why UL 3008 Listing Is Essential
ed purpose and provide proof that ev- ery device has been properly tested and approved. This step can signifi- cantly impact a project’s schedule— having a UL listed device can greatly streamline utility approval and reduce delays. The main challenge comes when sourcing interconnection switches. Most Microgrid Interconnection De- vices (MIDs) available today are cus- tom-assembled solutions, typically combining protective relays and con- tactors with uninterruptible power supplies (UPS). These configurations are usually not UL Listed, so they re- quire third-party testing for utility ap- proval. This process can take weeks, requires specialized labor, and can often lead to project delays. Most importantly, these custom MIDs are not rated for emergency use. When clients invest in onsite mi- crogrid, it’s only reasonable to expect equipment that is certified for intend- ed application. For too long, microg- rids have been assembled with little scrutiny regarding their application or listed ratings. This approach introduc- es unnecessary risk and uncertainty for developers, installers, and end users. Conclusion As DER adoption accelerates and microgrids become more prevalent, the need for standardized, listed in- terconnection devices is undeniable. Choosing a UL 3008 Listed Automat- ic Interconnection Device stream- lines design, utility approvals, and commissioning—ensuring compli- ance, reliability, and true emergency readiness. By prioritizing listed solu- tions, our industry can deliver safer, more resilient microgrid systems that are ready to meet both today’s and tomorrow’s energy challenges. l
Benny Benavidez Chair, Microgrid and Renewables Committee ASCO Power Technologies T he integration of Distributed En- ergy Resources (DERs) into mi- crogrids is reshaping the electrical landscape. According to the National Electric Code (NEC) Article 705, mi- crogrid interconnection equipment must be listed for emergency use— ensuring that emergency systems can be safely isolated from nonemer- gency loads when the main power supply is interrupted. Why Microgrids Matter Microgrids have become increasingly important in supporting the energy transition and meeting the surging power demands driven by AI, electri- fication, and new technologies. Over the past decade, the deployment of photovoltaic (PV) and battery energy storage systems (BESS) has accel- erated, especially in states like Cali- fornia. Here, progressive codes and rising utility rates have made onsite renewable power generation a prac- tical and often necessary solution for both commercial and residential cus- tomers. At the residential level, solar and en- ergy storage systems are now wide- ly available. Most electrical installers
18 | Winter 2025 POWERLINE
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