STANDBY, BACKUP & EMERGENCY POWER
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The hybridisation of emergency infrastructure: Integrating EPSS with DERs By Minx Avrabos I n recent years, the reliability and resilience of emergency power supply systems (EPSS) have become this transformation is the hybridisation of EPSS and DERs, requiring contractors and engineers to master the complexities of true hybrid systems.
When executed properly, hybrid emergency power systems deliver significant benefits. DERs such as solar and batteries can reduce generator runtime, lowering fuel consumption and emissions.
paramount for critical infrastructure such as hospitals, data centres, and municipal facilities. Traditionally, EPSS have relied on centralised backup generators, most commonly diesel-powered, to provide essential electricity during grid outages. However, the rapid evolution of distributed energy resources (DERs), including solar photovoltaics, battery energy storage, and microgrids, is reshaping emergency infrastructure. The core conversation in
Understanding the hybrid approach A hybrid emergency power system is not simply a parallel deployment of generators and DERs. Instead, it integrates centralised backup systems with decentralised energy assets. These systems rely on seamless coordination between conventional generators, renewable sources, and storage, managed by advanced control systems. This hybridisation aims to maximise reliability, optimise fuel use, reduce emissions, and
documentation to satisfy inspection and permitting processes.
provide greater operational flexibility.
Key engineering challenges For contractors, the transition from standalone EPSS to hybridised systems demands a deep understanding of both legacy and modern technologies. Key engineering challenges include: Load prioritisation and switching: Hybrid systems must automatically prioritise critical loads and orchestrate smooth transitions between grid, generator, and DER power, often within seconds. Synchronisation and power quality: Integrating DERs with rotating machines (like diesel gensets) requires precise synchronisation and voltage/frequency regulation to avoid power quality issues. Control integration: Advanced energy management systems (EMS) are essential to coordinate dispatch, monitor system health, and respond to dynamic conditions such as fluctuating renewable output or fuel shortages. Regulatory compliance: Hybrid solutions must meet codes like NFPA 110 and IEEE 1547, requiring careful design and
Benefits of hybridisation When executed properly, hybrid emergency power systems deliver significant benefits. DERs such as solar and batteries can reduce generator runtime, lowering fuel consumption and emissions. Storage assets can provide instant ride-through during transfer events, while renewables can maintain essential loads for extended outages. Moreover, hybrid systems offer future-proofing, enabling facilities to adapt to evolving energy landscapes. Conclusion Hybridising emergency infrastructure is more than a technological upgrade; it is a paradigm shift in how critical facilities ensure resilience. For contractors, mastering the engineering behind true hybrid systems is essential to deliver robust, compliant, and sustainable solutions that meet the demands of a modern, distributed energy world.
MV Grid interconnection & substation strategy: Meeting the backup demands of modern campuses
Traditionally, campus backup power distribution relied heavily on low-voltage (LV) systems (below 1kV), often limited to localised generator sets and uninterruptible power supplies (UPS).
the medium-voltage (MV) range, typically defined as 1kV to 36kV.
By Minx Avrabos C orporate and industrial campuses increasingly rely on dependable power to sustain mission-critical operations and high-tech infrastructure. As these facilities grow, the need for robust backup capacity has surged, prompting contractors and facility engineers to rethink conventional emergency power systems. This shift is reshaping grid interconnection and substation strategies, especially as emergency distribution extends further into
The growing need for MV backup Traditionally, campus backup power distribution relied heavily on low-voltage (LV) systems (below 1kV), often limited to localised generator sets and uninterruptible power supplies (UPS). However, the scale and complexity of modern campuses, such as research parks, data centres, and advanced manufacturing hubs, demand backup solutions that can support entire
sensitive equipment. Grid code compliance: Interconnection schemes must follow local regulations on protection, synchronisation, and islanding. Substation design innovations MV substations serving as emergency distribution hubs are now more modular, scalable, and intelligent. Innovations include: Prefabricated modular substations: These allow rapid deployment and easy scaling as campus needs evolve. Digital substations: Integrating digital sensors and communications improves real-time visibility and remote control. Enhanced protection: Advanced relays and arc-flash protection improve personnel safety and system reliability. Conclusion The push for greater reliability and resilience is transforming how corporate and industrial campuses approach emergency power. By extending backup capacity into the MV domain, organisations can ensure seamless operations, even during grid disturbances. Modern MV grid interconnection and substation strategies are central to this evolution, providing the scalability, flexibility, and intelligence that future- ready campuses require.
buildings or even campus-wide operations. This has led to the adoption of MV emergency distribution, which offers several key advantages: Wider coverage: MV systems can transmit power over longer distances with reduced losses, making them ideal for sprawling campuses. Higher capacity: MV substations and distribution can handle larger loads, accommodating the increased energy requirements of contemporary facilities. Flexible integration: MV infrastructure supports integration with distributed energy resources (DERs) like solar, battery storage, and microgrids, enhancing resilience. Strategic grid interconnection A critical aspect of MV backup deployment is the grid interconnection strategy. Modern substations are designed as nodes that can dynamically switch between utility feeds, on- site generation, and energy storage. This is typically achieved via automated switchgear, real-time monitoring, and advanced protection relays. Key considerations include: Redundancy: Dual or multiple feeders minimise the risk of single-point failures. Fast transfer switching: Automated systems enable seamless transition between grid and backup sources without interrupting
SPARKS ELECTRICAL NEWS
NOVEMBER 2026
NOVEMBER 2026
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