Transformers, substations + the grid
Digital substations – modernising the grid As Africa’s energy systems face mounting pressure from increasing urbanisation, ageing infrastructure and the accelerating shi towards renewable energy, utilities are being challenged to do more with less and to do it faster. In this context, digital substations are emerging as a critical enabler of grid resilience and modernisation.
T raditionally, substations have relied on extensive cop- per wiring, manual monitoring, and reactive mainte- nance. However, the demands of today’s energy land- scape, characterised by decentralised generation, fluctuating loads and increasing electrification, require a fundamentally dierent approach. Digital substations represent a key step in that shi£. From infrastructure to intelligence In digital substations conventional point-to-point copper connec- tions are replaced by fibre-optic communications networks, ena- bling real-time data exchange across the grid. This transition allows utilities to move from static infrastructure to dynamic, data-driven systems that can respond instantly to changing conditions. By integrating advanced sensors, automation systems and cloud-enabled analytics, operators gain access to up-to-the- moment information, allowing for faster, better-informed decision- making. Mohamed Hosseiny, Oversight Country Managing Director for Africa at Hitachi Energy, explains. “Digital substations change how utilities see and manage their networks. Instead of reacting to faults a£er they occur, operators can anticipate issues, optimise perfor- mance and improve reliability in real time.” Enabling renewables integration and grid stability A major challenge facing African utilities is the integration of renew- able energy sources. Solar and wind energy oer significant oppor- tunities, but their intermittent nature introduces vola- tility into the grid.
In addition, continuous monitoring and predictive maintenance capa- bilities help utilities reduce downtime, extend asset lifecycles, and improve service reliability. A leap forward for Africa For many African countries, the transition to digital substations presents an opportunity to leapfrog legacy infrastructure and adopt future-ready sys- tems from the outset. With more than 20 years of substation communication experience and hundreds of thousands of control and protection systems deployed globally, Hitachi Energy brings to the sector the expertise and the proven technology needed to support this transformation. “Africa has an opportunity to build smarter grids from the ground up,” notes Hosseiny. “Digital substations are a foundation for long-term energy security, sustainability and economic growth.” The future grid As utilities across the continent navigate the pressures to expand access and improve reliability, there is a clear need for intelligent, adaptable infrastruc- ture. Digital substations oer a path forward, enabling utilities to move be- yond traditional limitations and build grids that are more resilient and ready for the demands of a rapidly evolving energy future.
For more information visit: www.hitachienergy.com
Digital substations play a crucial role in managing this complexity. By improving data quality and reduc- ing decision-making time during disturbances, they enable utilities to maintain stability even as energy inputs fluctuate. Incorporating renewable power into the grid is an essential aspect of the energy transition and util- ities need to ensure the grid can handle that transi- tion. Digital substations provide the visibility and control needed to balance supply and demand in increasingly complex systems. Eiciency, safety and cost savings Beyond performance improvements, digital sub- stations deliver wider operational benefits. The reduction in physical cabling significantly lowers installation and maintenance costs, as well as decreasing the overall footprint of substations, a particular advantage in space-constrained urban environments. Safety is also enhanced. By removing tradition- al electrical connections between high-voltage equipment and control systems, digital substa- tions reduce the electrical hazards for personnel.
Operators use real-time data to optimise performance and reduce downtime.
JUNE 2026 Electricity + Control
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