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In the UK power sector, substation reliability, space optimisation, and long-term maintenance cost play a major role in selecting the right technology. Two of the most widely used options are Gas Insulated Substations (GIS)  and Air Insulated Substations (AIS) . Both have their own benefits, and the best choice depends on project requirements. 🔹 What is an AIS Substation? AIS (Air Insulated Substation) uses open-air insulation between components. Best for: Large open areas,