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SSE Airtricity is one of the three largest energy suppliers across the island of Ireland, serving around 750,000 customers with electricity and gas. The company built the ESI Energy Advisor entirely in-house on Databricks, using Claude Sonnet 4.5 to deliver personalized, actionable energy-saving advice to over 65,000 smart meter customers. Within the first month of launch, 90% of logged-in customers engaged with their personalized insights section, and the site saw a 12% jump in unique visitors.