A leading Japanese retail bank partnered with VSI Technologies to embed sustainability into its digital core and branch operations. VSI conducted a Sustainability Maturity Assessment, mapping IT, facilities and operations to ESG targets. We then implemented a Green
Ops framework that schedules data-center workloads to renewable-energy windows, optimizes branch HVAC with Io
T-driven controls, and integrates carbon-footprint metrics into the bank's customer portal. For core banking, we refactored batch-processing jobs into microservices, reducing overnight compute emissions by 28 %. In branches, smart-lighting and occupancy sensors cut power use 22 %, while digital forms and e-sign reduced paper volume 85 %. The bank also launched a "Green Loan" product using VSI's Open Finance Fabric, offering preferential rates tied to verified CO2 reductions. As a result, the bank achieved its mid-term ESG targets one year ahead of schedule and improved its climate-risk score in national sustainability rankings. This case study illustrates how embedding sustainability into digital transformation can deliver both environmental impact and competitive differentiation.
