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The Rail Delivery Group (RDG) operates a large AWS estate managed by Colibri. In the wake of the COVID-19 pandemic, reduced passenger numbers and falling ticket revenue meant cost control became a top priority. With existing Reserved Instance (RI) plans nearing expiration, RDG saw an opportunity to reassess their approach and explore AWS's newer Cost Saving Plans to ensure long-term value.
As RDG faced increased financial pressure, avoiding any rise in cloud costs became essential. Their current Reserved Instances were set to expire, and a new, flexible cost optimisation strategy was needed before this deadline to avoid unnecessary spend.
The challenge was made more complex by the shared nature of RDG’s AWS estate, which is used by multiple third-party partners. This made forecasting future usage and planning for growth more difficult.
Colibri designed a strategy based on four key areas:
Consumption analysis: A thorough review of RDG’s AWS usage history helped identify trends and areas where savings could be applied effectively.
Flexibility: A hybrid approach using both Reserved Instances and Cost Saving Plans was proposed to allow cost coverage for predictable workloads while remaining adaptable to change.
Tailored application: Colibri worked closely with AWS financial operations specialists, RDG, and its suppliers to determine the optimal mix of savings tools.
Collaborative planning: Through detailed engagement with all stakeholders, Colibri built a forecast that accounted for expected growth, reductions, and variability across the estate.
The final proposal included several payment options and detailed projections of savings, allowing RDG to make an informed decision.
Colibri’s solution delivered immediate and measurable benefits:
Thanks to this hybrid cost optimisation approach, RDG continues to deliver vital national services while maintaining control over its cloud investment.
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