Assess students' ability to design an optimal mix of rooftop solar PV, battery storage, and energy-efficiency measures to meet a small school's annual energy demand. Scope: sizing PV and battery, estimating upfront cost and annual savings, calculating simple payback and annual carbon reduction, evaluating reliability/resilience (backup hours, critical loads), and comparing trade-offs under budget and performance constraints; requires basic energy-balance calculations, cost–benefit reasoning, and transparent assumptions.