EA-MiniGrid-Bench is an open, ML-ready tabular benchmark dataset for solar mini-grid viability assessment across Rwanda, Kenya, Uganda, and Tanzania. It comprises 175,253 validated grid-cell records at 2–3 km resolution, encoding mean Global Horizontal Irradiance (GHI), population count, and road proximity, enriched with country and two levels of administrative labels and per-cell coordinates. Derived from the Global Solar Atlas, WorldPop 2025, OpenStreetMap, and open administrative boundaries via a reproducible Python pipeline. Released with the complete processing and experiment code.