Towards Adaptive Solar Tilt Control at High Latitudes

Solar power is growing rapidly in Finland and other high-latitude regions. However, at high latitudes, solar plants face extreme conditions including low sun angles and mostly diffuse light. Adaptive tilt-steering could improve energy over fixed panel positions, but choosing the best approach requires understanding the complex relationship between physical snow/irradiance models and controller choices. We propose a four-part plan: (1) validate a physics-based snow/irradiance model against long-term measurements from three sites, comparing 20° and 90° panel orientations; (2) build multiple plausible irradiance/snow models to capture uncertainty rather than assume it away; (3) evaluate a range of controllers, comparing advanced ML and RL-based methods against static rules, domain heuristics, and ensembles; and (4) derive practical hardware and software design guidelines from the results. Our early experiments on data from Finnish sites showed adaptive snow-aware control adding single- to low-double-digit percentage gains over fixed tilt, and physics-guided controllers transferring to new sites without recalibration. These results motivate a comprehensive assessment of adaptive tilt control at high latitudes.