[en] Energy generation by solar PV (photovoltaic) systems can be improved by incorporating tracking mechanisms, with the highest improvements resulting from 2-axis tracking. Peak energy generation levels (from PV collectors with 2-axis tracking) have been determined in this study, for locations in Nigeria. The spatial domain of interest was discretized into a grid of 1° latitude by 1° longitude cells. For each cell, monthly average daily irradiation on horizontal surfaces and ambient temperatures were obtained from the web-based NASA meteorological data service. With these, irradiation on tilted surfaces, system performance ratios, r_p, seasonal and annual energy generation potentials, E/P_k, and improvements in energy generation potentials, ΔE/P_k, were determined. An approach for estimating r_p is suggested, which accounts for effects of varying temperature and insolation levels on performance. r_p values obtained by this approach are conservative relative to the fixed value of 0.75 which is presently in common use. The highest seasonal E/P_k (446–648 kWh/kWp) and ΔE/P_k (32%–62%) occur in the December-January-February season, and the least (249–590 kWh/kWp and 10%–26%, respectively) in the June-July-August season. E/P_k generally increased with latitudes. The additional E/P_k obtained with tracking (20%–40% annually) could offset additional costs due to tracking. - Highlights: • Energy generation estimates for solar PV systems with 2-axis tracking are presented. • System performance ratios at 5 sites, obtained with 3 different models are compared. • Energy generation potentials, E/P-k, are determined for Nigerian locations. • Gains in E/P-k compared to the outputs of non-tracking collectors are also obtained. • Highest E/P-k are obtained in the DJF season and at high latitude locations.