In this study, the concentrations of primordial radioactive nuclides 226Ra, 232Th, and 40K and their potential for causing radiological health hazards were measured using coaxial high-purity germanium (HPGe) gamma detector in coal, bottom, and fly ashes collected from the 120 MW Van Eck thermal power plant, Windhoek, Namibia. The experimental results showed that for coal samples, the activities of 226Ra, 232Th, and 40K were 20.22 ± 3.82 Bq/kg, 26.70 ± 5.90 Bq/kg, and 30.36 ± 6.36 Bq/kg, respectively. For the bottom ash layer samples, the activities of 226Ra, 232Th, and 40K were 88.89 ± 11.91 Bq/kg, 113.28 ± 15.44 Bq/kg, and 97.84 ± 16.55 Bq/kg, respectively whereas for the fly ash the values are 59.18 ± 4.55 Bq/kg, 77.00 ± 5.89 Bq/kg and 77.17 ± 7.30 Bq/kg, respectively. The activity concentration of 226Ra, 232Th, and 40K were all enhanced in the bottom and fly ash relative to coal samples. However, the estimated radiological health hazards and the concentration of the various samples from the selected location were within the permissible limits provided for human safety and environmental protection. Keywords: Radioactivity, coal, ashes, radiological hazard indices, thermal power plant, HPGe detector, excess lifetime cancer risk.