One monofacial and one bifacial string of PV modules were installed over white and concrete ground surfaces, and their performance was monitored for 2.5 years. During the entire study, the PV systems and ground surface were maintained under natural conditions without human intervention (e.g., cleaning or washing). A higher rear irradiance is observed for a white surface than for a concrete surface. Additional solar irradiance results in greater power generation, and hence, greater bifacial gain. Bifacial gains of 4–15 and 4–22% are observed on concrete and white surfaces, respectively. Over 50% relative extra albedo and over 25% power generation are demonstrated on the white ground surface compared to the concrete surface, particularly in summer. The levelized cost of electricity (LCOE) of the bifacial PV modules installed on the white surface is lower than that of similar modules installed on concrete, and we predict that in nine years, the LCOE of bifacial PV modules will be lower than that of their monofacial counterparts. These PV systems were monitored for a long period of time; hence, we believe that this work provides reliable information for energy researchers and industry.