LONGi, a China-based solar module manufacturer, has been evaluated by the Institut Photovoltaïque d’Île-de-France (IPVF) in a comparative study of two 50 MW ground-mounted PV projects in France and Denmark. IPVF compared LONGi’s Hi-MO 9 back-contact (BC) modules, measuring 2,382 × 1,134 mm, with similarly sized mainstream TOPCon modules. Hi-MO 9 has delivered 1.84% higher per-watt generation and 3.32% lower levelized cost of electricity (LCOE) despite being priced $0.01/W higher. In France, it recorded first-year equivalent generation of 1,210 and 1,639 hours versus TOPCon’s 1,187 and 1,611 hours, while in Denmark, gains were 21 and 20 hours respectively. According to LONGi, the advantage was linked to LONGi’s HPBC 2.0 design with a grid-line-free front, improved low-light performance, and durability in high-temperature, humid conditions. Earlier tests by Enertis Applus+ and other institutions had also favored BC technology.