Gigasun AB (publ), formerly Advanced SolTech Sweden AB (publ), is a Sweden-based solar energy company. The Company finances, owns and operates roof-mounted solar energy installations in China. Through its wholly owned subsidiaries in China, the Company handles sales, procurement, monitoring, administration and management of its solar PV panel installations. The business model of the whole group is to finance, install, own and continuously manage solar PV installations on the roofs of its clients; mainly medium-sized and big private public companies, state-owned companies and organisations such as universities. The Company pays provision for completed transactions and a fixed price for the installation, through their subsidiaries Advanced SolTech Renewable Energy or Longrui Solar Energy.