'X' is an alliance of 121 countries initiated by India, most of them being sunshine countries, which lie either completely or partly between the Tropic of Cancer and the Tropic of Capricorn. It was conceived as a coalition of solar-resource-rich countries to address their special energy needs. 'X's' aim is to provide a dedicated platform for cooperation among solar-resource-rich countries to help achieve the common goal of increasing the use and quality of solar energy in meeting energy needs of prospective member countries in a safe, convenient, affordable, equitable and sustainable manner. Identify 'X'.