Solar energy often appears a resource without a history, perpetually novel and promising futuristic abundance. This overlooks a long episode of ‘low-modernist’ solar research in and for the global South. Focusing especially on India and detouring through Mexico, two important arenas for early solar experimentation, this article traces an alternative history of solar technologies as austere everyday fixes for developing countries. In parallel with the well-known postcolonial focus on high-modernist energy mega-projects, the narrow transnational community of solar experts retained a competing tendency to think small. At its heart lay a dualistic conception of the modern energy economy: flexible and resource-intensive grid electricity for urban centres, inferior off-grid devices to meet the minimal and static needs of the rural poor. This impoverished, feminized Third World projected user base resulted in persistent underinvestment and failed commercialization, helping to explain why solar technologies did not take off earlier. While solar experts emphasized the regional exceptionalism of the arid tropics, the teleological linkage between modernity and ever-rising energy abundance was rejuvenated from below as rural communities began to imagine the high-energy good life as a universal aspiration.