Vietnam’s Ministry of Industry and Trade has reiterated a proposal from last year that power fed into the grid from residential and office-based rooftop solar systems should receive no payment at all – effectively limiting the business model to self-consumption, and making batteries a necessity, one which may become viable there in just a few years more. There are two reasons for this decision – the first being that Vietnam’s grid is struggling with both massive demand growth and (still) the 20 GW glut of solar, mostly rooftop, brought online under generous Feed-in Tariff (FiT) levels in 2019 and 2020. The second reason for zero-payment rooftop solar dispatch is that Vietnam’s coal fleet is not designed for the ramping up…