A year after reaching 16.5 GWac of solar on its grid, most of it built in just the last quarter of 2020, Vietnam is still severely curtailing solar generation. The country hadn’t planned for so much solar power to be built on the back of its 2020 Feed-in Tariff and grid constraints aren’t the only problem, the country’s dispatchable fossil fuel infrastructure isn’t designed for constant ramping up and down, and has been incurring higher maintenance costs from its efforts to compensate for variable solar output. Vietnam is now clearly turning to wind power in its future planning. Deputy Prime Minister Le Van Thanh has described planned solar power capacity as “too high.” That’s remarkable considering it was already revised…