Of the estimated generation, 346 billion units are expected from coal-based units, as per an assessment done by the power ministry. Domestic coal-based plants are likely to generate 328 billion units in the quarter. Domestic coal requirement for the estimated power is expected to be around 216 million tonnes in the period while blending of imported coal is likely at 13 million tonnes equivalent. Total requirement is 11% higher than Q1 of this fiscal, one of the sources said.