Can I sell surplus solar power to the grid under PM-KUSUM Component C and how am I paid?

Yes, the whole idea of Component C is that a grid connected solar pump can do two jobs: run your pump in the daytime and export the surplus solar units to the DISCOM when you are not pumping. The farmer is meant to earn from those exported units, which is why Component C is often described as turning the farmer into an energy producer. How you are paid depends on the metering arrangement your state and DISCOM use. Under one model a separate meter records the solar units sent to the grid and the DISCOM pays a tariff per unit, sometimes through the existing electricity account as a credit or a payout. Under another model the surplus is adjusted against your own consumption first and only the net surplus is bought. The actual rupees per unit, the metering type, whether it is net or gross, and how often you are paid are all decided by your state regulator and DISCOM, and these numbers vary a lot, so there is no single national rate to quote. Two practical points: the export only happens while there is sun and your pump is idle, so realistic earnings depend on how much daytime surplus you actually have, and the feeder or grid must be able to accept the export, which the DISCOM checks. Confirm the current feed in tariff, the metering model, and the payment cycle with your DISCOM before counting on income from exports.