Its a two part tariff, one for the capacity booked and another charge for the electricity consumed. so when they schedule power, the two charges are paid, Fixed charges and Variable charges. When the power is not scheduled due to reasons like low demand etc, then the utilities have to pay for the capacity they have booked.
For Eg 200 MW is being signed as PPA, and the PPA has been signed at a tariff of Rs 4 per unit with FC being 1.5 and VC being Rs 2.5 per unit, if the power is not scheduled then the utility have to pay for the 200 MW capacity of Rs 1.5 per unit
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