Final answer:
The power plant can produce 21,600 MWh of energy in 1 day.
Step-by-step explanation:
The capacity of the power plant is 1000 MW, and its capacity factor is 0.9. To calculate the energy produced in 1 day, we can multiply the capacity of the power plant by the capacity factor and then convert it from MW to MWh.
So, Energy produced in 1 day = Capacity of power plant × Capacity factor × 24 hours = 1000 MW × 0.9 × 24 hours = 21,600 MWh