A prominent housing developer plans construction of a small low-carbon-emitting city in an equatorial nation. The developer plans to maximize renewable energy use and estimates daily city summer solar energy generation capacity and load (total electricity demand), in megawatts (MW):

The developer estimates the following for capacity and load:

At 14:00 solar generation is highest at 720 MW

At 20:00 solar generation decreases to 0 MW

At 20:00 load is highest at 980 MW

At 4:00 load is lowest at 380 MW

How should the developer meet additional energy demand while achieving the lowest-carbon-emission goal option?