A key insight into agriculture is that the main reason we spread our farms out over massive areas of land is because it is simply more economical. If you think about it from first principles, farming outdoors has major flaws the biggest of which is seasonality. Most crops mature in a handful of months but must be grown only at specific times of the year in order to maximize yield. Doing this out in the open puts you at the mercy of nature. Besides the limited growing season you also have to deal with losses due to weather, pests, competing plants (weeds), and other local conditions like drought or soil quality. The only reason we do it is because it's cheap. It requires less initial cost to set up and less energy input.

If you were to redesign the process you could conceivably build massive greenhouses to control conditions. If you had surplus energy you could also actively heat, cool and light these greenhouses. From a quick look, greenhouse conditions can produce 15 times more yield per acre. They reduce wastage by a comparably large amount as well since half of produce is thrown away due to cosmetic blemishes. They would also drastically reduce the amount of fertilizer and pesticide needed. I think you could drive yields even higher with round the clock lighting, studies as well as practical experience from farmers in northern territories have shown that longer daylight hours allow plants to mature much more rapidly.

An ideal farming setup to me would look like hectares of greenhouses located next to a nuclear power plant that can provide heated water for keeping them warm and cheap power for cooling and lighting.