30% cheaper AC technique

This is excellent. An air conditioning unit that cools refrigerant using ice water built up during the night. These AC units can reduce peak draw during the hottest days by running at night. They also save energy by not having to work as hard to quickly pump out cold air when turned on. This measures two major advances. Lower wattage AC, and lower peak urban wattage during hot days in cities.

This will also slightly reduce and moderate urban temperatures by reducing the amount of heat exchanged into the city's out-of-doors during the daytime. I could expect overall urban temperature in a metro region to be reduced by an aggressively estimated 3*F from less AC use.

It is also basically less expensive to use energy generated at night, because there is significantly less demand for it. Some businesses charge up supercapacitors full of power at 3AM and sell it for a modest profit at 3PM when the prices are higher. You pay for this without realizing it or negotiating for it. Now you may pay less. Now everyone may pay less.