Long distance transmission creates enormous power wastage, and cities are rarely located in places ideal for large scale wind and solar. Fusion can help deliver power to urban centres, reducing the acreage needed for a solar farm.

A fusion plant will need either nearby solar or nearby fusion plant, with solar only ok if restarting it can wait until daytime. More likely than not, a fusion plant is needed to help regulate plasma temperature based on reaction rate, and cool magnets. But a 10gw fusion plant still is extremely unlikey to need its output overnight compared to day peak demand. A fusion plant needs to be located near a low property value power plant, instead of close to high property value customers.