There would also almost certainly be some on-going costs. The Lagrange points aren’t fully stable, so eventually we’d need to ship up propellant for station keeping. [EDIT]: We could likely use solar radiation for station keeping… Probably on much longer timescales mirrors would need to be replaced. These costs would probably be less than 1% of the upfront investment, but if the system gradually falls apart, you then find yourself in a bad situation.
There would also almost certainly be some on-going costs. The Lagrange points aren’t fully stable, so eventually we’d need to ship up propellant for station keeping. [EDIT]: We could likely use solar radiation for station keeping… Probably on much longer timescales mirrors would need to be replaced. These costs would probably be less than 1% of the upfront investment, but if the system gradually falls apart, you then find yourself in a bad situation.