How much would it cost for bandwidth for municipal fiber network with 1,000 households?

I have an opportunity to get involved in a municipal broadband project in a management (non-technical) role. The physical infrastructure is all owned by the local government and the fiber backhaul terminates at a local POP where there's a lot providers to choose from. I have enough experience to ballpark a lot of the operational expenses but have never done capacity planning or negotiated a bandwidth contract.

There's approximately 1,000 subscribers, evenly split between 25/25mb, 100/100mb, and 1000/1000mb service plans. They're almost all single family residences (no dorms, businesses, etc). Would anyone be able to estimate what might be the total bandwidth requirements? And what would be a typical monthly costs? Thanks!