A well established electrical company is installing a subpanel a significant distance from our main service. They sent two quotes indicating they could use either 3/0 Aluminum or 1/0 Copper feeder and either would be adequate for the requirements. The quote for the Aluminum was significantly cheaper. I asked why anyone would choose copper, and he said that he just "prefers copper", and did not provide any additional details. Before I tell them to go ahead with the aluminum, is there any additional considerations I should be aware of?
Ideas: Maybe aluminum doesn't last as long or breaks down over time, or has long term problems. I see heavy gauge aluminum on telephone poles so I can't imagine this is the case. I would guess that copper would also be more prone to theft.
Maybe I just "prefer saving money" for this project.