The issue is almost certainly related to how the primaries are being pulled to feed the site. They're either tapping off an existing transformer that feeds the shopping center, or running new service through an existing conduit to that transformer and then making the connection (all guesswork on my part). They may need to negotiate with the tenant to cut power to complete the work. This is in contrast to typical delays where they just need to get one or more crews in to connect service to a new or existing pole.