Hmm, OK.
So, when you go to the Lodge, have you been to the room with the generator yet and found it needs fuel?
As far as I remember, there were 3 things to do before I could move onto the City.
1. Complete the Fence. I had to have Mia build the fence.
2. Learn to Repair Broken Cables. I had to learn how to patch wires with the girls in the evening. You need to repeat this 2-3 times.
3. Repair the Ski-Lift. I had to head deeper into the Forest - this opened the garage, but I think you need to go to the generator at the Lodge first, to find the generator has no fuel, then you get the quest to gain some & I believe that is when the garage opens.
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When you get to the Lodge, you'll see this:
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The basement is where the generator is.