While not a PO movie specifically,
City of Ember does portray a future underground society (implies a nuclear war occurred) fully dependent on a power source (The Generator) that begins to show signs of failing. The emotions and responses range the PO gamut;
Cornucopian:
- "We'll just fix it"
- "There is no other solution"
- "The 'Builders' will come back and fix it"
- "Going anywhere else is not an option"
- "It must work, this is all we've known"
Those wanting change:
- "The Generator is rapidly breaking down"
- "We have to find a way out of here"
There are corrupt officials that have their own temporary escape plans, those who believe the human Builders will return after 200 years, the vast majority of the ill-informed population alarmed at the rolling blackouts (up to 7 seconds), and then a small number who have sought a way out of their grimy, falling-apart subterranean city.
The story further parallels PO by noting efforts by others in the past that made some headway, but were abandoned due to government derailment. The ending is promising, though leaves much unsaid (which might foreshadow a sequel, though the plot would be completely different).
This is a family movie, and since it parallels PO fairly closely without mentioning oil once, would be a good movie to take one's family to, as the events and solutions set the stage for a close PO metaphor. Especially good for those not yet aware of the details of PO. There's very little violence, and I don't remember any foul language. Our kids (10 and 12) looked at it like a sci-fi adventure movie, and they enjoyed discussing various ramifications and 'what ifs' afterward.