Copied from Zeitgeist forum
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Ok, so this hasn't really been touched upon yet. We should probably start by making a list of the neccessary utilities, which buildings will be needed, and approximately how many people it will take to run. This last one will be purely an estimate on my part because I don't know about these specifics.
Water/septic: I think collection and recycling can be built into one building quite easily. With the small population we will be dealing with this shouldn't require too much, or too many people to handle. Most of it can, I'm sure, be easily automated and only take a person or two to monitor systems regularly and 2-6 people to occasionally clean out clogged sections of the filters. Chemicals needed for septic systems can be automated, but the occasional cleaning can be a problem (watch Dirty Jobs when he needs to clean one of these out!), but again with the small population won't be as much of a hassle.
Electric: with the dozens of ideas submitted thus far, this should be a very simple utility to deal with. We have ideas of wind farms, personal solar panels, solar roads, piezoelectric panels, and many others that basically just need to be plugged in and work themselves. Repairs will probably be fairly common, which will take a specialized team. The windmills and rodin coil idea would probably take a small power plant to deal with, but nothing too large. Geothermal plants are pretty simple to take care of from what I've read (if this is in our area of development). Even the creation of the solar panels used can be fully automated based on one of the videos posted. All in all (monitoring, building, repairs) I don't see this taking more then 3-4 dozen specialists, most of which only work when things fail. One thing not discussed is if we should have a backup battery system for when weather conditions just aren't fairing. This would be pretty self sustaining, but may be difficult to implement in the grand scale of a city.
Garbage/recycling: This will still require a bit of hands on use I think. It's an extensive process, but we will have to teach each citizen to do their part to make things easier. Every household and public area will require separate sections for trash, glass, plastic/cans, paper and maybe separate for compost as well. Collection of these on a bi-weekly basis (pretty standard in city situations) would take several teams. Depending on the housing structure (apartments vs. single housing style) we could be looking at anywhere from 30-60 people just for collection. This can be minimalized if days and times are staggered properly between sections of the city, but then longer shifts may be required (maybe different teams can switch off every week or two so it's not too monotonous, maybe between occupations or just between collections and plant workers). The plant workers can vary greatly. I've seen a lot of new tech coming out in recycling centers to lessen the load of plant workers, but the vast majority still have assembly lines of people picking out things that shouldn't be in that section before the materials become recycled. This still needs lots of research. Clothes and fabrics can be used as recycled materials and insulation, but this is also in another threat about what buildings would be useful in the city (see Clothes Exchange).
As far as leisure utilities (TV, internet, cell phones, etc.) we will have to, for the time being, rely on outside sources. Unless we have some ability to create our own stand-alone internet service and run everything off of that, we are limited to the rest of society.
Well, these are all I can think of at the moment. Any others I'm missing?