For your camera and many of Nikon's current and past point-and-shoot models, the Nikon EH-62F will do the trick. Many other brands offer similar accessories for at least some of their models.
When the adapter offered has a plastic lump to replace the battery, it means the camera can't be powered using the USB port (if it has one) for anything except charging the battery, and many cameras don't even allow that.
I have a Panasonic ZS20 that has a similar arrangement: you buy the AC power supply which has a standard male coax connector on it, and a battery lump that pops into the camera and has a cord with a matching female connector on it. I don't have the power supply handy, but I think it makes 8 or 9 VDC and I'm pretty sure the battery output is 3.6. Mine would be easy to drive from a 5 VDC source with an adjustable DC-to-DC converter like this one.
The connector on the Nikon adapter looks proprietary, and I have no idea what voltage it supplies.