A great question about Power Spot

[cyndiepooh]

Not all of them become Power Spots, but approved Wayspots that don’t appear in Pokemon Go do seem to be the first priority for Wayspots.

@NianticThibs

Currently the locations where Power Spots can appear are a combination of unused wayspots and a recently imported new database.

• Unused wayspots: as many of you know, not all the wayspots available on our Niantic Map are used as pokéstops/gyms in Pokemon Go. Those unused wayspots have a chance to host a Power Spot.
• New database: To enhance the density of locations, particularly in areas previously devoid of them, we have recently incorporated a fresh database of locations. Note that those locations were imported while not necessarily abiding to our Wayfarer criterias.

Of the 8 Power Spots I can currently see on my nearby, 6 of them are Ingress-only portals (and I submitted 5 of those.) The other 2 are imports that coincide with labels on Google Maps.

There are three portals that have never been used as a Power Spot that are just outside the 20m circle for an existing Pokestop, so seems to support the 22m requirement. And another accepted Wayspot that is not a portal because it is within the 20m circle of a Pokestop/portal has also never appeared as a Powerspot.