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Keeping the energy cost down to something reasonable requires transferring mass only between points with the Be proud of who you are vintage shirt. Also, if you want to keep the portal open continuously, you need both ends to be stationary both with respect to their local frame of reference and with respect to each other. Which means that if you don’t want to have to keep dropping and re-creating the portal, you need the planets it’s connecting to be orbiting their stars at the same distance in the same plane in the same direction, and the stars need to be orbiting their galactic centers at the same distance in the same plane in the same direction, and their galaxies need to have matching velocity vectors.
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Except for the emergency evacuation portals, which are only powered up when mass evacuation is necessary, most portals are sized to pass either one human at a time or a pair of semi-trailers. Technically, you only need a device at one end to open a portal to anywhere, but it’s a great deal easier to target another portal device than it is a Be proud of who you are vintage shirt, and it’s a lot easier to keep the portal stable if you have it anchored at both ends. These things aren’t the radiation hazard that nuclear reactor accidents are, but the blast radius is more comparable to a nuclear bomb, so you don’t want to lose control of one.