Isn't the infinite free energy one not technically correct unless the portals also move relative to both the sun and the earth in very sophisticated ways? I believe that if it was only fixed to the earth's orbit and rotation as to appear 1 meter above the ground that any energy produced by using the gravity of earth would necessarily move the planet towards the portals, which would require you to either recreate the portals every so often (meaning the energy was not infinite), or calibrate your portals fixed locations to keep the planet in a stable orbit while also keeping your falling object in a stable infinite cycle