# If we make a "Ring around the earth" in orbit - a wire ring in orbit - could we use it generate electricity?

I envision a conductive wire that is extruded out of a satellite as it completes it orbit, and then goes past it's start point a bit before stopping the extrusion. Then the satellite is sent to grab both ends and connect them into a complete wire ring around the earth, let's say in the altitude range of geostationary satellites. Could do this many times and create a cable. This ring is moving faster than the earth rotates, maybe several times faster. If you then put a satellite in geostationary orbit that can put a wire loop around this earth-ring, couldn't this generate electricity to be sent to earth?

• A constant magnetic field vertical to a coil does not generate alternating electric current.
– Uwe
Commented Mar 26, 2018 at 22:28
• Also, do a rough calculation how much metal you need for that ring. Remember that, no matter whether this works or bit, for this to pay off even hypothetically, you'd need to compensate for the earthbound transmission losses, meaning that you need a lot of power to be transported by that ring. Now imagine you instead of putting the energy into refining that metal, and then getting it into space from earth potential, you just used the same energy to convert deserts into greenhouses with turbines. You're welcome.
– user17550
Commented Mar 27, 2018 at 2:06
• To paraphrase Larry Niven: "The ring-wire is unstable!" Commented Mar 27, 2018 at 5:55
• A ring around earth on its surface would do, there is no need to put it in orbit. But there will be induced current only when the magnetic field of Earth changes.
– Uwe
Commented Mar 27, 2018 at 8:21
• how would the "extruding a wire" work? are you considering something like a millimetre a second so it stays roughly in the same orbit?
– user20636
Commented Mar 27, 2018 at 13:30