Can you store energy in an inductor and use it later?
The magnetic field which stores the energy is a function of the current through the inductor: no current, no field, no energy. You'll need an active circuit to keep that current flowing, once you cut the current the inductor will release the magnetic field's energy also as a current, and the inductor becomes a current source (whereas its dual, the capacitor is a voltage source).

Aspects of the capacitor-inductor duality in energy storage terms:  

\begin{array}{ll}
\mbox{Capacitor} &amp; \mbox{Inductor} \\
\mbox{* stores energy in electric field} &amp; \mbox{* stores energy in magnetic field} \\
\mbox{* must be open loop (infinite resistance) } &amp; \mbox{* must be closed loop (zero resistance)} \\
\mbox{* loses energy through parallel resistance} &amp; \mbox{* loses energy through series resistance} \end{array}

A superconductor can sustain a magnetic field in a zero resistance current loop, however.



Unfortunately you'll always see the fumes of water vapor caused by the liquid nitrogen in pictures like this, which means temperatures below -183 °C.