Extrapolate from folklore and anecdotal evidence, and consider the following:

An egg, left overnight on or about the Equinox will spontaneously elevate itself to an upright position by morning.
Also, about the time of the equinox, Eggs left out overnight are occasionally, almost magically, teleported to locations about the house (the E.B. effect).  Brightly coloring the eggs beforehand seems to enhance the phenomenon.

A sketch of the Ovoid Power Unit (OPU):

A dozen or more eggs are hard-boiled, cooled, and decorated with a thick coat of iron oxide, preferably in pretty patterns.
A powerful magnetic field is used to impart a residual magnetism to the oxide layer.
The eggs are placed in a basket filled with a suitable shock-absorbing material.  Green-colored strips of paper seem to work the best.
A cylindrical coil of copper tubing having a large number of turns is placed about the egg-basket, and to its ends are connected a massive capacitor bank, across a spark gap.
When the eggs rise, they induce a current in the coil, which is dumped into the capacitors via the spark gap.  This is the first pulse, and will be fairly small.
The real energy comes from the EB effect, when the eggs are transported at near light velocity out of the coil region to their "hiding places" about the house.
The incredibly rapid change in flux through the coil manifests itself as a giant bolt of energy, which is stored by the capacitor, and used to power a load.

Easter bunny power!