Electrum - Tesla Coil in New Zealand - Known as Electrum, this four-story (38-foot) Tesla coil was commissioned by a prominent New Zealand art patron, Alan Gibbs, and set up on his farm outside of Auckland in April of 1998. Built by the late artist Eric Orr and high-voltage engineer Greg Leyh, the enormous coil puts out over 3 million volts, enough to rip electrons out of the air molecules around it.