You missed PSCN, NSCN, TUNG, TESC (with tmp 0, it doesn't generate lightning), MERC (tricky to use as it expands and contracts), and NBLE (tends to destroy stuff around it, but you can avoid this with good design). People have also made clever non-electrical wires using LIFE elements, which can be triggered by, and in turn trigger SPRK in, electrical systems.