Electricity

"After Industry, newly founded highland and badland rooms may contain finite lodestone; legacy lands are not backfilled. Mine-lodestone takes 8 seconds per unit and wears a pick once per unit. A retained 100-use matching-quality lodestone magnetizes each field magnet made from 2 steel at a forge; it is worn once, not consumed as mass. Insulated windings use 1 copper-wire, 1 cloth and 1 glass at a machine workshop. A steam dynamo requires 12 steel, 4 gears, 2 shafts, 4 bearings, 4 standard parts, 4 insulated windings, 2 field magnets and 4 glass, all quality 4 or better while its first building may be quality 1, and must share a room with a usable steam shop and lighthouse. Run-electric-beacon reserves 2 matching-quality charcoal and one exact matching-quality filled bucket for a staffed 120-second run; electricity exists only while started <= now < ends and all three captured buildings remain usable. Completion returns the bucket worn once and wears each unchanged captured building one point, never a replacement. Interrupted runs consume committed fuel and water, return the worn empty bucket and give no credit. Four completed quality-4+ runs after Industry unlock Electricity. An active electric beacon is visible at most two accessible physical region-contact edges away; it exposes only the existing sanitized beacon record and never crosses an inaccessible region. Ordinary charcoal lighthouse lighting remains independent."