Electric Smelter

Lore & Background

In the early days of the alien invasion, the player's makeshift workshop relied on Stone Furnaces belching black smoke over the forest floor. Every plate of iron was a small negotiation with a coal stack, and every copper wire demanded a careful pour of fuel. The discovery of the Electric Smelting blueprint changed that calculus entirely. Suddenly the smelters could sit in long, silent rows, their only output a faint blue shimmer along the connecting poles, and the air above the factory stayed clear. The Electric Smelter occupies a specific place in the factory's evolution. It is the bridge between the fuel-burning era and the fully electrified one. Players who remember their first row of smelters running without a single coal item in the input slot often describe the feeling as the factory finally breathing. The alien spawners still circle overhead, the biters still crawl from the dirt, but the ground below is no longer choked with soot. As the factory matures, the Electric Smelter becomes almost invisible—just another blue box in a sea of identical machines, fed by a mining drill on one side and an assembler on the other, its only visible sign of work the occasional flicker of current along the electric pole. It is unglamorous, essential, and quietly the reason the whole machine keeps turning.

In Their Own Story

The forest was quiet except for the low, steady thrum of the electric poles. Mara crouched beside the newest row of Electric Smelters, watching the blue arcs dance between the copper terminals. No smoke. No clatter of fuel being shoveled in. Just the soft *tick-tick-tick* of iron plates dropping into the output slot, two per second, perfectly even. She pressed her thumb against the warm housing of the nearest smelter. The alien spawners had been quiet for three days now—maybe they were regrouping, maybe they were simply out of range. Either way, the factory had to keep growing. She pulled up the schematic on her tablet: forty more smelters, two additional mining drills for the iron deposit, a new substation to feed the eastern row. "Alright," she muttered, tapping the build queue. "Let's see how far the current carries us."

Above, a spawner's shadow passed over the treetops. Below, the smelters kept ticking, patient and electric, turning the world's raw bones into the bones of a machine that might, just might, be enough.

Reader's Guide

Inputs: Iron ore and/or Copper ore (from mining drills), plus 10 energy per item drawn from the electric grid. Output: Iron plates or Copper plates, one every 2 seconds per smelter. Required setup: an Electric Smelter placed adjacent to an Electric Pole, with the pole connected to a power source (solar panels, wind turbines, or a nuclear reactor chain). Upstream dependencies: Mining drills + conveyors or inserters feeding ore into the smelter; a functioning power grid with sufficient capacity. Downstream: Iron plates feed the Steel Furnace, assemblers (for circuits, processing units, etc.), and construction of further machines. Copper plates feed Copper Wire, which feeds Electronic Circuits and Processing Units. Optimal ratio: For a balanced plate line, match smelter count to your plate demand. A common early-mid benchmark is 1 mining drill (iron) feeding 4–6 Electric Smelters, with a matching copper line. Scaling the factory means scaling the grid in lockstep. As the factory grows, the Electric Smelter chain scales linearly: more drills, more smelters, more power. The key insight is that unlike fuel smelters, there is no fuel logistics chain to manage, so the only scaling constraint is electricity and ore throughput. Nuclear power removes the energy ceiling almost entirely, leaving ore mining as the sole growth lever.

Did You Know?

• The Electric Smelter produces zero pollution, meaning it does not trigger the alien spawner penalty that fuel-burning furnaces do, making it strategically important for keeping the factory defensible.
• Because it has no fuel input, the Electric Smelter's only input is the ore itself, simplifying logistics compared to Stone or Steel Furnaces which require a second input stream.
• The Electric Smelter is one of the few machines in Factorio that can be placed directly next to an Electric Pole without needing a separate power pole in between, as long as the pole is within connection range.
• In large factories, the hum of hundreds of Electric Smelters drawing power simultaneously can cause noticeable voltage drops if the grid topology is poorly designed, making pole placement and substation layout a real eng