Data Desk

The Fuel-Switch Window Is Open, and It Swings Toward Gas

Industrial natural gas has spent five years getting cheaper while industrial electricity climbed, and the ratio between the two prices is now the most lopsided in the measured window. Here is the arithmetic for deciding which meter should carry your heat, and what to do before the window moves.

Somewhere in nearly every plant sits a piece of equipment that could run on either meter: a dual-fuel boiler, a drying oven electrified in a different price era, a heat-treat line specced both ways and left on whatever fuel was cheap at commissioning. For five years the two meters have been walking apart. Industrial natural gas fell 36.9% between year-end 2021 and the latest monthly reading, from $6.77 to $4.27 per thousand cubic feet, and the current print is $4.27/Mcf as of May 2026, down 9.0% from a year ago, according to the Energy Information Administration. Industrial electricity went the other way, and now runs 8.7¢/kWh as of May 2026, up 5.1% from a year ago. The number that decides which meter should be doing the work, the ratio between the two prices, is the most lopsided it has been in the window the data covers.

The ratio that decides which meter runs

Divide the industrial gas price by the industrial electricity price, month by month, and you get a single dial for the fuel-switch decision. When the overlapping window opens in March 2021, the ratio reads 0.632. Across the full window it averages 0.662. As of May 2026 it reads 0.490, the widest gap between the two fuels in the measured window. The units are deliberately mismatched, dollars per thousand cubic feet over cents per kilowatt-hour, so the level means nothing on its own. Its history is what gives it meaning. Below the average, gas is cheap relative to power. This far below, a plant that can choose its fuel is effectively being paid to choose.

Gas-to-power price ratio, May 2026: 0.490. Industrial gas ($4.27/Mcf) divided by industrial electricity (8.7¢/kWh). The ratio opened at 0.632 in March 2021, has averaged 0.662 across the window, and reached 0.490 in May 2026. A lower ratio means gas is cheaper relative to power.

The electricity line in this pair is the EIA's average delivered price to industrial customers, generation plus transmission and distribution, blended nationally. The gas line is the average price industrial buyers actually pay, in dollars per thousand cubic feet. Both are monthly, and both are delivered prices rather than spot quotes, which is what makes the ratio a fair fight: it compares what the two meters invoice, not what traders think the molecules and electrons are worth.

A Btu is a Btu, until you price it

Put both meters on one yardstick and the gap stops being abstract. Pipeline gas carries about 1.037 million Btu per thousand cubic feet, and a kilowatt-hour contains 3,412 Btu, so the conversion is mechanical, and the arithmetic below is done in code, not by feel. At $4.27/Mcf, heat at the gas meter costs $4.12 per million Btu. At 8.7¢/kWh, the same million Btu drawn through the electrical service costs $25.53, about 6.2 times as much before any burner, element, or line loss enters the conversation.

Now run it through a real load. Take a process-heat duty of 10,000 million Btu of delivered heat a year, a mid-size heat-treat cell or a modest steam boiler. Fired on gas at 80% combustion efficiency, with the balance lost up the stack, the annual fuel bill at the current price comes to about $51,471. Deliver the identical heat through electric resistance, crediting the elements with converting every Btu they draw, and the bill is about $255,275. The difference, $203,804 a year on a single load, is the fuel-switch window expressed in dollars. Heat pumps can rewrite that arithmetic for low-temperature duties, because they move more heat than the energy they consume. For the high-temperature work that fills a machine shop, a foundry, or a heat-treat department, resistance is the honest electric comparison, and the gap stands.

The ratio is not a forecast. It is a standing invoice for every dual-fuel asset running on the wrong meter.

Where the window came from

The cheap side of this trade was not always cheap. Industrial gas hit $9.62 in September 2022, the high of the archive, then gave nearly all of it back, bottoming at $3.22 in August 2024. The current price sits at the 16th percentile of an archive that begins in March 2021, 55.6% below that high. Electricity never made the round trip. Industrial power rates ratcheted up through the same window and did not come back down, which is why the ratio between the two, rather than either price alone, is the honest way to see the divergence.

Two caveats belong in print. First, the window is measured, not promised. The archive behind every claim here opens in March 2021, so the widest gap means the widest in a five-year archive that already contains one violent spike, not the widest in history. Gas has been the volatile leg of this pair, and a ratio built on a volatile numerator can close faster than a capital project can. Second, the ratio prices energy and nothing else. It knows nothing of demand charges, interconnect capacity, burner maintenance, permitting, or the cost of the switch itself, all of which belong in the full calculation and none of which live in a commodity index. What the ratio does reliably is tell you when the full calculation is worth re-running. It says that moment is now.

What to do with the number

Start with the assets that can already burn either fuel. Dual-fuel boilers and ovens configured during the spike are often still selected to the wrong side, and checking a setpoint is the cheapest energy project in the building. Next, re-quote the heat-heavy work: parts priced off spike-era gas carry phantom fuel cost, and in a competitive bid that phantom is margin a rival will happily take. Third, if an electrification proposal is on your desk, price its energy twice, once at the current ratio and once at the window average of 0.662, and fund it only if it clears both. And with the commodity at the 16th percentile of its archive, this is the moment to talk to your gas supplier about term, not the moment after the ratio reverts.

Put your connected load, run-hours, and both live tariffs into the power cost calculator and let the meters argue it out on your own numbers. Price your own switch

Published 2026-08-18.