A Vermont chip factory added about 6 MW of solar and a 16 MW battery - and the battery is the part that pays
GlobalFoundries says its Essex Junction, Vermont semiconductor site now has about 6 MW of on-site solar and a 16 MW battery, built by Encore Renewable Energy and Lightshift Energy. Vermont Business Magazine puts the spend at $40 million and the battery at four hours. The systems come fully online in the coming months. No savings figure is published.
A chip factory in Vermont just put a big battery in its back yard.
GlobalFoundries said on 5 October that its Essex Junction site now has about 6 MW of new on-site solar and a 16 MW battery. Encore Renewable Energy built the solar. Lightshift Energy built the battery. Green Mountain Power and VELCO, the state's transmission company, were the utility partners. The company says the systems come fully online in the coming months and will run for more than 20 years.
First, the terms. MW is how hard a system can push. MWh is how much energy a battery holds. Think of MW as the width of the tap and MWh as the size of the tank. Vermont Business Magazine says the battery runs four hours at full power. Sixteen MW for four hours is about 64 MWh. (The magazine printed "64 kilowatt hours." That looks like a typo. GlobalFoundries has not published a MWh figure.)
How it works. The magazine says the solar feeds the grid, and the battery charges from the grid when power is cheapest and sends it back when power is dearest. Lightshift says the real point is shaving peak demand. In plain words: the battery trims the few most expensive hours of the year, the ones that set big network bills for the site and the state.
The care part. GlobalFoundries' Fab 9 boss, Dan Colello, said the battery was studied and designed to sit next to "highly sensitive" chip-making gear, because power quality matters on that site. That is the lesson for any buyer running sensitive machines. Before a battery goes on your switchboard, get someone to check how it behaves when it switches, not just how big it is.
The land. Encore says more than 30 acres of old industrial land now carries the solar. Vermont Business Magazine says the job cost $40 million.
Analogy: the solar is a tap that runs in daylight. The battery is a four-hour bucket. You fill it when water is cheap and empty it in the hour the water company charges the most.
Workplace meaning. Most factories will never build 16 MW. But the shape scales down. If your power bill has a demand or peak charge, a battery sized to cut those few peak hours can earn more than the same money spent on extra panels.
Good: A real factory, real sizes, named builders and utilities, and a clear reason (peak shaving) for the battery.
Bad: No MWh from the company, no savings figure, no payback, and no split of how much value goes to the factory versus Vermont's grid.
Ugly: By the magazine's account the solar is exported, not used on the factory floor. This is mostly a grid and peak-cost play. And "fully online in the coming months" means it is not fully running yet.
Soft next step: pull 12 months of interval data and find your 10 most expensive hours. If they cluster, a battery sized to cover them may beat more solar. Then a short consult at Sovryn Energy /consult if you want that read against your bill.
Source: GlobalFoundries press release, 5 Oct 2026 - GlobalFoundries marks milestone in its energy journey at Vermont site. Primary for ~6 MW on-site solar, 16 MW battery, Encore Renewable Energy and Lightshift Energy developers, VELCO and Green Mountain Power partners, power-quality design quote (Dan Colello), 30+ acres (Chad Farrell), "Vermont's largest battery" and peak-demand quote (Michael Herbert), fully online in coming months, 20+ years in service. Vermont Business Magazine, 5 Oct 2026 - GlobalFoundries lights up solar and battery energy storage project. Source for $40 million investment, two solar fields (Essex Junction near Maple Street and existing Williston field), solar fed into the grid, battery charge/discharge on price, four-hour maximum (printed as "64 kilowatt hours").