Eolian Broke Ground on Ohio's First Grid-Scale Battery This Summer. The Data Centers It Sits Next To Are Projected to Double the State's Share of Power They Use.

Crews started pouring foundations in Jersey Township, Ohio this summer on 15 acres along Jug Street Road, a stretch of farmland in Licking County that most of the state would have no reason to drive past. What's going into the ground there is Flint Grid, a 200-megawatt battery storage system built and owned by Eolian, and it's a genuinely new kind of structure for Ohio: the state's first stand-alone, grid-scale battery, built specifically to sit inside the corridor pulling the fastest-growing electricity demand in the PJM grid.

A permit that waited four years for a market

The Ohio Power Siting Board certified Flint Grid on October 20, 2022, the same day it approved a separate solar project called Harvey Solar, and the law firm record of that approval calls it the first stand-alone battery energy storage facility the board had ever reviewed. The project certified that day was specced at 200 megawatts with four hours of duration, 800 megawatt-hours of total storage. Nobody broke ground. For almost four years, Flint Grid was a real, approved, fully permitted project sitting unbuilt, which is a more common fate for battery storage than the industry's announcement cycle usually lets on: a certificate of need answers whether a project is allowed to exist, not whether anyone is willing to pay for the capacity it would provide.

What changed by this summer wasn't the permit. Eolian announced on July 29th that Flint Grid had entered construction, and the project going into the ground is a bigger version of the one the state certified: still 200 megawatts, but stretched to roughly 5.3 hours of duration and about 1.06 gigawatt-hours of total storage, a third more energy capacity than the original filing. The company says Flint Grid is the first large-scale battery to qualify for PJM's capacity market and the largest battery to clear the 2027/28 Base Residual Auction, accounting for more than half of the new battery storage capacity cleared for that delivery year. I can confirm Flint Grid cleared that auction. I can't independently confirm it's the single largest battery bid that cleared it, because that requires ranking it against every other storage project's bid in an auction PJM doesn't publish project-by-project, so that particular superlative is Eolian's own characterization, not a number this blog checked against PJM's own ledger.

The physical connection to the grid is almost deliberately unremarkable, which is itself worth noting. AEP filed for a new 138-kilovolt line tying Flint Grid into its existing Jug Street substation in May 2025, a line the filing describes as less than a tenth of a mile long. That's the entire interconnection: no new long-haul transmission corridor, no contested right-of-way fight, just a short jumper wire connecting a battery to a substation that was already there. Eolian expects the project in commercial operation before PJM's 2027/28 delivery year begins on June 1, 2027.

Why it's sitting next to this particular interchange

Jersey Township sits a few miles from New Albany, Ohio, which has become one of the densest data center clusters in the country almost entirely in the last few years. Intel is building a chip fabrication plant there. Meta is finishing Prometheus, a campus reported as the first data center anywhere designed to draw more than a full gigawatt on its own. Google, Microsoft, Stack Infrastructure, QTS, Vantage, and EdgeConneX all have projects in the same corridor, in various stages from under construction to operating. A state-commissioned report released in January projected that data centers would grow from 5.3 percent of Ohio's total electricity consumption to 10.9 percent within four years, a near-doubling of the industry's share of the grid in a state that was, a decade ago, not a significant data center market at all.

AEP, the parent of the utility serving most of that corridor, has been putting real numbers behind that growth on its own earnings calls. The company told investors its contracted large-load capacity grew from 63 gigawatts at the end of the first quarter of 2026 to 69 gigawatts by the second quarter, and said roughly 90 percent of that growth is tied to data centers, concentrated mostly in Ohio and Texas. Those aren't projections pulled from a developer's pitch deck; they're the figures a public company is reporting to its own shareholders, which puts them a rung higher on the evidence ladder than most of the capacity claims that cross this blog's desk. A single 200-megawatt battery doesn't come close to matching that growth. What it does is prove the corridor can actually get something new and useful built, permitted, financed, and connected, in the same calendar year the demand around it kept climbing.

I went looking for the fight that normally accompanies a project like this on this blog, and I didn't find one. No packed township trustees' meeting, no lawsuit, no organized opposition group, nothing in the public record suggesting anyone in Jersey Township is unhappy about fifteen acres of batteries going in next to a substation that was already there. That absence is a real data point, not a gap in my research: a battery storage facility on a small footprint, tied into existing infrastructure with a tenth of a mile of new wire, is a fundamentally smaller target for local opposition than a gas plant, a water-intensive campus, or a multi-gigawatt rezoning fight. It's also not evidence that the broader cost question has gone away. It just means that fight is happening somewhere else: in front of FERC and PJM's own stakeholder committees, where this blog has already covered the open argument over who ultimately pays for the capacity data centers are pulling onto the grid, not in a Licking County meeting room.

What I'd tell anyone sizing up a site in this corridor is to spend less time on the superlatives in the press release and more time on the two things that are actually on the public record: Ohio Power Siting Board case 21-1061-EL-BGN, the 2022 certificate that makes Flint Grid real, and the 2025 AEP interconnection filing for the Jug Street tie line that makes it connectable. Neither one needed a company's own framing to be true in 2022, and neither one needs it now. The more interesting story in Jersey Township isn't that Eolian built the biggest battery in PJM. It's that a project can sit fully permitted and completely unbuilt for four years, and then go from announcement to poured concrete in the same season the market around it finally caught up to the paperwork.