Will my electric bill go up if a data center is built in Byron?

Directly, almost certainly not. A behind-the-meter data center does not buy electricity from ComEd; it buys it from the Byron Nuclear Plant directly. Residential rates are set by ComEd and approved by the Illinois Commerce Commission. There is a modest second-order effect on PJM wholesale capacity prices if a large share of the plant's output leaves the public grid, but that effect is small in the comparable deals analyzed to date, and it is more than offset by the avoided cost of the plant eventually closing.

When would construction of a Byron data center start?

Unknowable, as no project is announced. In the comparable Illinois deal (Meta at Clinton), the gap from PPA announcement to initial construction activity was approximately 12–18 months, with full commercial operation 24–36 months later. Applied hypothetically: if a Byron agreement were announced today, meaningful construction could begin late 2027, with full operation toward the end of the decade.

Byron & The Grid — A Citizens' Guide to Data Centers & the Byron Nuclear Plant

Q: Will a Byron data center be loud at night?

At the setbacks likely to apply, no. A modern closed-loop data center measures 55–65 dB at its property line; at the nearest homes, the perceived sound is typically indistinguishable from rural nighttime ambient. The exceptions are scheduled backup-generator tests, which are daytime, brief, and periodic. County zoning conditions can and typically do restrict test hours and require sound walls.

Q: How much water will a Byron data center use?

It depends on the cooling design. A modern closed-loop facility at 300 MW consumes roughly 25,000 gallons per day — about a tenth of what the Village of Byron already uses, and less than a tenth of a percent of the evapotranspiration from an adjacent corn field on a hot July afternoon. Legacy evaporative-cooled designs use roughly 40× more, but the current industry standard (and effectively universal for AI facilities) is closed-loop.

Q: Who owns the rezoned parcel near the Byron Nuclear Plant?

Parcel ownership is a matter of public record at the Ogle County Recorder. At the time of this writing, no announced buyer has been linked to the parcel, and ownership has not changed hands in a way that has been publicly reported.

Q: How many permanent jobs would a Byron data center bring?

For a 300–500 MW facility, the direct operational headcount is typically 80–200 positions. Indirect and induced employment (suppliers, maintenance contractors, services) runs 2–3× the direct number. The larger employment effect is the construction workforce — 1,200 to 2,500 people on site at peak — which is transitory but durable for two to three years.

Q: What are the downsides of a data center in Byron?

Three honest ones. First, construction disruption: two to three years of heavy truck traffic and dust, which zoning conditions mitigate but do not eliminate. Second, labor-market pressure: a construction surge tightens trades availability and housing short-term, raising local hotel and rental prices. Third, a modest wholesale capacity-price effect if a large share of the plant's output goes behind the meter — small but not zero.

Q: What happens if Byron says no — or if no developer comes?

The parcel remains zoned industrial. The Byron Nuclear Plant remains operating under its current revenue structure, which is healthier than it was in 2021 but is still exposed to the long-term economics of the wholesale power market. A nuclear plant that cannot secure sustained offtake is, eventually, a nuclear plant at risk of closure. The decision is about that risk as much as it is about construction disruption.

Q: How can Byron residents stay informed about data center plans?

The Ogle County Board and the Village of Byron post meeting agendas and minutes on their websites; any project application will move through one or both bodies before breaking ground. The Byron Observer and the Rockford Register Star cover regional industrial development. Constellation Energy files quarterly reports with the SEC that name their largest offtake contracts. Public comment at township and county meetings is the most useful civic instrument available.

§ I.

The Situation, as of April 2026

What we know, what we don't, and why a rezoning notice quietly moved a civic conversation from hypothetical to plausible.

Quietly, in a routine county hearing, a parcel of farmland adjacent to the Byron Nuclear Generating Station was reclassified from agricultural to heavy‑industrial use. The zoning change did not come with a press release. It came with a paragraph in the board minutes.

On its face, such a rezoning is a piece of administrative housekeeping. In the context of our town — a village of roughly 3,500 people sitting beside one of the largest sources of carbon‑free electricity in Illinois — it is something more: an invitation. Heavy‑industrial zoning does not commit the county to any particular project. It does, however, make a particular class of project possible.

The class of project most frequently speculated about, at kitchen tables and in the pages of the regional press, is a hyperscale data center. Nobody builds a warehouse next to a nuclear plant. They build a data center.

We emphasize again what the record shows: no developer has been named, no megawatt figure has been filed, and no construction timeline exists. What exists is a parcel, a utility, a pattern of comparable deals elsewhere in the country, and a community trying to understand, in advance, what the next decade could look like if the speculation becomes a signed lease.

The remainder of this page is our attempt to make that advance understanding possible.

“Heavy‑industrial zoning does not commit the county to any particular project. It does, however, make a particular class of project possible.”

§ II.

Why a Developer Would Look at Byron

A nearly‑closed nuclear plant, a national arms race for clean megawatts, and the accident of geography that has placed us in the middle of it.

In September 2021, Byron Nuclear Generating Station was scheduled to shut down. Exelon — the operator at the time — had filed the paperwork, the fuel was earmarked, and the shutdown date was on the calendar. The plant was saved, in the final hours, by the passage of Illinois' Climate and Equitable Jobs Act, which provided a zero‑emission credit that made continued operation economically viable.

The near‑miss matters. It matters because the plant's economics were marginal enough, just four years ago, that the community came within weeks of losing ~700 high‑paying jobs and roughly a fifth of Ogle County's property tax base. The thing that changed, more than anything, was demand. Between 2022 and 2026 — driven primarily by artificial intelligence — U.S. electricity demand began climbing in a way it had not climbed in a generation.

The country's large technology firms have concluded, essentially simultaneously, that they cannot secure enough clean, reliable power through the normal utility procurement process. In response they have begun writing very large checks directly to nuclear plants.

2,400

Byron Station's gross generating capacity, from two pressurized‑water reactors.

2044 / 2046

Year each reactor is licensed to operate through, per NRC renewal.

≈ 700

Direct employees at Byron Station, before counting contractors.

Sep 2021

The month the plant was scheduled — and nearly forced — to close.

The convergence is blunt. Data centers need large, firm, zero‑carbon electricity. Nuclear plants generate exactly that, and only that. A direct, behind‑the‑meter connection between the two solves two problems simultaneously: the technology company acquires power the grid cannot supply on the timeline it needs, and the nuclear plant acquires a multi‑decade revenue floor that keeps its reactors running and its workforce employed.

Byron is not unique in possessing this pairing. It is, however, one of a very short list of communities in the United States that does. That is the advantage — and, practically speaking, the reason a parcel near the plant got quietly rezoned.

§ III.

By the Numbers

Megawatts, gallons, decibels, and acres — the physical footprint of what a project here would actually require, rendered at scale.

III · a

Megawattage

How big is “big”?

Modern data centers are categorized by their electricity draw. A small colocation facility might use 5 to 20 megawatts (MW). A regional cloud campus, 50 to 200 MW. A frontier AI training site — the class of facility being built today — typically specifies between 300 MW and 1 gigawatt (1,000 MW).

To put the scale in local terms: an average Illinois household uses roughly one kilowatt on average, or 0.001 MW. A 300 MW data center consumes, continuously, about the same electricity as 300,000 average homes. Byron Station, at its full 2,400 MW output, generates enough for roughly 2.4 million. Any realistic data center project in Byron would therefore use a meaningful, but not majority, share of the plant's production.

CHART 01 · Annual electricity draw, comparative — megawatts

Single Illinois household 0.001 MW

< 0.01

Village of Byron, ≈ 3,500 residents ≈ 3.5 MW

3.5

Small colocation data center 10–50 MW

Typical regional cloud campus 100–200 MW

200

Plausible Byron project, mid‑range 300–500 MW
500

Largest announced AI campus, upper bound ≈ 1,000 MW

1,000

Byron Nuclear Plant, total output ≈ 2,400 MW

2,400

A 500 MW data center would use roughly one‑fifth of Byron Station's output. The remaining four‑fifths would continue to serve the regional grid.

III · b

Electricity & the Grid

What it would — and wouldn't — do to your bill.

The most persistent concern about hyperscale data centers, outside of water, is electricity price. The concern is well‑founded in places where a data center has simply plugged into the existing utility and added hundreds of megawatts of demand to a grid that had not planned for it. Wholesale prices rise; those increases eventually appear in retail bills.

The Byron case is structurally different. A behind‑the‑meter project would not draw from the regional grid (PJM's ComEd zone) during normal operation. It would consume electricity directly from the plant, under a private power purchase agreement. Residential customers in Byron and Ogle County would continue to buy from ComEd at ComEd's regulated rates.

There is a second‑order effect worth naming. Nuclear plants, Byron included, participate in the PJM capacity market. If a large share of Byron Station's output moves under a private contract, the plant's contribution to the PJM capacity auction falls, and auction prices across the zone could rise modestly. Independent analyses of the comparable deals suggest this effect is small — measured in single‑digit percent of wholesale capacity cost, not retail cost — but it is not zero. The honest statement is: behind‑the‑meter structuring insulates residential rates directly, but not perfectly.

The offsetting consideration: without the revenue from a data center offtake, plants like Byron face closure. A closed reactor raises wholesale electricity costs across the zone much more than a reactor running behind the meter does.

III · c

Water

The question most commonly asked at the township meetings.

The early generation of hyperscale data centers, built in the 2010s, used evaporative cooling. Water was sprayed through radiators to shed heat; a meaningful fraction of it evaporated. Reported figures from that era — millions of gallons per day — are the numbers most people have in mind when they ask about water.

The current generation of hyperscale data centers, and effectively all AI‑training builds, does not cool that way. The dominant design is closed‑loop liquid cooling: the same water circulates through the equipment and a radiator in a sealed system, shedding heat to the air without evaporation. A closed‑loop facility's water consumption is dominated by its sanitary use — roughly what a mid‑sized office park uses.

Byron sits near the Rock River, but a closed‑loop facility would not need river water for cooling in any meaningful volume. It would need a modest municipal or well tap. The comparison most useful to local residents is the one below.

CHART 02 · Daily water consumption, comparative — gallons

Average Illinois corn field, 120 ac, mid‑summer ET ≈ 1,100,000 gal

1.1 M

Legacy evaporative‑cooled data center, 300 MW ≈ 1,000,000 gal

1.0 M

Byron, residential + light commercial, ≈ 3,500 people ≈ 280,000 gal

280 k

Modern closed‑loop data center, 300 MW ≈ 25,000 gal
25 k

Single car wash, average day ≈ 6,000 gal

6 k

Figures are daily averages. A closed‑loop facility uses roughly 2% of the water a comparable legacy site would have used.

III · d

Noise

What it would sound like, standing at the property line.

A running data center is not a loud building in the usual sense. It has no production line, no compressors cycling on and off, no rumbling truck dock. Its dominant noise source is the cooling air moving through the facility, which at a modern closed‑loop site is delivered by banks of fans on the roof and exterior. Typical measured sound levels at the property line, with setbacks and sound walls built to current Illinois standards, range from 55 to 65 decibels (dB).

For reference, a refrigerator hum is roughly 40 dB, normal conversation 60 dB, and a residential dishwasher 70 dB. At distances of a quarter mile — roughly the setback that would apply between any rezoned parcel and the nearest Byron dwellings — the perceived sound level drops further, typically below 50 dB and often indistinguishable from ambient rural nighttime noise.

The louder noise events are backup‑generator tests, which are periodic (generally monthly), short (15–60 minutes), and scheduled during daylight hours. New diesel installations are required to meet EPA Tier 4 emissions standards, which also substantially reduce noise relative to older generators.

30 dB

Whisper / quiet bedroom at night

40 dB

Refrigerator, light rainfall

50 dB

Rural ambient, crickets, light breeze

55–65 dB
Modern data center, at property line

60 dB

Normal conversation, 3 feet

70 dB

Dishwasher, traffic at 25 mph

85 dB

Lawn tractor, semi‑truck passing

III · e

Environmental Footprint

Carbon, land, and the case for concentrating growth beside a zero‑emissions plant.

The environmental calculus of a data center depends almost entirely on the source of its electricity. A hyperscale campus powered by a natural‑gas grid emits, over its lifetime, on the order of several million tons of carbon dioxide. The same campus powered by an existing nuclear plant — already built, already licensed, already producing — emits effectively none.

This is why the pattern of nuclear co‑location has become the default for new AI infrastructure in the United States. It is not a coincidence. It is the only way to add this much electricity demand without adding fossil generation to keep up.

On land: a typical 300 MW data center campus occupies between 80 and 250 acres, counting buildings, substation, setbacks, and stormwater management. That is roughly the footprint of a large grain elevator operation or a mid‑sized ethanol plant, concentrated on already‑industrial‑zoned ground rather than dispersed across the rural township grid. Heavy‑industrial zoning, properly used, keeps industrial uses out of farmland that would otherwise remain productive.

Construction‑period impacts — dust, truck traffic, temporary noise — are real and are the trade‑off most commonly understated by supporters. They last between two and three years. Mitigation, including haul‑route agreements, restricted hours, and dust suppression, is a standard condition of industrial siting approvals in Illinois and would apply here.

§ IV.

The Money, Plainly

Property tax, construction payroll, permanent jobs, and the downstream effects a project of this scale tends to produce.

Of the potential benefits of a project in Byron, the most concrete — and the one most often undersold — is local tax revenue. Illinois assesses industrial property on one‑third of its fair cash value. Data center campuses, because of the very high cost of the electrical, mechanical, and computing equipment they install, sit at the top of the assessment scale.

The Illinois Data Center Investment Program offers qualifying projects a sales‑tax exemption on certain equipment purchases, plus a state‑level tax credit, in exchange for meeting wage and employment floors. Local property taxes are not exempted. That revenue flows to the same set of taxing districts that receive every other property tax dollar in the township.

TABLE 01 · Local property‑tax flow, illustrative for a $1 B industrial project in Ogle County

Taxing district	Typical share	Where the dollars go
Byron CUSD 226 (schools)	≈ 60%	Classroom staffing, facilities, instructional technology
Ogle County	≈ 15%	Sheriff, courts, public health, roads
Byron Fire Protection District	≈ 8%	Apparatus, paid‑on‑call staffing, EMS
Village of Byron	≈ 7%	Police, streets, parks
Byron Township / Road District	≈ 5%	Township roads, general assistance
Byron Public Library District	≈ 3%	Library operations, programming
Other (college, ag extension, etc.)	≈ 2%	Community college, 4‑H, misc.

Shares are illustrative, reflecting the general distribution in Ogle County levies. Actual allocations vary year to year. Assessment levels and levies are set by the county Assessor and the individual districts, respectively.

CONSTRUCTION · YEARS 0–3

1,200–2,500

peak trades workforce on site

A campus of this scale is built by electricians, pipefitters, ironworkers, concrete crews, mechanical contractors, and heavy‑equipment operators — the large majority of them hired through Local 145 (IBEW Rockford), Plumbers & Pipefitters Local 23, and the regional building trades. Hotels, restaurants, and rental housing see a two‑to‑three‑year bump.

OPERATIONS · YEARS 3+

80–200

direct permanent positions

Operations teams include site engineers, electrical and mechanical technicians, network operators, security, and facilities. Wages at existing comparable facilities in the region run from $75K at entry to $160K+ for senior roles. Most positions do not require a four‑year degree; several of the large operators partner directly with Illinois community colleges.

MULTIPLIER · INDIRECT

2–3 ×

indirect and induced jobs per direct

Supply, maintenance, cleaning, catering, contract engineering, IT services, and local retail — the indirect and induced multiplier for a capital‑intensive industrial facility is typically in the range of 2× to 3×. That implies, at steady state, roughly 160–600 additional jobs across the regional economy.

The less‑discussed economic effect, which matters disproportionately to Byron specifically, is the one on the nuclear plant itself. A long‑term offtake contract with a data center buyer creates a revenue floor that extends the economic life of the reactors well beyond their current license terms. The 700 jobs at Byron Station are not at risk today. They were at risk in 2021, and they will be again at some future point absent sustained demand. A data center deal — like the Microsoft deal at Three Mile Island, like the Meta deal at Clinton — is a hedge against that risk.

In practical terms: the rezoned parcel is not just a question of what a new facility would bring. It is, equally, a question of what the community already has and how long it keeps it.

§ V.

What Other Nuclear Towns Have Already Signed

Three deals, announced in the last twenty‑four months, that are the best available analogues for what Byron is looking at.

SEPT 2024 · PENNSYLVANIA

Microsoft × Three Mile Island

Operator: Constellation Energy
Structure: 20‑year PPA
Capacity: ≈ 835 MW
Plant action: Restarting Unit 1 (now “Crane Clean Energy Center”)
Purpose: Power for Microsoft's AI cloud (Azure)

The deal is widely regarded as the opening move in the nuclear‑AI era. It brings a retired reactor back online — an outcome that was considered implausible until the contract was signed.

MAR 2024 · PENNSYLVANIA

Amazon × Susquehanna

Operator: Talen Energy
Structure: Campus acquisition + PPA
Capacity: Up to 960 MW
Investment: $650 M (campus purchase)
Purpose: AWS hyperscale campus, co‑located

Amazon Web Services purchased the land and facilities directly adjacent to Talen's Susquehanna plant. The deal has since been the subject of ongoing FERC proceedings that are clarifying the regulatory framework for behind‑the‑meter arrangements at this scale.

JUN 2025 · ILLINOIS

Meta × Clinton

Operator: Constellation Energy
Structure: 20‑year PPA
Capacity: ≈ 1,121 MW
Plant action: License renewal + 30 MW uprate
Purpose: Meta's AI training infrastructure

The closest analogue to Byron, both geographically and structurally. Clinton Power Station, in DeWitt County, faced closure pressure similar to Byron's 2021 scare. The Meta agreement extends the plant's economic life through the 2040s and sustains its 500+ jobs.

The pattern across the three deals is consistent: a multi‑decade contract, a reactor whose future was not guaranteed before the contract, a technology buyer who cannot secure comparable clean power on the normal grid timeline, and a host community whose tax base and employment footprint become meaningfully more durable.

Byron fits the pattern. Whether any individual developer ultimately moves forward here is a question no one outside the negotiating room can answer. Whether the community is, as a technical matter, well‑situated for such a move is not a close call.

§ VI.

Frequently Asked Questions

Straight answers, with the uncertainty left in where it belongs.

Will my electric bill go up?

Directly: almost certainly not. A behind‑the‑meter data center does not buy electricity from ComEd; it buys it from the plant. Your residential rate is set by ComEd and approved by the Illinois Commerce Commission. Indirectly, there is a modest upward pressure on wholesale capacity prices across the PJM ComEd zone if a large share of Byron's output leaves the public grid. That effect is small in the comparable deals analyzed to date, and it is more than offset by the avoided cost of the plant closing.

Will it be loud at night?

At the setbacks likely to apply, no. A modern closed‑loop facility measures 55–65 dB at its property line; at the nearest homes, the perceived sound level is typically indistinguishable from rural nighttime ambient. The exceptions are scheduled generator tests — daytime, brief, periodic. County zoning conditions can (and typically do) restrict test hours and require sound walls on the building envelope.

How much water will it actually use?

Depends on the cooling design. A closed‑loop facility at 300 MW consumes on the order of 25,000 gallons per day — roughly ten percent of what the Village already uses, and less than a tenth of a percent of the evapotranspiration from an adjacent corn field on a hot July afternoon. A legacy evaporative‑cooled design at the same electrical size would use ~40× more. The current industry default, and effectively universal for AI sites, is closed‑loop. Any project here can and should be required, at the zoning approval stage, to specify its cooling design.

Who owns the rezoned parcel?

Parcel ownership is a matter of public record at the Ogle County Recorder. At the time of this writing, no announced buyer has been linked to the parcel; ownership has not changed hands in a way that has been publicly reported.

How many permanent local jobs would it really bring?

For a 300–500 MW facility, the direct operational headcount is typically 80–200. Indirect and induced employment (suppliers, maintenance contractors, services) runs 2–3× the direct number. The larger employment effect is the construction workforce — 1,200 to 2,500 people on site at peak — which is transitory but durable for two to three years.

What's the downside — plainly?

Three honest ones. First, construction disruption: two to three years of heavy truck traffic and dust, which zoning conditions mitigate but do not eliminate. Second, labor‑market pressure: a construction surge tightens trades availability and housing short‑term, which raises local hotel and rental prices during the build. Third, a modest wholesale capacity‑price effect if a large share of the plant's output goes behind the meter — small, but not zero. A responsible approval process will account for all three.

What happens if we say no — or if no developer comes?

The parcel remains zoned industrial. The plant remains operating under its current revenue structure, which is healthier than it was in 2021 but is still exposed to the long‑term economics of the wholesale power market. A nuclear plant that cannot secure sustained offtake is, eventually, a nuclear plant at risk of closure. The decision to welcome or not welcome a large customer is a decision about that risk as much as it is about construction disruption.

When would construction start?

Unknowable, as no project is announced. In the comparable Illinois deal (Meta at Clinton), the gap from PPA announcement to initial construction activity was approximately 12–18 months; full operation follows 24–36 months later. Applied hypothetically: if a Byron agreement were announced today, meaningful construction could begin late 2027 with full commercial operation toward the end of the decade.

How do I stay informed?

The Ogle County Board and the Village of Byron post meeting agendas and minutes on their websites; any project application will move through one or both bodies before breaking ground. The Byron Observer and the Rockford Register Star cover regional industrial development. Constellation Energy files quarterly reports with the SEC that name their largest offtake contracts. Public comment is, in all cases, the most useful civic instrument you have; it is read, it is logged, and for projects of this scale it is consequential.

§ VII.

Sources & Methodology

How we compiled this page, which numbers are ranges, and where to go when you want to check us.

Where an exact figure for Byron is not yet public (megawattage, water use, acreage, jobs), we present ranges derived from three categories of source: the three comparable nuclear‑adjacent data center deals announced since 2024; aggregated industry benchmarks published by Lawrence Berkeley National Laboratory and the Uptime Institute; and publicly filed financial and regulatory documents from Constellation Energy, Talen Energy, and their counterparties. Where a single number is cited for Byron Station (output, workforce, license dates), it is drawn from Constellation's 2025 annual report and U.S. Nuclear Regulatory Commission filings.

We wrote this page because the rezoning notice is a matter of public record but the fact pattern around it is scattered across financial filings, industry white papers, trade press, and PJM capacity‑market data — none of which are easy to read as a neighbor. Any errors are ours. Corrections are welcome.

01 U.S. Energy Information Administration. Electric Power Monthly, January 2026 release. Generation data by plant; Byron Station (plant code 6023).
02 Lawrence Berkeley National Laboratory. United States Data Center Energy Usage Report, 2024. Water usage effectiveness, closed‑loop vs. evaporative cooling.
03 Uptime Institute. Global Data Center Survey 2024. Facility sizing, noise, cooling architecture prevalence.
04 Illinois Department of Commerce and Economic Opportunity. Data Center Investment Program Guidelines, current edition. Sales tax exemption eligibility, wage floors.
05 Constellation Energy Corporation. Form 10‑K, Fiscal Year 2025. Plant output, workforce, PPA disclosures (Three Mile Island / Crane; Clinton).
06 U.S. Nuclear Regulatory Commission. Byron Station, Units 1 & 2, License Renewal, Docket 50‑454 / 50‑455. Extended operating licenses through 2044 / 2046.
07 Federal Energy Regulatory Commission. Docket ER24‑2172, Talen / Amazon interconnection service agreement. Behind‑the‑meter regulatory framing.
08 PJM Interconnection. 2025/26 Base Residual Auction Results. ComEd zone capacity‑price context.
09 Microsoft Corporation, press release, 20 September 2024. Three Mile Island Unit 1 restart announcement.
10 Talen Energy Corporation, press release, 4 March 2024. Amazon Web Services campus transaction.
11 Meta Platforms, Inc., press release, June 2025. Clinton Power Station 20‑year PPA with Constellation.
12 Ogle County, Illinois. Assessor and Recorder public records. Parcel zoning, ownership, assessed valuation history.
13 Illinois General Assembly. Climate and Equitable Jobs Act (CEJA), Public Act 102‑0662. Zero‑emission credits for Byron Station.