How things actually work.

Category: Technical Analysis

Detailed examinations of specific technical and policy questions — grid mechanics, water systems, tax structures, environmental claims, and the information ecosystem around data center development.

How Meta’s Data Center Affected DeKalb County Property Taxes (2020–2024)

Meta vs. Non-Meta EAV growth along Gurler Road, DeKalb County, 2021–2024. Source: DeKalb County assessment records.

AI tools were used in the research, drafting, and editing of this article. All factual claims are sourced to primary documents and verified by the author.

Residents in DeKalb and Sycamore have had understandable questions about how Meta’s data center and other recent developments affect property values, tax bills, and local budgets. With assessments rising and different taxing bodies making different levy decisions, it can be hard to make sense of what’s happening. This addendum consolidates actual county tax bills, public levy notices, parcel-level data, and Enterprise Zone documents to provide a clear explanation of what occurred between 2020 and 2024.

This article is part of the broader series “What Data Centers Actually Mean for Northern Illinois Communities”.It focuses specifically on property taxes – giving residents, officials, and skeptical readers a complete, source-rich breakdown of this topic without having to sift through the whole overview piece.

1. How Illinois Property Taxes Really Work

Illinois uses a levy-based property tax system.[68] Each taxing body – school district, city, park district, township, library, or county – decides how many dollars it needs for the year. The tax rate is then determined automatically:

Rate = Levy ÷ Equalized Assessed Value (EAV).[68][69]

Your tax bill depends not only on your home’s EAV but also on the total EAV of the whole taxing district. When the tax base grows, the same levy can be shared across more value, which lowers the rate and reduces the burden for each resident.[70, “How Rates Are Set”]

This is why large commercial and industrial projects can meaningfully shift the tax load.

2. What an Enterprise Zone Abatement Actually Is

An Enterprise Zone abatement does not refund taxes and does not give money back to a company. It temporarily discounts only a portion of the new value created by the improvement through new construction.[74, “Property Tax Abatement”][75, Subpart J §§520.1000–1030]

Land and pre-existing improvements remain fully taxed. Only a portion of the new value is abated for a fixed period.

A simple way to think about it: Collecting 50% of something is better than collecting 100% of nothing.

Without the project, that new value – and its revenue – would not exist. With it, communities receive millions in new dollars even during the abatement period.[70, FAQ #4]

3. Meta’s Actual Taxes Paid in 2024

Three Meta parcels were fully on the 2024 tax rolls:

Parcel 11-01-100-004 • EAV: $531,240,341 • Total tax: $31,458,804.32[71]

Parcel 11-02-200-004 • EAV: $7,362,771 • Total tax: $587,162.06[72]

Parcel 11-01-100-005 • EAV: $333,896 • Total tax: $26,627.36[73]

Total paid by Meta in 2024: $32,072,593.74

Approximately $19.43 million went to School District 428 (derived from taxing-body splits in [71]–[73]). Another $12.64 million was allocated to the City, County, Park District, Library, Township, Kishwaukee College, and other entities.

These are actual numbers already reflected in local budgets.

4. Meta’s Abatement in Context

The 2024 Enterprise Zone report confirms: • 55% abatement on new improvements • 20-year schedule beginning with 2024 taxes[76, p. 2]

The abated amount on the main parcel’s new improvement value in 2024 was approximately $10.9 million. Without abatement, the total potential would have been roughly $42 million across the phased schedule.[76, p. 3]

Yet, Meta still paid approximately $31.5 million for the main parcel in 2024.

Even with abatement, Meta is one of the largest taxpayers in northern Illinois.

5. DeKalb vs. Sycamore: What Actually Happened to Homeowners (2020–2024)

Nearly all parcels saw EAV increases due to market conditions:[82] • DeKalb: 97.9% of parcels increased • Sycamore: 97.3% of parcels increased

But tax bills diverged sharply:

Parcels where total tax decreased: • DeKalb: 81.5% • Sycamore: 11.2%

Detailed movement (EAV ↑/↓ vs Bill ↑/↓), using 2020–2024 parcel-level data:[82]

DeKalb • EAV↑ & Tax↓: 7,813 parcels (73.2%) • EAV↑ & Tax↑: 1,820 parcels (17.0%) • EAV↓ & Tax↓: 93 parcels • EAV↓ & Tax↑: 1 parcel

Sycamore • EAV↑ & Tax↓: 803 parcels (10.1%) • EAV↑ & Tax↑: 6,375 parcels (79.9%) • EAV↓ & Tax↓: 45 parcels • EAV↓ & Tax↑: 0 parcels

The difference is largely due to DeKalb’s rapidly expanding commercial/industrial tax base – Meta, Ferrara, Amazon, and others in District 428 – versus Sycamore’s comparatively slow growth.[82]

Meta vs. Non-Meta EAV growth along Gurler Road, DeKalb County, 2021–2024. Source: DeKalb County assessment records.

6. The City of DeKalb’s Proposed Levy Increase

Official City notice for 2025 shows:[77]

• Levy increase: 7.65% • EAV increase: 7.65% • Tax rate: 0.62286 → 0.62284 (essentially flat)

When levy and EAV rise together, the rate stays stable. New commercial/industrial EAV absorbs the increase.

7. The Park District’s 2025 Proposal and Long-Term Trend

Park District’s 2025 notice:[78]

• Levy increase: 8.03% • Rate increase: 0.49147 → 0.55090 (~12.1%)

Their example shows the Park District line on a ~$300k home rising from ~$511 to ~$633.

However, context matters: From 2019 to 2024, the Park District tax rate decreased by 32%, from 0.72045% to 0.49147%, as the EAV more than doubled.[79]

Even with the proposed 2025 increase, the rate remains 23% lower than in 2019.

8. Why Some Individual Bills Still Rose

Even when a district experiences a strong rate compression overall, individual bills may rise when:

• A particular home’s EAV increases faster than average • Improvements were added • Exemptions changed • Smaller taxing bodies increased levies faster than their EAV rose[70, “Why Bills Vary”]

These are individual circumstances – not contradictions of the multi-year pattern.

9. What This Addendum Does Not Claim

This addendum does not claim: • that taxes never rise • that abatements have no cost • that large taxpayers eliminate levy increases • that every homeowner saw the same outcome

It reports on what occurred from 2020 to 2024, using actual tax bills and official documents.

10. A Call to Action

Residents can request that their taxing bodies provide clearer levy/EAV explanations, side-by-side comparisons, and plain-language breakdowns of how new construction affects tax rates.

Taxing bodies can improve transparency by providing simple levy/EAV charts and clean explanations of each line item.

11. Closing Thoughts

Between 2020 and 2024, DeKalb added hundreds of millions of dollars of new commercial and industrial EAV.[82]

Meta alone contributed more than $32 million in taxes in 2024.[71–73]

This expanded base allowed District 428 and others to maintain necessary revenue while lowering tax rates, resulting in most DeKalb homeowners seeing lower tax bills even as assessments rose.

Sycamore, without similar development, experienced the opposite trend.[82]

The multi-year pattern is clear: When more value shares the load, homeowners benefit.

Methods & Transparency

I utilize a range of AI and automation tools, in conjunction with my own research, to organize and verify complex public data – from DeKalb County tax rolls and DevNet parcel records to PJM TEAC maps and ComEd reliability filings. ChatGPT has been the primary workhorse for synthesis, but I also utilize Copilot, Gemini, Claude, and Grok to cross-check facts, refine tone, and develop Python-based tools for analysis. Grammarly keeps the writing clear – I use it for nearly everything I write, even texts.

Over the past several months, I’ve invested well over 100 hours reviewing, verifying, and refining this information. I have also permanently archived more than 100 key source documents in the Internet Archive’s Wayback Machine to ensure transparency and durability. The work is still ongoing as new filings and community feedback come in.

Every figure and citation is sourced from public records that you can verify independently. My goal is to make complex infrastructure and taxation topics accessible and understandable to everyone in the community. I’m just a local guy with a day job and a family, trying to make the public data we already have a little easier for everyone to understand.

This article is part of the Data Centers: The Public Record series. View all technical analysis →

[68] Illinois Department of Revenue – PTAX-60 Property Tax Rate and Levy Manual https://web.archive.org/web/20250728002219/https://tax.illinois.gov/content/dam/soi/en/web/tax/research/publications/documents/localgovernment/ptax-60.pdf

[69] 35 ILCS 200 – Property Tax Code (Art. 18, §18-50) https://web.archive.org/web/20251115214636/https://www.ilga.gov/Legislation/ILCS/Articles?ActID=593&ChapterID=8&SeqStart=6700000&SeqEnd=8000000

[70] DeKalb County Finance Office – Property Tax Levies & Rates (“How Rates Are Set,” “Why Bills Vary,” FAQ #4) https://web.archive.org/web/20240723184239/https://dekalbcounty.org/departments/finance-office/financial-tax-information/property-tax-levies-rates/

[71] DevNet – Parcel 11-01-100-004 (2024 Tax Bill) https://web.archive.org/web/20251115143744/https://dekalbil.devnetwedge.com/parcel/view/1101100004/2024

[72] DevNet – Parcel 11-02-200-004 (2024 Tax Bill) https://web.archive.org/web/20251115143737/https://dekalbil.devnetwedge.com/parcel/view/1102200004/2024

[73] DevNet – Parcel 11-01-100-005 (2024 Tax Bill) https://web.archive.org/web/20251115144001/https://dekalbil.devnetwedge.com/parcel/view/1101100005/2024

[74] Illinois DCEO – Enterprise Zone Program (“Property Tax Abatement”) https://web.archive.org/web/20251115210754/https://dceo.illinois.gov/expandrelocate/incentives/taxassistance/enterprisezone.html

[75] 14 Ill. Adm. Code Part 520 – Enterprise Zone Rules (Subpart J §§520.1000–1030) https://web.archive.org/web/20251115210753/https://www.ilga.gov/agencies/JCAR/EntirePart?titlepart=01400520

[76] DeKalb County – Enterprise Zone Abatement Report, Tax Year 2024 https://web.archive.org/web/20251115144040/https://dekalbcounty.org/wp-content/uploads/2025/05/tr-ez-abatement24-25.pdf

[77] City of DeKalb – 2025 Proposed Property Tax Levy Increase Notice https://web.archive.org/web/20251115211405/https://www.cityofdekalb.com/DocumentCenter/View/19994/9-2025-BBN-Pub-110125

[78] DeKalb Park District – Truth in Taxation 2025 https://web.archive.org/web/20251115210919/https://dekalbparkdistrict.com/news/truth-in-taxation-2025

[79] DeKalb Park District – Tax Levy & EAV Historical Summary (2019–2024) https://web.archive.org/web/20251102171237/https://dekalbparkdistrict.community.highbond.com/document/13a4a189-cf56-4454-938f-ba9ef5a28ade/

[80] Supervisor of Assessments – Annual Report 2022 (p. 7: abatement applies only to new construction) https://web.archive.org/web/20240714172127/https://dekalbcounty.org/wp-content/uploads/2023/05/ao-annrpt-2022.pdf

[81] DevNet public lookup landing page https://web.archive.org/web/20251115212527/https://dekalbcounty.org/departments/treasurer-collector/

[82] DeKalb County Treasurer – parcel-level EAV/tax datasets for 2020–2024 (via data request; public lookup at dekalbil.devnetwedge.com) https://web.archive.org/web/20251115212527/https://dekalbcounty.org/departments/treasurer-collector/

November 18, 2025
Why Electric Bills Really Rose, and What It Means for Data Centers
High-voltage transmission towers in the Chicago suburbs. Photo: 1250metersdeep / Wikimedia Commons (CC0).

AI tools were used in the research, drafting, and editing of this article. All factual claims are sourced to primary documents and verified by the author.

Since publishing my original article on what data centers mean for our region, many readers have asked whether these facilities are responsible for higher electric bills. This article explains how Illinois’ electricity system actually works, why prices rose across PJM, and what is being done to stabilize costs.

This article is part of the broader series “What Data Centers Actually Mean for Northern Illinois Communities”. It focuses specifically on electricity – giving residents, officials, and skeptical readers a complete, source-rich breakdown of this topic without needing to sift through the whole overview piece.

How the electric system works

Every electric bill has two main components:
- Delivery – the poles, wires, substations, and maintenance regulated by the Illinois Commerce Commission (ICC) [39].
- Supply – the energy you use, priced through PJM Interconnection’s wholesale electricity markets [40].
PJM manages the reliability of a 13-state grid. Each year it runs a capacity auction that pays power plants to be available during peak demand three years in advance [41]. These payments function like a hospital keeping extra beds staffed during flu season – not because they’re needed every day, but because they must be ready for unexpected surges [42].

Why prices rose – the regional imbalance

For nearly a decade, PJM had more generating capacity than it needed [43]. That changed in the mid-2020s as three forces reshaped the grid:

1. Plant retirements. PJM reports significant coal and natural-gas retirements across the region in the 2023–2027 period [44]. 2. Higher reliability margins. PJM raised its Installed Reserve Margin (IRM) from ~18% to just over 19% for the 2026/27 auction [45], which translates to several additional gigawatts of required dependable capacity across a 140–150 GW system [64]. 3. Renewable derating. PJM’s ELCC ratings show that wind and solar only count at a fraction of nameplate capacity – onshore wind at ~21–38%, and solar at ~14–50% depending on year and configuration [67].

Meanwhile, PJM’s demand forecast added several gigawatts of new load, including data centers, EV manufacturing, and general growth [47]. But this increase was far smaller than the dependable supply removed by retirements, higher reserve requirements, and derating.

Bottom line: PJM faced a structural shortfall – several gigawatts of new demand versus well over ten gigawatts of effective supply lost on paper. That imbalance, not local projects, drove capacity prices higher across the region [49].

Why Illinois moved with everyone else

Illinois retained its nuclear fleet (Byron, Braidwood, and Dresden), which helps regional reliability. But because PJM sets capacity prices for the entire multi-state system, any shortfall anywhere raises costs everywhere:
- PJM allocates reliability costs region-wide [51].
- Higher auction prices flow through to all load-serving entities, including ComEd.
Illinois didn’t pay for other states’ mistakes – it paid for its share of regional reliability insurance.

What the headlines got wrong

Recent news stories often blamed data centers for rising bills. That narrative was catchy but inaccurate.
- The cost increase was regional, not local.
- The main drivers were retirements, higher reserve margins, and renewable derating.
- Illinois does not subsidize big-tech hookups; ICC rules require large users to pay their own interconnection costs.
- Homes and hospitals get priority during emergencies; large users curtail or self-supply first.
- Capacity auctions can show sharp local price effects even when system-wide demand from data centers remains modest.
Oversimplified coverage distorted a complex, 13-state reliability issue into a single cause.

Regulatory and legislative responses – and the role of CUB

Illinois and federal agencies are responding to this reliability gap:
- Clean and Reliable Grid Act (2025) repealed the state’s nuclear moratorium and authorizes advanced reactors [52].
- Grid-scale storage incentives support battery deployment.
- ComEd Multi-Year Plan (ICC 24-0181) funds grid modernization and replacement of aging infrastructure [53].
- Federal actions include DOE loan programs and FERC Order 1920 on long-distance transmission [54].
This process has been contentious. CUB notes that the ICC ultimately cut 65% of ComEd’s proposed $1.47B increase after finding excessive capital spending [55]. That kept bills lower in the short term, but delaying upgrades also contributed to infrastructure strain across the region.

Local construction, consumer protection, and who pays for upgrades

Illinois law draws a firm line between:
- Shared grid improvements (rate-funded), and
- Customer-specific capacity additions (customer-funded).
Under PJM and ICC rules:
- Large users pay 100% of their interconnection costs [56][58].
- ComEd confirms that new large load must pay for its own tie-ins and load-specific upgrades [59].
- Pending legislation (SB 2181 / HB 4120) would enhance usage reporting and strengthen ICC oversight [60].
Residential customers do not subsidize corporate hookups.

Who gets priority during grid stress

Emergency plans are unambiguous:
- Homes, hospitals, and essential services are treated as firm load under NERC rules [61].
- Many large industrial facilities – especially data centers – take interruptible or curtailable service and operate backup generation [62].
- In practice, large users curtail first, preserving neighborhood reliability.
The idea that industry gets priority over residents is simply false.

Consumer impact – and how to read your bill

A typical household uses ~800–900 kWh per month with a bill in the low-$100s [63].

Delivery: 45–50% – ComEd infrastructure and maintenance (ICC-regulated) Supply: 40–45% – Energy + PJM capacity costs Taxes & Riders: 5–10% – State and municipal programs

2024–2026 cost drivers

Driver Monthly impact Notes PJM reliability / capacity +$8–12 Region-wide tightening [64] Delivery modernization +$5–6 ICC 24-0181 State policy riders +$1–2 Various programs Data-center load ~$0–$2 Modest system impact; localized auction effects in some zones [66]

PJM’s Market Monitor found that data center load affected the 2026/27 capacity auction in certain pockets [66], but that effect occurred on top of the region-wide shortfall created by retiring plants and increased reserve requirements.

The nuclear revival

Nuclear power remains the backbone of Illinois’ reliability. With the moratorium lifted, the state can now pursue both advanced large reactors and small modular reactors (SMRs) [52]. These plants:
- Provide multi-day onsite fuel
- Deliver stable operating costs
- Offer high reliability value in PJM
- Reduce dependence on natural gas
- Fit well into Illinois’ existing transmission corridors
As the state maintains its existing fleet and explores new nuclear development, nuclear energy will be central to long-term cost stability and grid security.

Myths vs. facts

Myth: “Data centers caused bills to spike.” Fact: The major drivers were retirements, higher reserve margins, and renewable derating. Data centers influenced one auction year in some pockets but were not the primary region-wide cause [66].

Myth: “Industry gets power before homes.” Fact: Homes and hospitals are firm load; large users curtail and rely on generators during emergencies [61][62].

Myth: “Ratepayers fund corporate hookups.” Fact: ICC and PJM rules require large customers to fund their own interconnections [58][59].

Myth: “ComEd raises rates whenever it wants.” Fact: All delivery rates require ICC review and public comment.

Myth: “Renewables can replace all firm generation.” Fact: PJM’s ELCC shows wind and solar count only partially toward reliability, making firm resources essential [67].

Looking ahead

Illinois and PJM are rebuilding the dependable capacity that keeps the lights on. Grid modernization, advanced nuclear, and long-distance transmission planning should gradually ease costs over the late 2020s. Higher bills today reflect the cost of rebuilding reliability after years of under-investment – not the result of recent development. Data centers did not create the structural shortfall; in many cases, they help fund the solutions.

Methods & Transparency

I utilize a range of AI and automation tools, in conjunction with my own research, to organize and verify complex public data – from DeKalb County tax rolls and DevNet parcel records to PJM TEAC maps and ComEd reliability filings. ChatGPT has been the primary workhorse for synthesis, but I also utilize Copilot, Gemini, Claude, and Grok to cross-check facts, refine tone, and develop Python-based tools for analysis. Grammarly keeps the writing clear – I use it for nearly everything I write, even texts.

Over the past several months, I’ve invested well over 100 hours reviewing, verifying, and refining this information. I have also permanently archived more than 100 key source documents in the Internet Archive’s Wayback Machine to ensure transparency and durability. The work is still ongoing as new filings and community feedback come in.

Every figure and citation is sourced from public records that you can verify independently. My goal is to make complex infrastructure and taxation topics accessible and understandable to everyone in the community. I’m just a local guy with a day job and a family, trying to make the public data we already have a little easier for everyone to understand.

This article is part of the Data Centers: The Public Record series. View all technical analysis →

[39] ComEd Multi-Year Rate Plan Order (Docket 24-0181), p. 13 – Delivery Service Rates under ICC Jurisdiction. https://web.archive.org/web/20251112/https://www.icc.illinois.gov/docket/P2024-0181

[40] PJM Manual 18 – Capacity Market Overview, §1.2 “Role of PJM,” p. 5. https://web.archive.org/web/20251112/https://www.pjm.com/library/manuals.aspx

[41] PJM Capacity Market Fact Sheet – “Promoting Future Reliability,” Base Residual Auction (BRA). https://web.archive.org/web/20251112/https://www.pjm.com/-/media/DotCom/about-pjm/newsroom/fact-sheets/pjm-capacity-market-promoting-future-reliability-fact-sheet.pdf

[42] FERC Order No. 719 – Wholesale Market Design and Reliability Principles, p. 6 ¶12. https://web.archive.org/web/20251112/https://www.ferc.gov/sites/default/files/2020-05/E-16_19.pdf

[43] State of the Market Report for PJM 2023, Volume 1, p. 15, Figure 3. https://web.archive.org/web/20251112/https://www.monitoringanalytics.com/reports/PJM_State_of_the_Market/2023.shtml

[44] PJM Generation Deactivation Fact Sheet, Table: Deactivations 2023–2027. https://web.archive.org/web/20251112/https://www.pjm.com/-/media/DotCom/about-pjm/newsroom/fact-sheets/generation-deactivation-fact-sheet.pdf

[45] 2026/2027 PJM BRA Planning Period Parameters, p. 2 (IRM ~19%). https://web.archive.org/web/20251015/https://www.pjm.com/-/media/DotCom/markets-ops/rpm/rpm-auction-info/2026-2027/2026-2027-planning-period-parameters-for-base-residual-auction-pdf.pdf

[46] NERC Long-Term Reliability Assessment (LTRA), 2024, p. 26 – ELCC by Resource Class. https://web.archive.org/web/20251112/https://www.nerc.com/pa/RAPA/ra/Pages/default.aspx

[47] PJM 2024 Load Forecast Report, p. 8 – Non-Coincident Peak Load Growth. https://web.archive.org/web/20251112/https://www.pjm.com/-/media/DotCom/library/reports-notices/load-forecast/2024-load-report.pdf

[48] 2026–2027 Base Residual Auction Report, p. 4 – Supply vs. Demand Balance. https://web.archive.org/web/20251112/https://www.pjm.com/-/media/DotCom/markets-ops/rpm/rpm-auction-info/2026-2027/2026-2027-bra-report.pdf

[49] Utility Dive – “PJM Auction Clears at Record Price Amid Reliability Concerns,” May 15, 2024. https://web.archive.org/web/20251112/https://www.utilitydive.com/news/pjm-capacity-auction-2026-2027/716812/

[50] (Removed – unused in final text)

[51] PJM Manual 28 – Billing, Settlements, and Credit Requirements, §2.3 “Locational Cost Allocation,” p. 12. https://web.archive.org/web/20251112/https://www.pjm.com/-/media/documents/manuals/m28.ashx

[52] Public Act 103-0721 – SB 3104 (Clean and Reliable Grid Act), Sec. 5 – Repeal of Nuclear Moratorium. https://web.archive.org/web/20251112/https://www.ilga.gov/legislation/publicacts/fulltext.asp?Name=103-0721

[53] ICC Docket 24-0181 – ComEd Multi-Year Rate Plan (2024–2027), Order pp. 142–143. https://web.archive.org/web/20251112/https://www.icc.illinois.gov/docket/P2024-0181

[54] FERC Order No. 1920 – Transmission Planning and Cost Allocation, Appendix A. https://web.archive.org/web/20250920/https://www.ferc.gov/media/e-1

[55] Citizens Utility Board – “Update on Cases Involving ComEd and Ameren Illinois,” June 28, 2024. https://web.archive.org/web/20240628170000/https://www.citizensutilityboard.org/blog/2024/06/28/update-on-cases-involving-comed-ameren-illinois-power-bills/

[56] PJM Manual 14A – Generator & Transmission Interconnection Process, §10.2 “Cost Responsibility,” p. 46. https://web.archive.org/web/20251112/https://www.pjm.com/-/media/documents/manuals/m14a.ashx

[57] 83 Ill. Adm. Code Part 466 – Electric Utility Interconnection Standards, § (b)(3). https://web.archive.org/web/20251112/https://www.ilga.gov/commission/jcar/admincode/083/08300466sections.html

[58] ICC Staff Brief on Exceptions, Docket 24-0181 (Cons. 22-0486 / 23-0055), p. 56 ¶3. https://web.archive.org/web/20251112/https://www.icc.illinois.gov/docket/P2024-0181/documents/352943/files/617754.pdf

[59] ComEd Filing #620670 – Kormos Testimony, Docket 24-0181 (July 2024), p. 9. https://web.archive.org/web/20251112203536/https://www.icc.illinois.gov/docket/P2024-0181/documents/354434/files/620670.pdf

[60] SB 2181 (2025) – Data Center Energy & Water Reporting; HB 4120 – Utilities-Various. https://web.archive.org/web/20251112/https://www.ilga.gov/legislation/BillStatus.asp?DocNum=2181&GAID=18&DocTypeID=SB&SessionID=114&LegID=161884

[61] NERC Standard EOP-011-2 – Emergency Operations, R1.1. https://web.archive.org/web/20251112/https://www.nerc.com/_layouts/15/PrintStandard.aspx?standardnumber=EOP-011-2

[62] ComEd Current Rate Book – Interruptible Service (IS) & Load Response (LR), Sheet 271. https://web.archive.org/web/20251112/https://www.comed.com/SiteCollectionDocuments/MyAccount/MyBillUsage/CurrentRateBook.pdf

[63] EIA FAQ – Average Monthly Electric Consumption per U.S. Household. https://web.archive.org/web/20251112/https://www.eia.gov/tools/faqs/faq.php?id=97&t=3

[64] 2026/2027 PJM Planning Period Parameters, p. 2 (IRM). https://web.archive.org/web/20251015/https://www.pjm.com/-/media/DotCom/markets-ops/rpm/rpm-auction-info/2026-2027/2026-2027-planning-period-parameters-for-base-residual-auction-pdf.pdf

[65] PJM 2025 Long-Term Load Forecast Report, pp. 12–14 (ComEd Zone & data center adjustments). https://web.archive.org/web/20251112/https://www.pjm.com/-/media/DotCom/library/reports-notices/load-forecast/2025-load-report.pdf

[66] Monitoring Analytics – “Analysis of the 2026/2027 RPM Base Residual Auction (Part A),” Oct. 1, 2025. https://web.archive.org/web/20251112/https://www.monitoringanalytics.com/reports/Reports/2025/IMM_Analysis_of_the_20262027_RPM_Base_Residual_Auction_Part_A_20251001.pdf

[67] PJM ELCC Class Ratings for 2024/2025 and 2025/2026. https://web.archive.org/web/20250930094019/https://www.pjm.com/-/media/DotCom/planning/res-adeq/elcc/elcc-class-ratings-for-2024-2025.ashx
November 18, 2025
What Data Centers Actually Mean for Northern Illinois Communities
Meta’s DeKalb, Illinois data center campus. Source: Meta.

AI tools were used in the research, drafting, and editing of this article. All factual claims are sourced to primary documents and verified by the author.

A fact-checked look at taxes, water, power, and local control

TL;DR: Data-center projects along I-88 have added hundreds of millions in new taxable value – about $200 million in 2024 alone – helping local governments cut tax rates around 20 % while expanding services. Modern campuses use hybrid cooling that cuts water use ~80 %, and Illinois’ grid – increasingly powered by nuclear and renewables – keeps them largely carbon-free. Every project operates under local water caps, noise rules, and open-record laws that ensure community control.

The more technical deep dives on electricity and property taxes are linked below.

A Region in Transition

Cornfields along I-88 have rapidly transformed into billion-dollar data-center campuses. That pace of change has sparked valid questions: Will they drain our water? Overload the grid? Take over farmland or raise taxes?

Those are fair questions – and the public record already has the answers. Northern Illinois’ filings, maps, and grid documents reveal what’s really happening when digital infrastructure moves in.

What Growth Really Means

DeKalb’s experience offers the clearest picture. County parcel records show hundreds of millions of dollars in new equalized-assessed value (EAV) added since Meta began construction on Gurler Road [1][2]. In 2024 alone, more than $200 million was added to the rolls [2].

That growth allowed the city and park district to cut property-tax rates by roughly 20 % while still expanding services [5]. District 428 used its more substantial base to fund new early-childhood and special-education programs [6][7].

EAV growth comparison: parcels near Meta’s DeKalb campus vs. the broader county. Source: DeKalb County parcel records.

Even homes directly across from the Meta campus have seen an increase in assessed value, while 2024 tax bills fell, indicating that the project hasn’t depressed nearby property values [3][4].

A campus on the order of ~50 acres – like Batavia’s current proposal – can generate the property-tax revenue of an entire subdivision while producing only a fraction of the traffic and city-service demand [8]. When abatements expire, that value remains for decades – permanently strengthening local finances.

Enterprise-Zone transparency: DeKalb’s enterprise-zone agreements grant 20-year, 55 % property-tax abatements tied to large capital investment and local-jobs targets. Full revenues ramp up over time, but once the abatements phase out, the EAV stays on the rolls [38].

Water: Separating Facts from Fears

The biggest misconception is water use. Modern data centers rely on closed-loop and hybrid chillers that reuse the same water repeatedly, drawing only small top-offs during the hottest weather.

“These systems use ~80 % less water than older cooling towers.” – U.S. Department of Energy, 2024 [9]

Yorkville’s Project Cardinal, for example, is capped near 350,000 gpd across ~1,100 acres – roughly one-quarter the water per acre of a typical subdivision [10]. Batavia’s pending project is limited to only 1,000 gallons per day [8].

Some cities are even exploring non-potable water sources – reusing treated or reclaimed water that would otherwise be discharged – thereby eliminating nearly all impact on household supplies.

Meta, for its part, has pledged to be water-positive by 2030 – restoring more water to local watersheds than it consumes [11][12].

Quick Compare ▶ Water and Land Efficiency

Water use per acre
- Typical subdivision: ~4,000–5,000 gallons per day
- Modern data center: ≈ 1,000 gpd
- Bataviadata center: ≈ 1,000 gpd total for the Batavia project [8]
Land use for value
- Typical subdivision: ≈ 500 acres per $1 billion in taxable value
- Modern data center: ≈ 50 acres per $1 billion EAV
- Utility solar farm: ≈ 2,000 acres per $0.25–0.3 billion in assets [28][29]
Power: How the Grid Actually Works

Northern Illinois isn’t an island; ComEd sits inside PJM’s 13-state grid stretching from Illinois to the East Coast [13]. PJM balances supply and demand every few minutes through its real-time market [14].

Adding a data center load here doesn’t destabilize the grid – it keeps jobs, the tax base, and infrastructure investment in our region, instead of somewhere else.

Large users also help finance reliable generation. Meta’s 20-year carbon-free agreement with Constellation keeps the Clinton nuclear plant operational [15], while Amazon and others have similar long-term clean energy contracts. The same nuclear facilities that serve data centers also stabilize wholesale prices for every Illinois ratepayer.

PJM Interconnection transmission zones. ComEd (purple, upper left) covers northern Illinois. Source: PJM.com

Illinois’ Clean and Reliable Grid Affordability Act now allows new nuclear development to begin in 2026 [16][17], reflecting confidence that steady baseload power complements renewables.

Even Naperville’s current proposal – still under review after public debate – shows how local oversight and state-level policy align to manage growth responsibly [18][19].

How Communities Manage Growth

Across Northern Illinois, cities are shaping development on their own terms:
- DeKalb has approved some projects and denied others – including a 2025 “boutique” data center and solar proposal on Peace Road that failed twice before the City Council [37].
- Batavia capped water use at 1,000 gallons per day (gpd) and oversees the project through its municipal utility [8].
- Yorkville & Plano require developers to fund all road, water, and utility extensions before annexation [32].
- Rochelle has hosted data centers for more than a decade under its Rate 163 tariff, using local generation to stabilize customer rates [20][21].
- Aurora enacted a temporary moratorium in Sept 2025 to update design and noise standards [22][23].
- Naperville already operates several small facilities quietly within its business parks [18][19].
Different paths, same outcome: clear expectations, transparent review, and measurable community benefit.

Farmland and Land Use

Illinois loses far more farmland to low-density residential sprawl than to any other type of development [27]. Modern data-center campuses are land-efficient – often only a few dozen acres per billion dollars of taxable value.

By comparison, solar facilities like the Burr Oak Solar Project occupy approximately 2,000 acres for a capacity of roughly 200 MW – 5 to 10 acres per MW [28][29]. Concentrating high-value, low-impact uses near existing transmission and fiber corridors helps preserve thousands of acres elsewhere for agriculture.

Transparency and Trust

Healthy skepticism makes communities stronger. Illinois’ Open Meetings and Freedom of Information Acts guarantee that local records are public [30][31]. Yorkville goes further, requiring an independent engineering review and continuous noise monitoring throughout each data center build [32][33].

Open processes like these keep the conversation anchored in verifiable facts rather than speculation.

Managing Construction and Operation

Construction brings trucks and dust – that’s why Illinois’ Construction General Permit (ILR10) and local ordinances regulate work hours, runoff, and haul routes [24].

Once operating, these facilities are tranquil. Backup generators are tested briefly each month under Illinois EPA permits that limit total runtime [25]. Landscaping, berms, and shielded lighting make them unobtrusive neighbors.

Shared Benefits and a Path Forward

Meta’s DeKalb campus alone has provided over $1 million in community grants to local schools and nonprofits [26]. Beyond those visible donations are quieter gains: modernized substations, stronger broadband routes, and more resilient municipal budgets.

Handled responsibly, data-center growth strengthens the very systems every resident relies on. Northern Illinois can either lead this balanced progress – or watch the investment migrate elsewhere. Let the data guide that choice.

Methods & Transparency

I utilize a range of AI and automation tools, in conjunction with my own research, to organize and verify complex public data – from DeKalb County tax rolls and DevNet parcel records to PJM TEAC maps and ComEd reliability filings. ChatGPT has been the primary workhorse for synthesis, but I also utilize Copilot, Gemini, Claude, and Grok to cross-check facts, refine tone, and develop Python-based tools for analysis. Grammarly keeps the writing clear – I use it for nearly everything I write, even texts.

Over the past several months, I’ve invested well over 100 hours reviewing, verifying, and refining this information. I have also permanently archived more than 100 key source documents in the Internet Archive’s Wayback Machine to ensure transparency and durability. The work is still ongoing as new filings and community feedback come in.

Every figure and citation is sourced from public records that you can verify independently. My goal is to make complex infrastructure and taxation topics accessible and understandable to everyone in the community. I’m just a local guy with a day job and a family, trying to make the public data we already have a little easier for everyone to understand.

If you’d like a deeper, fully-sourced explanation of why electric bills rose statewide, how PJM Interconnection pricing actually works, and what role data centers do and don’t play in local rates, see: Why Electric Bills Really Rose, and What It Means for Data Centers

For the full breakdown of how EAV growth, levy decisions, and data-center contributions combine to affect property tax bills in DeKalb County, see: How Meta’s Data Center Affected DeKalb County Property Taxes (2020–2024)

Sources & Archives (38 total)

(All permanently archived via web.archive.org)

This article is part of the Data Centers: The Public Record series. View all technical analysis →

1 – DeKalb Co. parcel 08-35-300-010 (2024) – Meta Ventus campus assessment. https://web.archive.org/web/20251102183338/https://dekalbil.devnetwedge.com/parcel/view/0835300010/2024

2 – City of DeKalb FY 2024 Tax Levy Memo (11-12-2024). https://web.archive.org/web/20241123035712/https://cityofdekalb.com/AgendaCenter/ViewFile/Agenda/_11122024-2614

3 – DeKalb parcel 11-032-000-66 (2021). https://web.archive.org/web/20251102224656/https://dekalbil.devnetwedge.com/parcel/view/1103200066/2021

4 – DeKalb parcel 11-032-000-66 (2024). https://web.archive.org/web/20251102224710/https://dekalbil.devnetwedge.com/parcel/view/1103200066/2024

5 – DeKalb Park District 2025 Tax Levy Estimate & Rate History. https://web.archive.org/web/20251102171237/https://dekalbparkdistrict.community.highbond.com/document/13a4a189-cf56-4454-938f-ba9ef5a28ade

6 – DeKalb CUSD 428 Early Learning Center Plan (2024). https://web.archive.org/web/20251103185226/https://go.boarddocs.com/il/dist428/Board.nsf/files/DMHQ9K683A17/$file/vision%20FOR28%20(2).pdf

7 – Shaw Local (10-29-2025). https://web.archive.org/web/20251103184920/https://www.shawlocal.com/daily-chronicle/2025/10/29/dekalb-school-district-428-moves-forward-without-referendum-on-early-learning-center-plans/

8 – City of Batavia Data Center Project (Hut 8). https://web.archive.org/web/20251102235655/https://il-batavia.civicplus.com/1248/City-of-Batavia-Data-Center-Project

9 – U.S. DOE (2024) Best Practice Guide for Data Center Design §5.3. https://web.archive.org/web/20250918212357/https://www.energy.gov/sites/default/files/2024-07/best-practice-guide-data-center-design_0.pdf

10 – Shaw Local (9-9-2025). https://web.archive.org/web/20251103141227/https://www.shawlocal.com/kendall-county-now/2025/09/09/yorkville-says-higher-water-bills-not-related-to-data-centers-but-higher-water-consumption-linked/

11 – Meta Sustainability Blog (2023) “What Does It Mean to Be Water-Positive.” https://web.archive.org/web/20251103011415/https://sustainability.atmeta.com/blog/2023/03/15/what-does-it-mean-to-be-water-positive/

12 – Meta Sustainability Blog (2023) “Our Journey to Water-Positive 2030.” https://web.archive.org/web/20251103011510/https://sustainability.atmeta.com/blog/2023/03/01/metas-edward-palmieri-shares-our-journey-to-achieve-water-positive-status-by-2030/

13 – PJM Territory Served / ComEd Zone Map (2024). https://web.archive.org/web/20250107193805/https://www.pjm.com/-/media/about-pjm/pjm-zones.ashx

14 – PJM Real-Time Energy Market Overview. https://web.archive.org/web/20251103191200/https://www.pjm.com/markets-and-operations/energy/real-time

15 – Constellation + Meta (2025) Clean-Energy Agreement. https://web.archive.org/web/20251015123245/https://www.constellationenergy.com/newsroom/2025/constellation-meta-sign-20-year-deal-for-clean-reliable-nuclear-energy-in-illinois.html

16 – Illinois Public Act 103-1079 (2025). https://web.archive.org/web/20251103193011/https://www.ilga.gov/legislation/publicacts/103/103-1079.htm

17 – Capitol News Illinois (10-2025). https://web.archive.org/web/20251103142417/https://capitolnewsillinois.com/news/lawmakers-ok-sweeping-energy-reform-package-that-governor-pledges-to-sign/

18 – NetSource Data Center Naperville. https://web.archive.org/web/20251022105043/https://www.netsource.com/web-hosting/chicago-datacenter/

19 – Daily Herald (10-17-2025). https://web.archive.org/web/20251102234708/https://www.dailyherald.com/20251017/news/developer-revises-data-center-plans-naperville-residents-still-concerned/

20 – City of Rochelle 2022 Utility Audit. https://web.archive.org/web/20251102173834/https://www.cityofrochelle.net/~documents/department-documents/finance/audits/22-final-audit-utilities-co-rochelle/?layout=file

21 – Rochelle Municipal Utilities Rate 163 Tariff. https://web.archive.org/web/20251104115335/https://www.rmu.net/wp-content/uploads/Rate-163.pdf

22 – City of Aurora Moratorium Page (2025). https://web.archive.org/web/20251102174548/https://www.aurora.il.us/Property-and-Business/Zoning-and-Planning/Data-Center-and-Warehouse-Moratorium

23 – City of Aurora Ordinance O25-064 (9-2025). https://web.archive.org/web/20251102174840/https://www.aurora.il.us/files/sharedassets/mainsite/v/1/environment/documents/o25-064.pdf

24 – Illinois EPA Construction General Permit (ILR10). https://web.archive.org/web/20251031193052/https://epa.illinois.gov/topics/forms/water-permits/storm-water/general-permits.html

25 – Illinois EPA Air Permit Generator Runtime Limits (2023). https://web.archive.org/web/20251103180322/https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/ira-analyses/031063AUJ%2023050030.pdf

26 – Meta Data Centers Community Grant Recipients 2021–2025. https://web.archive.org/web/20251102175450/https://datacenters.atmeta.com/2025-grant-recipients/

27 – farmdoc daily (8-2024) “Agricultural Land Lost to Development in the Midwest.” https://web.archive.org/web/20251102175731/https://farmdocdaily.illinois.edu/2024/08/agricultural-land-lost-to-development-in-the-midwest.html

28 – NREL (2013) Land-Use Requirements for Solar Power Plants in the U.S. https://web.archive.org/web/20251103180535/https://docs.nrel.gov/docs/fy13osti/56290.pdf

29 – Burr Oak Solar Project Overview. https://web.archive.org/web/20251102231740/https://burroaksolar.com/

30 – Illinois Open Meetings Act (5 ILCS 120). https://web.archive.org/web/20250918044223/https://www.ilga.gov/legislation/ilcs/ilcs3.asp?ActID=84&ChapterID=2

31 – Illinois Freedom of Information Act (5 ILCS 140). https://web.archive.org/web/20250918044314/https://www.ilga.gov/legislation/ilcs/ilcs3.asp?ActID=85&ChapterID=2

32 – City of Yorkville Development Standards Text Amendment. https://web.archive.org/web/20250612210415/https://www.yorkville.il.us/915/Data-Center-Development-Standards-Text-A

33 – City of Yorkville Project Steel Page (Noise Docs). https://web.archive.org/web/20251029220340/https://www.yorkville.il.us/905/Project-Steel-Data-Center-Campus-Annex-A

34 – City of Yorkville Council Packet (8-26-2025). https://web.archive.org/web/20251103181453/https://www.yorkville.il.us/ArchiveCenter/ViewFile/Item/6403

35 – City of Yorkville Council Packet (10-28-2025). https://web.archive.org/web/20251030025207/https://www.yorkville.il.us/ArchiveCenter/ViewFile/Item/6480

36 – NOAA / NCEI Illinois Billion-Dollar Disasters Summary (2024). https://web.archive.org/web/20250804110522/https://www.ncei.noaa.gov/access/billions/state-summary/IL

37 – Shaw Local (9-24-2025) “Vote on ‘Boutique’ DeKalb Data Center, Solar Development Fails Again.” https://web.archive.org/web/20250925140312/https://www.shawlocal.com/daily-chronicle/2025/09/24/vote-on-boutique-dekalb-data-center-solar-development-fails-again/

38 – DCEDC (2025) DeKalb County Enterprise Zone Incentives Summary. https://web.archive.org/web/20251104120025/https://dcedc.org/wp-content/uploads/2025/09/Enterprise-Zone-Incentives.pdf
November 3, 2025