True Power Systems delivers arc flash analysis, short-circuit studies, and coordination studies for Illinois manufacturing plants, food and pharmaceutical processing, data centers, municipalities, and healthcare institutions. PE-stamped and code-compliant.
Illinois Quick Facts
PE License
Active · State of Illinois
Standards
NFPA 70E · IEEE 1584 · IEEE 242 · ANSI C37 · OSHA 1910
Software Platforms
ETAP · EasyPower · SKM/PTW · CYMCAP
Illinois Services
All studies are performed by a licensed Professional Engineer, delivered with PE stamp, and compliant with NFPA 70E, IEEE 1584, and OSHA 29 CFR 1910.335 requirements.
NFPA 70E compliant arc flash studies with IEEE 1584-2018 calculations, equipment labeling, and PPE recommendations. Required for any Illinois facility where energized electrical work is performed.
NFPA 70E · IEEE 1584 · OSHA
Fault current calculations to verify equipment interrupting ratings are adequate. Required when adding new equipment, upgrading service, or when utility fault current levels have changed.
ANSI/IEEE · NFPA 70 NEC
Time-current curve analysis to ensure protective devices operate in the correct sequence. Critical for facilities with multiple sources, generators, or complex distribution systems.
IEEE 242 · NFPA 70
Power quality studies for facilities with VFDs, motor controls, or non-linear loads. Essential for Illinois wastewater treatment plants, manufacturing facilities, and data centers.
IEEE 519 · IEEE 1159
Steady-state power flow studies to identify voltage regulation issues and verify equipment loading. Critical for planning electrical infrastructure expansions and additions.
IEEE 399
Cable ampacity calculations for underground duct banks using CYMCAP, required for large commercial developments, utilities, and medium-voltage underground distribution projects in Illinois.
CYMCAP · Neher-McGrath
Illinois Markets
Potential Illinois Customer Base
Counts below are the total Illinois establishments per sector across the state — the universe of facilities that may need a power system study, not a TPS client list.
19,330
Manufacturing
580,325 workers
37,838
Healthcare & social assistance
874,612 workers
7,866
Educational services
552,423 workers
1,633
Data centers & hosting
16,009 workers
396,712 total Illinois establishments · Source: U.S. Bureau of Labor Statistics, Quarterly Census of Employment and Wages, 2024 annual averages
Power system studies and Master Service Agreements for Illinois cities, counties, and public agencies. Arc flash compliance for city halls, public works facilities, and transit authorities.
Harmonic analysis and arc flash studies for Illinois water and wastewater utilities. Experience with pump station electrical systems, VFD installations, and SCADA-integrated power distribution.
Arc flash, short-circuit, and coordination studies for Illinois manufacturing plants, food processing facilities, and heavy industrial operations. OSHA compliance documentation included.
Power demand analysis and complete power system studies for Illinois data centers and mission-critical facilities. Capacity planning, redundancy verification, and feasibility studies for new and expanding sites.
Arc flash studies and electrical engineering support for Illinois K-12 schools and universities. Coverage for classroom buildings, athletic facilities, and central plant electrical systems.
Engineering support for Illinois EV charging installations and renewable energy projects, including charger load studies, service capacity analysis, and utility interconnection support.
Illinois Power Landscape
Every power system study TPS delivers in Illinois accounts for the utilities, fault duties, and interconnection requirements specific to the state. This is the landscape our Illinois work sits in.
Illinois is split across two wholesale grid operators. Northern Illinois, served by ComEd, sits inside PJM Interconnection; central and southern Illinois, served by Ameren Illinois, fall under MISO. Cooperatives and MidAmerican Energy serve other pockets. The available fault current at a facility service is set by the serving utility, and it shifts when transformers or feeders are upgraded, which is why short-circuit and arc flash studies should be revisited after utility-side work.
Illinois operates an OSHA-approved state plan that covers public-sector employees only. Private-sector employers in Illinois answer to federal OSHA. Either way, enforcement runs through 29 CFR 1910 Subpart S, which treats NFPA 70E as the consensus standard for arc flash risk assessment and equipment labeling. A current, PE-sealed arc flash study is the documentation an OSHA inspector or an insurance auditor expects to see.
The authority having jurisdiction for the installation itself is typically the local or county electrical inspection office enforcing the National Electrical Code as adopted in Illinois. Every study True Power Systems delivers in the state is modeled to current IEEE and NFPA methodology and sealed by a Professional Engineer licensed in Illinois.
Regulatory & Grid Context
State Regulator
Illinois Commerce Commission
ICC
Wholesale Grid Operator
PJM Interconnection (northern Illinois) + MISO (central / southern Illinois)
Major Illinois Utilities
Illinois Industrial Corridors
Why TPS in Illinois
True Power Systems holds an active Professional Engineer license in the State of Illinois and serves facilities across the state, from the Chicago industrial corridor and data-center cluster to the Peoria heavy-equipment belt and the Quad Cities and Decatur food-processing operations. Our engineers model every study in ETAP, EasyPower, SKM/PTW, and CYMCAP to current code.
We are registered as a Veteran-Owned Small Business (VOSB) in SAM.gov, satisfying both private-sector and government contracting requirements for Illinois cities, counties, and public agencies.
What Every Study Includes
VOSB & Federal Credentials
UEI: H6HAZKAD4LJ7 · CAGE: 08E02
NAICS 541330 / 541690 / 238210
Active SAM.gov Registration
SDVOSB-eligible per 38 U.S.C. § 8127
Illinois FAQ
It depends on your workforce. Illinois's OSHA-approved state plan covers public-sector employees only, so private-sector employers in Illinois answer to federal OSHA. Both enforce electrical safety through 29 CFR 1910 Subpart S, which references NFPA 70E for arc flash risk assessment and equipment labeling.
If workers ever interact with energized equipment, such as troubleshooting, racking breakers, or voltage testing, NFPA 70E calls for an arc flash risk assessment and OSHA expects equipment to carry incident-energy labels. New equipment, a service upgrade, or a change in utility fault current all trigger a new or updated study.
Illinois is split: northern Illinois (ComEd) is in PJM, central and southern Illinois (Ameren) are in MISO, with MidAmerican Energy and cooperatives also serving the state. The fault current available at your service depends on which utility and grid area you sit in and changes when equipment is upgraded, so short-circuit and arc flash results should be re-checked after utility-side work.
A power system study used for compliance must be sealed by a Professional Engineer licensed in Illinois. True Power Systems holds an active Illinois PE license and stamps every Illinois deliverable.
A complete package covers incident-energy calculations and arc flash boundaries, ANSI Z535 equipment labels, short-circuit and equipment-duty evaluation, protective-device coordination, an as-studied one-line diagram, and a PE-sealed report.
Illinois Inquiries
Ready to get started on a Illinois power system study? Fill out the form and a TPS engineer will respond within one business day with a scope and fee proposal.
Contact TPS
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