About A.J. Mihm Generating Station

A.J. Mihm Generating Station is a coal-fired power plant located in Michigan, operated as part of the regional electrical generation infrastructure. Like virtually every major power generation facility built or operated in the United States during the mid-twentieth century, Mihm was constructed during an era when asbestos-containing materials were the industry standard for thermal insulation, fireproofing, mechanical sealing, and equipment component manufacturing.

Power plants of this type typically included:

  • Large steam-generating boilers operating at extreme temperatures and pressures
  • Extensive turbine systems driving electrical generators
  • Miles of high-temperature steam and condensate piping
  • Mechanical and electrical control rooms
  • Cooling water systems and pumping infrastructure
  • Coal handling and ash handling systems

Under engineering standards prevailing from approximately the 1930s through the mid-1970s, each of these systems was routinely built using asbestos-containing materials that may have served as primary functional components.

A coal-fired power plant converts chemical energy into electrical energy through a thermodynamic cycle: water is heated under pressure to produce high-temperature, high-pressure steam; steam drives turbine blades at thousands of revolutions per minute; mechanical energy from turbines drives electrical generators; steam temperatures routinely exceeded 750°F to 1,000°F; and system pressures were measured in hundreds of pounds per square inch. Maintaining these temperatures and pressures efficiently — and safely — required exceptional thermal insulation. No synthetic material available during most of the twentieth century matched asbestos’s combination of properties: extreme heat resistance (chrysotile asbestos does not begin to degrade until approximately 932°F; amphibole varieties are stable at even higher temperatures), low thermal conductivity with outstanding insulating performance, mechanical flexibility (could be woven into fabric, mixed into cement, or compressed into boards and gaskets), resistance to chemical degradation, and low cost and wide availability.

During original construction, asbestos-containing materials are allegedly present throughout the facility, including boiler insulation blankets and block insulation, pre-insulated pipe sections with factory-applied asbestos-containing wrap, turbine insulation assemblies with asbestos-containing cladding, asbestos-containing floor tiles, ceiling tiles, and wallboard in control rooms and administrative areas, asbestos rope gaskets and compressed asbestos sheet gaskets throughout flanged pipe connections, and asbestos-containing spray fireproofing applied to structural steel. Throughout the operational life of the plant, ongoing maintenance activities are alleged to have involved continued use of asbestos-containing replacement parts and materials including replacement gaskets, packing, and rope seals; asbestos-containing insulation removed and re-applied during annual or semi-annual boiler outages; turbine overhauls involving disassembly and reassembly around asbestos-containing insulated components; and brake linings and clutch components on auxiliary mechanical equipment.

General Equipment at A.J. Mihm Generating Station

The equipment below represents the systems and infrastructure documented or typically present at this facility during the era when asbestos-containing materials were specified in industrial construction. This is general facility-equipment reference — not a legal attribution of any specific product, manufacturer, or exposure event to this facility. Material-category and manufacturer information is addressed in the AsbestosIndex Product Crosswalk linked under the records table below.

Boilers View crosswalk › Steam Turbines View crosswalk › Steam Traps View crosswalk › Condensers View crosswalk › Feedwater Heaters View crosswalk › Cooling Towers View crosswalk › Pipe Insulation View crosswalk › Block Insulation View crosswalk › Refractory Lining View crosswalk › Valves View crosswalk › Gaskets View crosswalk › Pumps View crosswalk ›

Documented Asbestos Evidence

The records below are verified, state-documented asbestos removals at this facility. Each entry represents a regulated abatement project where the Michigan EGLE (Environment, Great Lakes & Energy) (Michigan EGLE) was notified under federal NESHAP rules, the work was logged, and the asbestos-containing material was confirmed and removed under regulated conditions. These are not allegations or estimates — they are paper records tying documented asbestos-containing material to this specific site.

No Michigan EGLE NESHAP abatement notifications have been identified for this facility in current public records. Per the framing above, absence of state-agency documentation should not be read as absence of asbestos — only as absence of a formal, regulated abatement event meeting reporting thresholds. Workers who recall encountering pipe insulation, block insulation, gaskets, or other asbestos-era construction materials at this facility may still have viable claims regardless of whether a state record exists.

Material Categories in Documented Records

The materials documented above (and similar asbestos-containing materials commonly encountered in records of this type) appear in the AsbestosIndex catalog with historical manufacturer and trust-fund information. Click a category to view manufacturers historically associated with that material:

Thermal System Insulation View crosswalk › Asbestos-Cement Board View crosswalk › Pipe Insulation View crosswalk › Roofing & Flashing View crosswalk › Spray Fireproofing View crosswalk › Floor Tile & Mastic View crosswalk › Ceiling Tile View crosswalk › Gaskets & Packing View crosswalk ›

Who May Have Been Exposed at A.J. Mihm Generating Station

If you worked at A.J. Mihm Generating Station in Michigan — as an insulator, pipefitter, boilermaker, turbine technician, electrician, operator, or general laborer — you may have been exposed to asbestos-containing materials decades ago.

Workers at facilities like A.J. Mihm were not working around asbestos-containing materials incidentally — they were working in an environment engineered to incorporate those materials at every thermal boundary, every mechanical seal, and every fireproofed structural element. Missouri and Illinois union members who may have performed outage and maintenance work at Mihm typically carried product asbestos exposure histories that mirror what occupational health researchers have documented at comparable Mississippi River corridor facilities. Members of Heat and Frost Insulators Local 1 (St. Louis, Missouri), UA Local 562 (St. Louis, Missouri), and Boilermakers Local 27 (St. Louis, Missouri) are among the tradespeople whose work histories may include asbestos exposures at Michigan facilities including Mihm, alongside Missouri and Illinois plant work.

Critical Filing Deadline & Next Steps

Michigan law gives mesothelioma and asbestos-disease claimants 3 years from the date of medical diagnosis to file a personal-injury lawsuit (MCL § 600.5805(13)). For wrongful-death claims after an asbestos-related death, the filing window is 3 years from the date of death (MCL § 600.5852). The two deadlines run on separate tracks — preserving one does not extend the other.

The personal-injury clock runs from diagnosis, not from exposure. Mesothelioma latency is typically 20 to 50 years, so workers exposed in the 1950s–1980s are being diagnosed today.

Practical first steps

  1. Document what you remember. Pay stubs, W-2s, union cards, photographs, coworker names, and dates of employment. The WorkChain widget on this page can save a copy you can email yourself.
  2. Preserve medical records. Pathology reports, biopsy results, imaging, and pulmonary-function tests are central to both civil claims and trust-fund filings.
  3. Identify household members. Spouses who laundered work clothing and children of plant workers are eligible for secondary-exposure claims when diagnosed with an asbestos-related disease.
  4. Speak with an asbestos attorney with Michigan experience. The first conversation is free and confidential. Asbestos trust-fund claims and civil claims run on different tracks — both can be pursued in parallel.

Asbestos-Related Diseases

Asbestos fiber exposure can cause several specific diseases that typically appear decades after the original exposure. The latency period — the gap between exposure and diagnosis — usually runs 20 to 50 years. That's why workers exposed in the 1960s, 1970s, and 1980s are receiving diagnoses today.

Mesothelioma

A rare, aggressive cancer that affects the lining of the lungs (pleural mesothelioma), abdomen (peritoneal), or heart (pericardial). Mesothelioma is almost exclusively caused by asbestos exposure, which is why a mesothelioma diagnosis often points directly to historical workplace exposure. Average latency from first exposure to diagnosis is 30-50 years.

Asbestosis

A chronic, non-cancerous scarring of lung tissue caused by inhaled asbestos fibers. Asbestosis causes progressive shortness of breath, persistent cough, and reduced lung function. It does not improve with treatment, and it is a recognized basis for compensation under most trust schedules and civil claims.

Lung Cancer

Asbestos exposure significantly increases the risk of lung cancer, particularly when combined with a history of smoking. Asbestos-related lung cancer is compensable under the same trust schedules and civil claim avenues as mesothelioma.

Other Recognized Diseases

Pleural plaques, pleural thickening, laryngeal cancer, ovarian cancer, and certain gastrointestinal cancers are also recognized as asbestos-related under various trust schedules and case-law authorities, though eligibility and proof requirements vary by claim type.

If you have any of these diagnoses and you worked at this facility, lived with someone who did, or were exposed in any documented capacity, you may have a claim worth pursuing. Speak with an attorney before assuming you don't qualify.

Cross-State & Regional Corridor Workers

While A.J. Mihm Generating Station is located in Michigan, many of the workers, contractors, tradespeople, and union members who may have worked at this facility over the course of their careers traveled extensively across the Mississippi River industrial corridor — the dense belt of power generation, petrochemical, steel, and manufacturing facilities running from Alton, Illinois and Granite City, Illinois through St. Louis, Missouri and south along both banks of the Mississippi River.

This corridor produced some of the heaviest concentrations of industrial asbestos use in the United States. Workers based out of Missouri and Illinois union locals routinely traveled to facilities in Michigan, Ohio, Indiana, and Kentucky for outage work, construction projects, and specialty maintenance assignments. A pipefitter member of UA Local 562 (St. Louis) or an insulator from Heat and Frost Insulators Local 1 might work at Mihm one season and at the Labadie Energy Center or Portage des Sioux Power Plant the next. A boilermaker from Boilermakers Local 27 might have accumulated asbestos exposures across dozens of facilities over a 30-year career.

This career-spanning exposure pattern matters enormously for Missouri and Illinois residents for three reasons:

  1. Asbestos disease is cumulative — exposures at multiple facilities over time contribute to a single disease process
  2. Missouri and Illinois courts have recognized that multi-site asbestos exposure histories support claims against manufacturers who supplied asbestos-containing materials to multiple facilities
  3. Missouri residents diagnosed with mesothelioma or asbestosis may have legal claims arising from work at Mihm as well as from work at Missouri and Illinois facilities — and can pursue those claims simultaneously

Data Sources

Information about facility equipment, industrial materials, and occupational records referenced on this page is drawn from publicly available sources where applicable, including:

If specific equipment or product claims in this article are sourced from a non-public database, the source is identified parenthetically within the text above.