Mesothelioma Lawyer Ohio: Asbestos Exposure at AEP Conesville Power Plant

For Workers, Former Employees, and Families Diagnosed with Mesothelioma or Asbestosis

If you or a family member worked at the AEP Conesville Power Plant in Coshocton County, Ohio and has since been diagnosed with mesothelioma, asbestosis, lung cancer, or another asbestos-related disease, you may have legal rights — including the ability to file a claim decades after your last day of work. An experienced asbestos attorney can help you pursue compensation before time runs out. Ohio’s statute of limitations for asbestos disease claims is 2 years from the date of diagnosis to file — missing that deadline means losing your right to recover permanently. This guide covers what workers at Conesville may have been exposed to, the diseases asbestos causes, and the legal options available to you right now.

Asbestos Exposure at Conesville: What You Need to Know

Facility Overview and Operational History

The Conesville Power Plant, located along the Muskingum River in Coshocton County, Ohio, was one of the largest coal-fired generating stations operated by American Electric Power (AEP) and its predecessor entities — primarily Columbus and Southern Ohio Electric Company (CSOE) and Ohio Power Company. The facility sits near Conesville, Ohio, approximately 70 miles northeast of Columbus.

Key operational facts:

Construction began in the 1950s, with Unit 1 reportedly coming online around 1957
Additional generating units were added through the 1970s
At peak operations, the plant generated over 2,000 megawatts across multiple boiler units
The plant employed hundreds of permanent workers plus large numbers of contract laborers, maintenance crews, and construction tradespeople — especially during scheduled outages
Units 1 through 4 were retired by around 2020; remaining units followed as AEP restructured coal generation operations
Multiple generations of workers across more than six decades may have been exposed to asbestos-containing materials during construction, operation, and maintenance

Why Asbestos-Containing Materials Were Used Throughout the Power Plant

Coal-fired generating stations run at extreme temperatures. Boilers, turbines, steam headers, feed-water heaters, and miles of high-pressure steam piping reach temperatures exceeding 1,000°F. For most of the twentieth century, asbestos-containing materials were the insulation product of choice because they offered:

Superior thermal resistance — naturally resistant to extreme heat
Fire retardancy — did not ignite in high-temperature environments
Tensile strength — provided durability in gaskets, packing materials, rope seals, and pressure components
Acoustic dampening — reduced vibration and noise in industrial machinery
Low cost — cheaper than alternatives before the health hazards became undeniable
Chemical resistance — held up under acids, steam, and chemical cleaners

Major manufacturers of asbestos-containing insulation products that heavily marketed to utilities included:

Johns-Manville — the dominant supplier of asbestos-containing pipe insulation and insulating cement
Owens-Corning and Owens-Illinois — manufacturers of calcium silicate pipe covering and block insulation
Armstrong World Industries — asbestos-containing gasket materials and insulation products
W.R. Grace — spray-applied asbestos-containing fireproofing and insulation
Combustion Engineering — boiler components and refractory products allegedly containing asbestos
Pittsburgh Corning — cellular glass insulation products
National Gypsum — asbestos-containing drywall and building materials
Keasbey & Mattison — 85% magnesia pipe insulation with asbestos reinforcement
Philip Carey — asbestos-containing pipe covering and thermal insulation
Fibreboard Corporation — asbestos-containing insulation and building products

When Exposure Risk Was Highest at Conesville

Construction and Initial Installation (1950s–1970s)

During original construction of Units 1 through 6, contractors and tradespeople may have been exposed to substantial quantities of asbestos-containing insulation during installation on:

Steam pipes, headers, and valves
Turbine casings and steam chests
Boiler surfaces, fireboxes, and ductwork
Structural fireproofing on steel support members
Floor tiles, ceiling tiles, and roofing materials

Asbestos-containing materials were routinely cut, sawed, mixed, and applied in ways that reportedly released heavy concentrations of airborne fibers.

Operational Maintenance (1960s–1980s)

Continuous maintenance throughout the decades of active operation may have involved:

Repairing and replacing gaskets and packing materials that failed under heat and pressure cycling
Stripping and re-insulating aging asbestos-containing pipe covering
Opening turbines for inspection and repair
Refractory repair and re-insulation on boilers

Removing old, deteriorating asbestos-containing pipe insulation reportedly generated fiber concentrations many times above dangerous levels.

Major Overhauls and Scheduled Outages (1970s–1990s)

Scheduled outages brought large numbers of contractor employees from Heat and Frost Insulators Local 1 and Plumbers and Pipefitters UA Local 562, along with other construction trades, on site simultaneously. Multiple trades worked in confined spaces performing grinding, cutting, demolition, and re-insulation work at the same time. When trades worked in close quarters simultaneously, asbestos fiber concentrations may have reached dangerous levels even for workers not directly handling asbestos-containing materials.

Environmental Compliance and Abatement (1980s–2000s)

As regulatory requirements tightened — including OSHA standards updates in 1972 and 1986 and EPA NESHAP regulations governing asbestos abatement — facilities like Conesville were required to identify and remove or encapsulate asbestos-containing materials (documented in NESHAP abatement records). Workers involved in abatement operations may have faced significant exposure risks even when prescribed protective equipment was in use, if removal procedures were not followed strictly.

Who Worked at Risk of Asbestos Exposure?

Job Titles and Trades with Greatest Exposure Risk

Insulators (Heat and Frost Insulators Local 1)

Insulators faced the most direct and concentrated potential exposure of any trade at facilities like Conesville. Their work may have involved:

Direct application, removal, and replacement of asbestos-containing pipe insulation products from Johns-Manville, Philip Carey, and other manufacturers
Installation and removal of block insulation and boiler coverings
Mixing and application of asbestos-containing insulating cement
Sawing asbestos-containing block insulation
Stripping friable asbestos-containing pipe covering — often reportedly without adequate respiratory protection before the mid-1970s

Pipefitters and Steamfitters (Plumbers and Pipefitters UA Local 562)

Pipefitters may have worked directly on steam systems throughout the plant, including:

Pulling back surrounding asbestos-containing insulation to access pipes for repair
Cutting and re-threading pipe
Replacing asbestos-containing gaskets and valve packing
Working alongside other trades simultaneously disturbing nearby insulated surfaces

Boilermakers

Boilermakers may have worked inside and immediately around massive boilers, performing:

Welding and cutting on boiler components surrounded by asbestos-containing insulation
Repairing boiler surfaces covered with asbestos-containing materials
Working with asbestos-containing refractory products allegedly lining internal combustion chambers

Electricians

Electricians may have encountered:

Asbestos-containing electrical panel insulation in control rooms and substations
Arc chutes with asbestos-containing components in electrical switchgear
Wire insulation and electrical cloth with asbestos content
Airborne fibers generated by nearby trades simultaneously disturbing asbestos-containing materials — so-called “bystander exposure”

Millwrights and Machinists

Millwrights may have worked on rotating equipment including turbines, pumps, and fans, with potential exposure including:

Turbine casings and steam chests insulated with asbestos-containing materials
Asbestos-containing gaskets throughout turbine and pump systems
Opening turbines for inspection and overhaul

Laborers and Maintenance Workers

General maintenance workers may have:

Swept and cleaned areas containing settled asbestos fibers
Dry-swept without respiratory protection — reportedly resuspending significant fiber quantities into breathing zones
Worked in active production areas during ongoing operations involving disturbed asbestos-containing insulation

Control Room Operators and Auxiliary Operators

Plant operators who routinely passed through or worked in boiler rooms, turbine rooms, and auxiliary areas may have encountered background asbestos fiber concentrations from aging, deteriorating insulation throughout the facility.

Construction Workers and Ironworkers

During original construction and expansion, workers may have encountered:

Asbestos-containing fireproofing allegedly sprayed on structural steel by contractors using W.R. Grace and competing products
High airborne fiber concentrations from spray-on application (spray-on asbestos-containing fireproofing was banned by the EPA in 1973)

Asbestos-Containing Products Allegedly Present at Conesville

Based on product types historically used at comparable coal-fired power plants of the same era, workers at Conesville may have encountered the following asbestos-containing materials:

Pipe Insulation and Block Insulation

85% Magnesia insulation reinforced with asbestos — manufactured by Keasbey & Mattison; workers may have been exposed during installation and removal
Calcium silicate pipe covering — many formulations sold through the 1970s allegedly contained asbestos
Asbestos-containing pipe covering — manufactured by Johns-Manville, Philip Carey, Fibreboard Corporation, Armstrong World Industries, and Owens-Corning; workers may have been exposed during installation, maintenance, and removal

Boiler and Refractory Products

Asbestos-containing boiler block and boiler covering — applied to exterior surfaces of boilers and steam drums; workers may have been exposed during application and repair
Asbestos-containing boiler insulation cement — reportedly used to seal insulation seams, with exposure risk during mixing and application
Asbestos-containing firebrick and castable refractory — allegedly lined the interior combustion chambers of boilers
Asbestos-containing boiler wrap and tape — products manufactured by Johns-Manville and others; workers may have been exposed during installation and removal

Gaskets, Packing, and Valve Components

Asbestos-containing valve packing and stem packing — used in steam and water valves throughout the plant; workers may have been exposed during valve maintenance and replacement
Asbestos-containing gasket materials — flanged connections on high-pressure steam lines throughout the facility; workers may have encountered these during routine pipe work and maintenance
Asbestos rope and braided rope seals — used as pump packing and mechanical seals; workers may have been exposed during installation and replacement
Asbestos-containing gasket sheets — cut and formed into custom gasket shapes on-site, reportedly releasing significant fiber quantities during cutting

Electrical and Panel Products

Asbestos-containing electrical panel insulation — in main control rooms and substation areas; workers may have been exposed during maintenance and repair
Asbestos-containing arc chutes — in electrical switchgear throughout the facility
Asbestos insulation jacketing on high-temperature wiring — used throughout the facility
Asbestos-containing electrical cloth tape

Fireproofing and Structural Materials

Spray-applied asbestos-containing fireproofing — allegedly applied to structural steel during original construction before the EPA ban in 1973; workers may have faced high exposure concentrations during original installation
Asbestos-containing spray-applied insulation — on steel framework and ductwork
Asbestos-containing wall and ceiling panels — in auxiliary buildings and control structures
Asbestos-containing floor tiles and ceiling tiles — installed throughout administrative and service areas; workers may have been exposed during installation, repair, and removal
Asbestos-containing roofing materials

Miscellaneous Products

Asbestos-containing high-temperature paint and coatings
**Asbestos