| Max Environmental -- Yukon Facility | Yukon | 496.1k |
| Saint Nicholas Cogeneration Project | Shenandoah | 51.4k |
| Panther Creek Power Operating Llc | Nesquehoning | 6.9k |
| Keystone Power Plant | Shelocta | 5.0k |
| Mount Carmel Cogen Facility | Marion Heights | 4.5k |
| Cleveland-Cliffs Steel Corp /Butler Works | Butler | 2.6k |
| Conemaugh Generating Station | New Florence | 1.6k |
| Uss Mon Valley Works - Edgar Thomson Plant | Braddock | 1.0k |
| Sharon Coating Llc | Sharon | 625 |
| Ward Manufacturing Llc | Blossburg | 537 |
| Ardagh Glass Inc | Port Allegany | 516 |
| Befesa Zinc Us Inc. | Palmerton | 481 |
| Brunner Island Steam Electric Station | York Haven | 401 |
| Woodgrain Inc. | Wysox | 400 |
| Owens-Brockway Glass Container Inc Plant 19 | Brockport | 352 |
| Cleveland-Cliffs Plate Llc Coatesville Facility | Coatesville | 330 |
| Uss Mon Valley Works - Irvin Plant | West Mifflin | 317 |
| Pixelle Specialty Solutions Llc | Spring Grove | 310 |
| Ellwood Quality Steels Co | New Castle | 188 |
| Owens-Brockway Glass Container Inc Plant 18 | Brockway | 153 |
| Standard Steel Llc | Burnham | 143 |
| Calpine Mid Merit Llc York Energy Center | Delta | 122 |
| Magnesita Refractories Co | York | 118 |
| Libertas Copper Llc | Leetsdale | 114 |
| Hammond Lead Products | Pottstown | 114 |
| Ati Flat Rolled Products Llc-Latrobe Plant | Latrobe | 113 |
| Uss-Clairton Plant | Clairton | 89 |
| Yuasa Battery Inc. | Laureldale | 61 |
| Ati Flat Rolled Products Holdings Llc | Brackenridge | 56 |
| Tenaris Koppel | Koppel | 55 |
| Sunoco Llc-Race Fuels | Marcus Hook | 52 |
| Holcim (Us) Inc. - Whitehall Plant | Whitehall | 47 |
| Oldcastle Infrastructure | Telford | 46 |
| Lehigh White Cement Co Llc | York | 40 |
| Nlmk Pennsylvania Llc | Farrell | 37 |
| Zekelman Industries Co Dba Wheatland Tube Co-Council | Wheatland | 36 |
| J Walter Miller Co | Lancaster | 35 |
| Global Tungsten & Powders Llc | Towanda | 34 |
| Monroe Energy Llc-Trainer Refinery | Trainer | 27 |
| North American Hoganas | Hollsopple | 27 |
| Keystone Foundry Div | Erie | 25 |
| Flury Foundry Co | Lancaster | 20 |
| Asc Engineered Solutions - Fka Anvil International | Columbia | 20 |
| Cleveland-Cliffs Steelton Llc | Steelton | 18 |
| Montour Steam Electric Station | Danville | 17 |
| Unicast Co | Boyertown | 16 |
| Keystone Cement Co | Bath | 15 |
| Klein Plating Works Inc | Erie | 15 |
| Seward Power Plant | New Florence | 15 |
| New Jersey Shell Casting Corp | Marietta | 14 |
| Cleveland-Cliffs Monessen Coke Llc | Monessen | 12 |
| Buzzi Unicem Stockertown Plant | Stockertown | 11 |
| Northampton Generating Plant | Northampton | 11 |
| Kopp Glass Inc | Pittsburgh | 10 |
| Bridesburg Foundry Co | Whitehall | 9 |
| Greenville Metals Inc | Transfer | 8 |
| World Resources Co | Pottsville | 7 |
| Alpha Assembly Solutions | Altoona | 7 |
| Heidelberg Materials Us Cement Llc - Evansville | Fleetwood | 6 |
| Schott N.a. Inc | Duryea | 6 |
| Scrubgrass Generating Plant | Kennerdell | 6 |
| Collins Pine Co Kane Hardwood Sawmill | Kane | 6 |
| Gilberton Power Co | Frackville | 6 |
| Gautier Steel Holdings Inc. | Johnstown | 6 |
| Latrobe Specialty Metals | Latrobe | 6 |
| Penn Union Co. Llc | Edinboro | 5 |
| L&m Fabrication & Machine Inc. (South) | Bath | 4 |
| Gold Bond Building Products - Milton | New Columbia | 4 |
| Victaulic Co - Alburtis Facility | Alburtis | 4 |
| Rausch Creek Generation Llc | Tremont | 4 |
| United Refining Co | Warren | 4 |
| Vitro Flat Glass Llc Carlisle Plant | Carlisle | 4 |
| Cleveland-Cliffs Plate Llc Conshohocken Facility | Conshohocken | 3 |
| Leading Technologies Inc | Leechburg | 2 |
| Avient Corp | Bethlehem | 2 |
| Lehigh Specialty Melting Inc | Latrobe | 2 |
| Bear Metallurgical Co | Butler | 2 |
| Erie Forge & Steel Inc | Erie | 2 |
| Gold Bond Building Products - Shippingport | Shippingport | 2 |
| Prime Metals Acquisitions Llc | Homer City | 1 |
| Langeloth Metallurgical Co | Langeloth | 1 |
| Envirite Of Pennsylvania Inc | York | 1 |
| Oldcastle Precast Inc | Croydon | 1 |
| Whemco-Steel Castings Inc | Midland | 1 |
| Hoeganaes Corp | Watsontown | 1 |
| Us Gypsum Co | Aliquippa | 1 |
| American Refining Group Inc. | Bradford | 1 |
| Us Gypsum - Washingtonville Plant | Danville | 1 |
| Victaulic Co - Forks Facility | Easton | 1 |
| Global Advanced Metals Usa | Boyertown | 1 |
| Lehigh Heavy Forge Corp | Bethlehem | 1 |
| Westrock Converting Co Llc Stroudsburg Mill | Delaware Water Gap | 1 |
| Graymont (Pa) Inc. | Bellefonte | 1 |
| Amphenol Thermometrics Inc | Saint Marys | 1 |
| Boyertown Foundry Co | New Berlinville | 0 |
| Pennex Aluminum Co Llc | Greenville | 0 |
| Us Steel Fairless Hills Works | Fairless Hills | 0 |
| Precision Kidd Steel Co | West Aliquippa | 0 |
| Leonardo Drs - Laurel Technologies Ptnr | Johnstown | 0 |
| Steel Dynamics Inc. - Techs Div - Metaltech Plant | Pittsburgh | 0 |