| # | Facility | t of steel | t CO₂e/yr |
|---|---|---|---|
| 1 | ArcelorMittal Asturias (Aviles) steel plant | 4,200,000 | 3,891,500 |
| 2 | Celsa Barcelona Castellbisbal steel plant | 2,500,000 | 116,543 |
| 3 | ArcelorMittal Sestao steel plant | — | 315,452 |
| 4 | ArcelorMittal Olaberria-Bergara (Olaberria) steel plant | 1,450,000 | 75,369 |
| 5 | Grupo Gallardo Siderurgica Balboa Jerez de los Caballeros steel plant | 1,300,000 | 60,603 |
| 6 | Riva Siderurgica Sevillana steel plant | 1,300,000 | 60,603 |
| 7 | Acerinox Europa Los Barrios steel plant | — | 120,273 |
| 8 | ArcelorMittal Asturias (Gijón) steel plant | — | 1,822,038 |
| 9 | Celsa Nervacero steel plant | — | 46,617 |
| 10 | Celsa Global Steel Wire Santander plant | 750,000 | 34,963 |
| 11 | Sidenor Aceros Especiales Basauri steel plant | 740,000 | 34,497 |
| 12 | Megasa Siderúrgica Narón steel plant | 700,000 | 70,159 |
| 13 | Grupo Gallardo Corrugados Getafe steel plant | — | 27,970 |
| 14 | Megasider Zaragoza steel plant | — | 50,114 |
Climate TRACE v6 (asset-level capacity & CO₂e, CC BY 4.0).