EPA GHGRP · state profile · MD
Maryland - lower-footprint state profile
According to the EPA's Greenhouse Gas Reporting Program (GHGRP), a smaller state total: 17.5M MT CO₂e across 77 reporting facilities in MD.
- among states
- #37
- Total CO₂e - Large emitter
- 17.5M MT
- Facilities
- 77
- Companies
- 42
- Avg / facility - High intensity
- 227K MT
Data updated May 2026
Maryland reports 17.5M MT CO₂e from 77 EPA GHGRP facilities and 42 parent companies (#37 of 54 U.S. states by aggregated facility CO₂e), led by HEIDELBERG MATERIALS US CEMENT at 1.9M MT (~11% of the state total).
- #37 of 54 states
- HEIDELBERG MATERIALS US CEMENT 10.6% of state
- 0.7% of U.S. GHGRP total
- Avg 227K MT per facility · May 2026
Dispersed in-state reporter mix
HEIDELBERG MATERIALS US CEMENT is the largest single reporter at 10.6% of Maryland CO₂e (1.9M MT), but the top three still account for only 29.6% across 42 parent companies. Shares use EPA GHGRP facilities sited in MD only, not each parent's company-wide total.
- Maryland is 0.7% of the 2.57B MT U.S. GHGRP facility rollup across 54 jurisdictions.
- Leading EPA sector by CO₂e: Power Plants at 50.1% (8.8M MT across 24 facilities) - orthogonal to the facility-count sector mix below.
- Trails Montana by 800K MT on the same state ranking.
- Leads Alaska by 15K MT on the same state ranking.
Maryland vs all states by reported GHGRP CO₂e
Where this state's aggregated facility Scope 1 sits among every state and territory in the EPA GHGRP file (readout in million MT)
18 37th of 54 higher than 17 of 54 states
States and territories, banded by total reported facility CO₂e (MT)
Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA Greenhouse Gas Reporting Program · May 2026
Facility mix · EPA sector count
How 77 Maryland facilities split by EPA sector
Exclusive in-state facility counts by EPA industry_sector, orthogonal to the leading-parent CO₂e share lens above. Source: EPA GHGRP facility reports in Maryland.
Facility mix · Scope 1 size bands
How 77 Maryland facilities split by latest reported Scope 1
Exclusive in-state facility counts by latest reported Scope 1 size band, orthogonal to the EPA sector mix above. Source: EPA GHGRP facility reports in Maryland.
Largest corporate emitters in Maryland
Maryland - top corporate emitters (MT CO₂e)
Company footprint
Which companies combine scale and emissions?
Each point is a leading Maryland reporter. The crosshairs mark the median among the companies shown, so the chart distinguishes a larger facility footprint from a higher emissions total.
This is a comparison of the leading 12 reporters displayed above, not a measure of production, population, or total company-wide emissions outside Maryland.
Read the chart values
- HEIDELBERG MATERIALS US CEMENT 6 sites · 1.9M MT
- ARCLIGHT ENERGY PARTNERS FUND VII 14 sites · 1.7M MT
- OLD DOMINION ELECTRIC COOPERATIVE 3 sites · 1.7M MT
- OSAKA GAS ENERGY AMERICA 4 sites · 1.6M MT
- TALEN ENERGY 11 sites · 1.3M MT
- DOMINION ENERGY 27 sites · 1.2M MT
- AES 8 sites · 781K MT
- GENON ENERGY 3 sites · 670K MT
- HOLCIM PARTICIPATIONS (US) 12 sites · 452K MT
- US GOVERNMENT 83 sites · 408K MT
- KMC THERMO 1 sites · 299K MT
- WHEELABRATOR TECHNOLOGIES HOLDINGS 12 sites · 282K MT
State insight: Maryland
Maryland (MD) reports 17.5M MT CO₂e from 77 EPA GHGRP facilities operated by 42 companies (#37 of 54 states by aggregated facility CO₂e). Per-facility average is about 227K MT. Power Plants leads the in-state CO₂e mix at 50.1%.
Top in-state reporters: HEIDELBERG MATERIALS US CEMENT, ARCLIGHT ENERGY PARTNERS FUND VII, OLD DOMINION ELECTRIC COOPERATIVE (together 29.6% of the MD total). These are Scope 1 facility reports only - not a full state inventory or company-wide footprint. See methodology.
Top companies in Maryland
Top facilities in Maryland
Nationwide peers for a lower-footprint state
Comparison paths for a smaller GHGRP state total: nearest CO₂e rollups and facility-count neighbors outside MD.
Similar reported CO₂e
Nearest states by aggregated facility CO₂e (17.5M MT here).
Similar facility inventory
Nearest states by GHGRP reporting facility count (77 here).
State totals aggregate EPA Greenhouse Gas Reporting Program (GHGRP) facility reports sited in Maryland (MD). Figures reflect facility self-reporting, not a full state inventory. See our methodology. Retrieved and formatted by PlainCarbon
Related reading: Understanding corporate carbon reporting · All states · Methodology
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Greenhouse Gas Reporting Program (GHGRP). Consult a qualified professional before making decisions based on this data.