PERI: Greenhouse 100 Polluters Index

PERI Greenhouse 100 Polluters State Press Release For Alabama

November 6, 2025

With Future Data in Doubt, UMass Amherst Political Economy Research Institute Names Top U.S. Climate Polluters

Rollback in EPA reporting requirements may end Greenhouse 100 Polluters Index and access to vital public information

AMHERST, Mass. — Researchers at the University of Massachusetts Amherst’s Political Economy Research Institute (PERI) today published a new Greenhouse 100 Polluters Index, reporting 2023 greenhouse gas emissions using the latest—and possibly last—data available from the U.S. Environmental Protection Agency’s Greenhouse Gas Reporting Program.

On Sept. 12, the EPA announced plans to end most of the program and suspend all remaining reporting requirements until 2034. The decision could leave the public without reliable, standardized data on corporate climate pollution for nearly a decade.

“The Greenhouse 100 Index informs consumers, shareholders, regulators, lawmakers and communities about corporate releases of climate-altering pollutants into our environment,” says Professor Michael Ash, co-director of PERI's Corporate Toxics Information Project. “The EPA’s decision to effectively end the Greenhouse Gas Reporting Program removes access to vital public information and leaves public and private decision-makers flying in the dark or relying on a patchwork of voluntary and potentially cherrypicked or greenwashed reports.”

Launched in 2018, PERI’s free, open-access online tool provides data on every company that reports to the EPA. The resource includes state-by-state rankings and detailed reports identifying all companies and facilities responsible for each state’s greenhouse gas emissions. Archives of earlier editions remain available to the public.

The following is PERI's analysis for Alabama.

Overall

Summary for Alabama	Value
Total 2023 CO2 equivalent emissions (millions of metric tons):	72.2
Percentage of national total:	2.8
Rank among US states (1=top):	8

Top 5 Polluter Companies in Alabama

Company	CO2 equivalent emissions (mmt)	% of state total	Num. facilities
Southern Company	36.1	55.7	16
POWERSOUTH ENERGY COOPERATIVE	2.6	3.9	4
Energy Capital Partners	2.2	3.4	1
Constellation Energy Corporation	1.6	2.5	1
Lhoist Group	1.6	2.4	2

Top 5 Sectors in Alabama

Sector Name	CO2 equivalent emissions (mmt)	Num. facilities
Power Plants	45.4	21
Cement Production	3.6	5
Lime Manufacturing	3.1	5
Pulp and Paper	2.9	11
Underground Coal Mines	2.7	4

Top 10 facilities in Alabama

Facility Name	CO2 (metric tons)	Company
James H Miller Jr	16,558,381	Southern Company
Plant H. Allen Franklin	5,078,422	Southern Company
Barry	5,007,385	Southern Company
E C Gaston	2,996,030	Southern Company
E B Harris Generating Plant	2,420,045	Southern Company
Morgan Energy Center	2,220,488	Energy Capital Partners
Central Alabama Generating Station	1,918,313	Southern Company
Hillabee Energy Center	1,621,452	Constellation Energy Corporation
McWilliams	1,478,561	POWERSOUTH ENERGY COOPERATIVE
Tenaska Lindsay Hill	1,069,085	Tenaska

“In making this information available, we are building on the historic achievements of the right-to-know movement,” Ash adds. “Our goal is to engender public participation in environmental decision-making, and to help residents translate the right to know into the right to clean air, clean water and a livable planet.”

The EPA’s rollback of reporting and disclosure requirements also threatens other PERI indexes that track companies’ release of pollution into the air and water, and near schools.

Contacts:
Michael Ash, mash@umass.edu

Aaron Kupec, akupec@umass.edu