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Summary Author: Gazal Gupta

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American Electric Power Co. v. Connecticut 

Date: 20 June 2011 

Court: United States Supreme Court 

Citation(s): Am. Elec. Power Co. v. Connecticut, 564 U.S. 410 (2011) 

Short summary  

Individuals and groups sued electric companies emitting large amounts of carbon dioxide on federal common law grounds. The Supreme court unanimously ruled that, under the Clean Air Act, the Environmental Protection Agency has the exclusive authority to regulate greenhouse gas emissions, displacing any claims against polluters that seek direct judicial regulation.  

Summary by: Gazal Gupta

Link to Original Judgement

Click here to open the case in PDF format

Weight of decision  

This decision is binding on all United States federal and state courts.  

Key facts 

Several non-profit groups and states claimed violations of federal common law against five private energy corporations emitting significant greenhouse gases (GHGs) (650 million annual tonnes as a group). Plaintiffs argued that significant contributions to global warming constituted interstate nuisance and allowed them to seek a court order limiting GHG emissions from Defendant’s plants. Defendants responded that, under the Clean Air Act (CAA), the Environmental Protection Agency (EPA) has exclusive authority to regulate GHGs.  

Previous instances  

Since Erie Railroad Co. v. Tompkins, 304 U.S. 64 (1938), there has been no general federal common law recognized by courts in the United States. 

In Massachusetts v. EPA, carbon dioxide and other GHGs were held to fall within the scope of the CAA for regulation by EPA, and states were granted standing to sue for harms incurred by climate change.  

The Second Circuit Court of Appeals reversed the District Court which first heard this case and ruled that petitioners had standing and stated administrable nuisance claims not pre-empted by the grant of regulatory authority to the EPA under the CAA. 

Summary of holding 

On appeal, the Supreme Court affirmed the Second Circuit on petitioner’s standing but unanimously reversed on the administrability of their claims, holding that § 202(a) of the CAA displaced federal common law by granting the EPA the sole power to regulate GHGs. 

Potential takeaways for future climate migration litigation 

  • Creative legal strategies invoking older traditions from federal common law in the United States are unlikely to succeed, especially when a certain field of regulation or enforcement has been occupied by an agency such as the EPA. Harms incurred by climate change should be litigated primarily on statutory grounds in the United States. 
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Alaska Department of Environmental Conservation v. EPA 

Date: 21 January 2004 

Court: Supreme Court of the United States  

Citation(s): Alaska Dept. of Environmental Conservation v. EPA, 540 U.S. 461 (2004) 

Short summary  

Alaska’s Department of Environmental Conservation determined what pollution-restricting technology should be implemented for a mine expansion, per requirements of the Clean Air Act. The federal Environmental Protection Agency intervened, disagreeing with Alaska’s determination of which technology to utilize. The Supreme Court affirmed the Ninth Circuit Court of Appeals’ ruling that the Environmental Protection Agency properly overruled Alaska’s initial determination.  

Summary by: Gazal Gupta 

Link to Original Judgement

Click here to open the case in PDF format

Weight of decision  

This decision is binding on all United States federal and state courts.  

Key facts 

Under the Clean Air Act (CAA), state agencies must identify the best strategy to prevent air quality from deteriorating in regions that comply with national air quality standards. In part, they must ensure that polluting industries utilise the “best available control technology” to restrict pollution whenever they construct new facilities. Teck Cominco Alaska, a mining firm, applied for a permit to develop a new generator at one of its mines in 1998. The permit was issued by the Alaska Department of Environmental Conservation (ADEC), and it required Cominco to use “Low NOx” technology in all its generators, not just the new one. However, the Environmental Protection Agency (EPA) intervened, claiming that a more advanced technique was available and should be utilized.  

Previous instances  

The EPA’s decision was challenged by ADEC in the Ninth Circuit Court of Appeals, arguing that the EPA lacked the authority to interfere with the state agency’s decision under the CAA. The Ninth Circuit ruled in favour of the EPA. 

Summary of holding 

On appeal, the Supreme Court was asked to settle whether if the EPA, under the CAA, has the authority to overrule a state agency’s decision that a company is using the “best available controlling technology” to prevent pollution. 

§ 165(a)(4) of the CAA stipulates that no large air pollutant-emitting plant can be built unless it is fitted with the best available control technology. Furthermore, when EPA finds that a state is not complying with a CAA requirement governing the construction of a pollutant source, it has the authority to issue an order prohibiting construction, impose an administrative penalty, or file a civil action for injunctive relief under § 113(a)(5) of the CAA. § 167 of the CAA authorizes EPA to take any necessary action, including issuing an order or pursuing injunctive relief, to prevent the construction of a significant pollutant-emitting plant that does not comply with the CAA’s pollutant criteria. 

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