ESG and Scope 1/2/3 Emissions: How Carbon Accounting Affects Energy M&A

Introduction

ESG (environmental, social, and governance) considerations have fundamentally altered how energy M&A transactions are evaluated, structured, and marketed. Five years ago, ESG was a peripheral topic in energy deal diligence; today, carbon emissions analysis, climate risk assessment, and emissions reporting obligations are standard work streams in virtually every energy transaction. The reason is straightforward: investors, regulators, and corporate buyers are increasingly making capital allocation decisions based on emissions profiles, and an asset's carbon footprint directly affects its pool of potential buyers, its financing terms, and its long-term valuation.

For energy investment bankers, ESG creates deal flow in both directions. Companies with net-zero commitments are divesting high-emission assets (coal plants, high-emission refineries, carbon-intensive upstream positions), creating sell-side mandates. Companies seeking to improve their emissions profile are acquiring renewable energy platforms, carbon capture technology, and low-carbon generation assets, creating buy-side mandates. Understanding how emissions are measured, reported, and priced into transactions is essential for structuring credible deal rationale and marketing materials.

The Greenhouse Gas Protocol, the global standard for corporate emissions accounting, divides a company's carbon footprint into three scopes:

Scope 1: Direct Emissions are greenhouse gases emitted directly from company-owned and controlled sources. For energy companies, Scope 1 includes combustion emissions from operated generation assets (power plants), flaring and venting at upstream production sites, process emissions from refining and petrochemical operations, and fugitive methane emissions from natural gas infrastructure. Scope 1 is the most measurable and most directly controllable category. An E&P company's Scope 1 is driven by its production volumes, flaring rates, and methane management practices.

Scope 2: Indirect Energy Emissions are emissions from the generation of purchased electricity, steam, heat, or cooling consumed by the company. For energy companies, Scope 2 is typically a smaller category (since many energy companies generate their own power), but it matters for midstream operators that purchase electricity to run compressor stations and for companies with significant office and facility electricity consumption.

Scope 3: Value Chain Emissions are all other indirect emissions in the company's upstream and downstream value chain. For energy companies, Scope 3 is the largest and most controversial category because it includes the combustion of sold products by end users. An E&P company's Scope 3 includes all the CO2 released when the oil and gas it produces is ultimately burned by consumers. This means that Scope 3 emissions for a major oil producer can be 5-10x larger than its combined Scope 1 and Scope 2 emissions, making it the dominant category by far.

Scope 3 Emissions

All indirect greenhouse gas emissions occurring in the value chain of a reporting company, both upstream (supply chain, purchased goods and services, capital goods, business travel) and downstream (processing of sold products, use of sold products, end-of-life treatment). For oil and gas companies, the most significant Scope 3 category is "use of sold products" (Category 11), which captures the emissions from end-user combustion of petroleum products and natural gas. Scope 3 is the most difficult to measure accurately, the most controversial in terms of accountability (should the producer or the consumer bear responsibility?), and the most impactful on M&A dynamics because buyers with net-zero commitments must consider whether acquiring hydrocarbon assets adds Scope 3 emissions to their consolidated footprint.

Buyer Screening and Pool Narrowing

The most direct impact of ESG on energy M&A is the narrowing of buyer pools for carbon-intensive assets. European oil majors (Shell, BP, TotalEnergies, Equinor) with public net-zero commitments face scrutiny from investors and proxy advisory firms when acquiring assets that increase their emissions. Some infrastructure funds and pension funds have explicit exclusion policies that prohibit investment in coal, thermal generation above certain emission thresholds, or upstream assets without credible transition plans.

This buyer pool narrowing affects valuation directly. When fewer buyers can participate in an auction for a high-emission asset, competitive tension decreases, and the seller may accept a lower price. Conversely, low-emission assets (renewable energy portfolios, natural gas assets with low methane intensity, pipeline infrastructure with electrified compression) attract a broader buyer pool that includes ESG-constrained capital, supporting premium valuations.

Due Diligence and Carbon Liability

ESG due diligence in energy M&A now routinely includes a detailed carbon assessment covering the target's Scope 1, 2, and 3 emissions profile, methodology, and data quality. Key areas evaluated include: historical emissions trends and intensity metrics (emissions per unit of production or revenue), emissions reduction targets and progress tracking, Science Based Targets initiative (SBTi) alignment, carbon offset strategies and verification quality, methane monitoring and leak detection programs, and exposure to current or forthcoming carbon pricing mechanisms.

For acquirers with public climate commitments, the carbon assessment directly informs the go/no-go decision and the bid price. An asset that would increase the buyer's consolidated emissions intensity may require the buyer to purchase offsets, invest in abatement technology, or revise its public targets, all of which represent costs that are factored into the bid.

The regulatory framework for emissions disclosure is divergent and evolving, creating complexity for energy companies and their advisors.

The SEC climate disclosure rule, adopted in March 2024, would have required public companies to disclose material Scope 1 and Scope 2 emissions (with Scope 3 reporting required only when deemed material). However, in March 2025, the SEC voted to end its defense of the rules, which had been subject to a judicial stay since April 2024. The practical effect is that mandatory federal climate disclosure in the US is, for now, not being enforced.

The EU's Corporate Sustainability Reporting Directive (CSRD) takes a broader approach, requiring disclosure of all three emission scopes under a "double materiality" framework (both how climate risk affects the company and how the company affects the environment). The CSRD has extraterritorial reach: it applies to non-EU companies with significant EU operations or revenues, meaning many US energy companies with European operations or customers will need to comply. Penalties can reach 3% of global net turnover (reduced from 5% under the March 2026 Omnibus package).

California SB 253 requires US-based companies with $1 billion+ in annual revenue to report Scope 1 and 2 emissions (due August 10, 2026) and Scope 3 emissions starting in 2027. This applies to many energy companies regardless of where they are headquartered, provided they do business in California.

ESG is neither a passing trend nor an unqualified tailwind for deal activity. The reality is nuanced. In the US, the regulatory push for mandatory disclosure has stalled at the federal level (the SEC's retreat), while state-level requirements (California) and international frameworks (CSRD) continue to expand. In Europe, ESG reporting requirements are becoming more stringent and legally enforceable. The net effect for energy M&A is that ESG considerations are permanently embedded in the deal process, but the intensity and specificity of ESG diligence varies by buyer type, geography, and asset class.

The most practical impact for energy bankers is in deal marketing. Sell-side materials for energy assets now routinely include an ESG section covering emissions intensity, climate commitments, environmental compliance, and methane management. Buy-side advisory involves screening potential targets against the client's ESG criteria, assessing carbon liability, and modeling the emissions impact of a proposed acquisition on the buyer's consolidated footprint.