Quick answer
Scope 1 covers direct greenhouse gas emissions from sources owned or controlled by the reporting organization. Scope 2 covers emissions from purchased or acquired electricity, steam, heat and cooling. Scope 3 covers other indirect value-chain emissions. Solar claims depend on the reporting boundary, energy use and ownership of environmental attributes; avoided emissions are reported separately.
Define the reporting organization first
The GHG Protocol Corporate Standard provides the framework for a corporate greenhouse gas inventory. A source is classified relative to the reporting organization and its consolidation approach. The same supply-chain activity can therefore appear in different scopes for different companies.
| Scope | Meaning | Solar-sector example |
|---|---|---|
| Scope 1 | Direct emissions from owned or controlled sources | Fuel burned in an installer’s controlled vehicle fleet |
| Scope 2 | Emissions from purchased or acquired electricity, steam, heat and cooling | Electricity bought for a module factory |
| Scope 3 | Other indirect value-chain emissions | Relevant purchased materials, transport or capital equipment, assessed in the applicable category |
A panel manufacturer’s emissions are not all Scope 3: its own combustion and purchased electricity can belong in Scopes 1 and 2. An installer and a customer need their own boundaries rather than copying the manufacturer’s classification.
What rooftop solar changes
On-site solar can reduce grid electricity purchased and consumed at a facility. Total generation, self-consumption and exports are different quantities. Exported production does not automatically reduce the generating company’s purchased-electricity inventory by the same amount.
Ownership arrangements and energy-attribute transactions also matter. Review whether the system is owned or supplied under a third-party contract and who retains or transfers the associated attributes. A generation estimate alone is insufficient for a verified corporate emissions claim.
The Scope 2 Guidance explains the purchased-energy accounting framework. Its current publisher page records the 2025–2026 consultation on the 2015 guidance; draft proposals should not be presented as already adopted reporting requirements. Check the applicable guidance and programme for the reporting year.
Location-based and market-based results
Location-based accounting uses the relevant grid-average factors. Market-based accounting uses eligible contractual information under the applicable criteria and factor hierarchy. The methods address different accounting questions.
In the published Scope 2 Guidance, chapter 6 and Table 6.1 address generation, distribution and certificate sales. Selling or transferring attributes affects the claims attached to consumed electricity; owning panels does not by itself preserve a zero-emission claim. The guidance sets conditions for dual reporting, rather than requiring two invented figures in every solar sales proposal.
For a project, ask the customer’s reporting specialist to confirm the method, organizational boundary, contracts and attribute records. Keep certificates and electricity measurements linked to the same reporting period and avoid allocating the same claim to multiple parties.
Keep avoided emissions separate from the inventory
A comparison of a solar project with a counterfactual electricity supply asks an impact question. A corporate inventory allocates emissions within a defined organizational and operational boundary. They should not be presented as interchangeable results.
GHG Protocol’s inventory versus project accounting explanation describes this distinction. Its Scope 3 technical assistance response states that avoided emissions from sold products are reported separately, rather than deducted from the Scope 3 inventory.
Solar panels therefore do not acquire “negative downstream Scope 3” simply because their use may displace another generation source. Manufacturing, transport and end-of-life impacts need the appropriate assessment. A modeled avoided-emissions figure is also not automatically a verified offset credit or a retirement certificate.
Example: generation is not the same as displaced imports
Hypothetical location-based illustration: a facility consumes 100,000 kWh in a year. Before solar, all of it is imported. Solar produces 100,000 kWh, of which 65,000 kWh is consumed on site and 35,000 kWh is exported. With no storage and unchanged facility consumption, remaining imports are 35,000 kWh.
Using a purely illustrative factor of 0.40 kg CO₂e/kWh:
| Quantity | Calculation | Result |
|---|---|---|
| Before-solar purchased-electricity estimate | 100,000 × 0.40 / 1,000 | 40 tonnes CO₂e |
| After-solar purchased-electricity estimate | 35,000 × 0.40 / 1,000 | 14 tonnes CO₂e |
| Difference under these assumptions | 40 − 14 | 26 tonnes CO₂e |
These are invented values, not a country factor, customer case or reporting approval. The simple comparison assumes the selected accounting treatment is appropriate and does not resolve attribute sales or other contractual conditions. Multiplying all generation by the factor would give 40 tonnes and confuse generation with the modeled reduction in imports.
A lifetime estimate additionally needs year-specific energy, import displacement and factor assumptions. Do not apply degradation twice if annual modeled production already includes it, or assume future grid factors without stating the scenario.
Evidence for a defensible solar proposal
Retain measured or modeled energy separately, including generation, imports, exports and self-consumption. Identify the factor source, geographic boundary, year, units and gases covered; a CO₂-only factor should not silently become a CO₂e factor. Record system ownership, contracts and attribute rights.
A generation and financial workflow can support discussions about project energy assumptions. Confirm the available outputs, then have the reporting specialist review the accounting claim. Design software is not a substitute for emissions assurance or current disclosure-law advice.
Use the solar carbon footprint definition for lifecycle context and the offset calculation resource when distinguishing project estimates from credit claims. Keep those concepts separate from the corporate scopes.
Questions about scopes and solar
Does solar eliminate a company’s Scope 2 emissions?
Not automatically. The answer depends on remaining energy purchases, accounting method, ownership arrangements and energy attributes. Annual solar generation equal to annual consumption does not establish that all imports or reporting obligations disappear.
Are manufacturing emissions always Scope 3?
No. They depend on the reporting company and boundary. A manufacturer’s controlled combustion and purchased electricity can be Scopes 1 and 2, while relevant purchased inputs are assessed in Scope 3.
Is Scope 3 reporting mandatory?
The applicable jurisdiction, entity, reporting period and programme determine the obligation. Obtain current advice for that entity; do not infer a universal requirement from an accounting definition or an older proposal for legislation.
Can avoided emissions be deducted from Scope 3?
The GHG Protocol guidance distinguishes avoided emissions from the inventory. Report such estimates separately with their baseline and methodology rather than treating them as a negative Scope 3 entry.
Related Glossary Terms
About the Contributors
CEO & Co-Founder · SurgePV
Keyur Rakholiya is identified by SurgePV as its CEO and a company co-founder. His SurgePV author page lists only role information that can be tied to the public profile below; credentials, project totals, testing claims, media appearances, and speaking engagements are not asserted without retained evidence.
Editorial contributor · SurgePV
Rainer Neumann is credited as an editorial contributor on SurgePV content. This profile does not assert engineering credentials, project totals, software-testing experience, education, speaking engagements, or media citations because independent verification evidence is not retained in the publication record.
