Everything you need to know about SSS reporting, pro-rata allocation, and building defensible Scope 2 claims.
SSS refers to the default electricity delivered to customers who don't purchase from competitive suppliers or opt into voluntary green programs. It includes carbon-free energy from legacy nuclear, large hydro, and RPS-mandated resources that utilities procure on customers' behalf—energy you're already paying for but typically can't claim for Scope 2.
RECs represent voluntary procurement of renewable attributes. SSS reporting captures the carbon-free energy already embedded in your utility supply through regulated cost recovery. Both can coexist: SSS establishes your baseline, and voluntary RECs/PPAs can fill remaining gaps.
Resources must meet three criteria: (1) carbon-free generation (nuclear, hydro, renewables), (2) cost recovery through regulated rates (not sold to third parties), and (3) no prior claim on the attributes. We exclude resources whose RECs are sold externally or retired for voluntary programs.
Your claimable share equals: (SSS Carbon-Free MWh ÷ Utility Retail Sales MWh) × Your Load. For example, if a utility has 6M MWh retail sales and 1.2M MWh of SSS carbon-free energy, a customer with 50,000 MWh load can claim 10,000 MWh (20% × 50,000).
Yes. Our methodology aligns with GHG Protocol Scope 2 Quality Criteria for market-based accounting: the claims describe delivered electricity, are based on accurate generation data, represent exclusive ownership (no double-counting), and operate in the same market and timeframe as consumption.
Public proxy reports use credible public data sources (EIA filings, state compliance records) and are useful for preliminary estimates. Verified reports include supplier-attested data and third-party verification—these are audit-ready for GHG disclosures.
We track three exclusion categories: (1) RECs sold to third parties, (2) RECs retired for voluntary programs like green tariffs, and (3) RECs claimed by other SSS Registry customers. Anti-shuffling controls ensure fair pro-rata allocation with no attribute leakage.
Each verified report includes: your pro-rata SSS allocation (MWh), a Supplier-Specific Emission Factor (SSEF) for your remaining load, source-level documentation of all inputs, and an attestation letter suitable for auditors and disclosure frameworks.
Typical delivery is 1-2 months for verified reports, depending on utility data availability. Public proxy estimates can be generated faster. Compare this to 6+ months for manual utility-by-utility research.
We cover US utilities with documented resource mix data. Coverage is expanding—contact us to check availability for your specific utility or to request prioritization.
Our documentation includes detailed technical FAQs on methodology, data sources, and edge cases.
Book a demo to walk through the methodology, discuss your specific utility situation, or get help scoping an engagement.