- The GHG Protocol, used by 97% of S&P 500 companies, is considering shifting from annual, certificate‑based renewable matching to hourly, location‑based reporting.
- Google and Microsoft support hourly matching, arguing it reveals true reliance on fossil fuel power and spurs investment in storage and grid upgrades.
- Meta, Amazon and Salesforce favour an “impact accounting” approach that focuses on emissions reductions rather than hour‑by‑hour matching.
The Greenhouse Gas (GHG) Protocol, whose Scope 2 rules guide most global companies’ reporting of purchased electricity emissions, is considering a fundamental overhaul according to reports.
The debate pits tech giants against one another and highlights the tension between transparency, practicality and cost as the energy transition gathers pace.
At issue is whether companies should match renewable energy purchases to their hourly consumption in the regions where they operate. Under the current GHG Protocol rules, companies can offset their annual electricity consumption with certificates from renewable projects anywhere on the same grid – masking the reality that they often draw power from fossil fuels when the sun is not shining or wind is not blowing.
In April, the GHG Protocol’s governing bodies proposed moving to location‑based, hourly matching. This would require companies to prove that at each hour of the day they are consuming renewable power generated within the same grid region.
Transparency
Google and Microsoft have publicly backed the change. Both have launched “24/7 carbon‑free” initiatives, procuring renewable energy that matches their consumption every hour. They argue that hourly matching provides a clearer picture of reliance on fossil fuels, improves transparency for investors and regulators, and drives investment in battery storage and grid upgrades.
Google says such an approach will create demand for reliable, dispatchable clean power, while Microsoft believes it will catalyse new business models for long‑duration storage.
Not all tech giants agree. Meta, Amazon and Salesforce favour an alternative known as impact accounting, which measures the emissions reduction achieved by renewable purchases but does not require time‑matching. They argue that hourly matching could stifle corporate renewable procurement by making it more complex and costly, particularly in regions with immature markets.
A survey conducted by market researchers found that 80% of companies doubt they could procure time‑matched clean electricity year‑round, suggesting that many businesses are unprepared for such a shift.
Investors and environmental groups largely support the GHG Protocol’s proposed overhaul, contending that the current rules allow companies to claim “100% renewable” while still consuming fossil‑derived electricity during the day.
Without hourly matching, they argue, businesses lack incentive to fund storage or sign contracts for dispatchable clean power. However, some analysts warn that strict rules could deter participation in renewable markets and slow growth just as supply needs to ramp up to meet decarbonisation goals.
Net-zero pledges
The Scope 2 accounting debate illustrates a broader question: should the energy transition prioritise immediacy and simplicity or completeness and integrity? Hourly matching promises greater accuracy and could accelerate investment in storage and flexibility, but risks alienating smaller companies and emerging markets.
For UK corporates, the outcome could shape procurement strategies: many rely on renewable certificates to meet net‑zero pledges and may face higher costs if hourly matching becomes the standard.
Policy clarity and market development – particularly around grid transparency, storage incentives and regional renewable auctions – will be essential to ensure that tougher accounting rules drive real decarbonisation rather than compliance burden.
