Published June 4, 2026
By NZero
Organizations around the world are setting increasingly ambitious climate goals, and Scope 2 emissions remain a key focus area. Scope 2 emissions represent indirect greenhouse gas emissions associated with purchased electricity, steam, heating, and cooling. For many businesses, electricity consumption is one of the largest sources of reported emissions, making Scope 2 accounting an important part of sustainability reporting and decarbonization strategies.
Today, most organizations use annual renewable energy matching to support market-based Scope 2 reporting. Under this approach, companies can purchase renewable energy certificates (RECs) that correspond to their annual electricity consumption. While this method has helped drive significant renewable energy investment over the past decade, a growing discussion is emerging around whether annual matching fully reflects the emissions impact of electricity use. As a result, hourly matching has become an increasingly important topic among sustainability leaders, energy buyers, utilities, and standard-setting organizations. Although no final changes have been adopted by the Greenhouse Gas Protocol, organizations are beginning to assess how more granular accounting methods could influence future reporting expectations.
Under the current market-based Scope 2 accounting framework, an organization may purchase renewable energy certificates equivalent to its annual electricity consumption. If a company consumes 10,000 megawatt-hours of electricity during the year and purchases 10,000 megawatt-hours worth of eligible renewable energy certificates, it may be able to claim that consumption as renewable under current accounting rules.
Hourly matching introduces a different perspective. Instead of evaluating electricity consumption and renewable generation over an entire year, it examines how closely renewable energy production aligns with electricity consumption during each hour of operation.
A simple example helps illustrate the difference:
| Time | Facility Electricity Use | Renewable Generation |
|---|---|---|
| 12:00 PM | 100 MWh | 120 MWh |
| 8:00 PM | 100 MWh | 0 MWh |
In this scenario, the renewable project generates more electricity than the facility consumes during the middle of the day. However, during the evening, the facility continues to consume electricity while the solar resource is no longer generating power.
Under annual matching, the excess renewable generation produced during daylight hours may offset electricity consumed later in the year, allowing the organization to achieve a 100% renewable electricity claim on an annual basis.
Under hourly matching, the evening electricity consumption would remain unmatched because renewable generation was not available during that specific hour. The focus shifts from total annual renewable generation to the timing of renewable generation relative to electricity consumption.
Supporters of hourly matching argue that electricity emissions vary significantly throughout the day depending on the generation resources operating on the grid. Matching renewable generation to consumption on an hourly basis may provide a more accurate picture of the emissions associated with electricity use. It may also encourage investments in technologies such as energy storage, demand flexibility, and diverse renewable energy resources that can support carbon-free electricity availability during more hours of the day.
The discussion is closely linked to broader efforts around 24/7 carbon-free energy, which seeks to align electricity consumption with carbon-free generation every hour of the year rather than relying solely on annual balancing.
As interest in hourly matching continues to grow, one of the main reasons is the changing nature of electricity systems. Renewable energy deployment has expanded significantly across many regions, increasing the share of solar and wind generation on electric grids. While these resources reduce emissions, their output varies based on weather conditions and time of day. This variability creates periods when renewable generation is abundant and other periods when fossil fuel generation remains necessary to meet demand.
At the same time, organizations are seeking greater transparency regarding the actual emissions impact of their energy procurement strategies. Many companies have already achieved annual renewable electricity matching goals and are now looking for additional ways to demonstrate progress toward decarbonization. More detailed energy data can provide insights into when emissions occur and where opportunities for further reductions exist.
Advances in energy data collection and digital infrastructure are also making hourly accounting more feasible. Utilities are deploying advanced metering infrastructure, organizations are gaining access to interval energy data, and renewable energy tracking systems are becoming more sophisticated. Information that was once difficult to obtain is increasingly available through digital platforms and utility programs.
The Greenhouse Gas Protocol’s Scope 2 guidance remains the dominant framework for corporate electricity emissions reporting. While discussions continue regarding potential future updates, organizations are closely monitoring developments because any shift toward more granular reporting could influence procurement strategies, reporting processes, and data management requirements.
One of the most significant challenges associated with hourly matching is data availability and quality.
Traditional Scope 2 reporting often relies on monthly utility bills, annual energy consumption totals, and renewable energy certificate purchases. Hourly matching requires substantially more detailed information.
Organizations must understand when electricity is being consumed across facilities, buildings, and operations. This often requires access to interval utility data, smart meter readings, submetering systems, or energy management platforms capable of collecting and analyzing large volumes of information.
Renewable energy data presents an additional layer of complexity. Companies with on-site solar systems may have access to generation information, but organizations relying on off-site renewable procurement arrangements may need detailed production data from external sources. Aligning consumption and generation data across different systems can become challenging, particularly for organizations with large real estate portfolios or operations spread across multiple utility territories.
Several common challenges emerge when organizations begin evaluating their readiness for more granular accounting:
These challenges highlight an important reality. Regardless of whether hourly matching becomes a formal reporting requirement, organizations are increasingly benefiting from stronger energy data management capabilities.
Although hourly matching remains an evolving concept, there are several practical steps organizations can take today to strengthen their preparedness.
The first step is improving visibility into electricity consumption. Understanding when energy is used can help organizations identify operational inefficiencies, demand management opportunities, and periods of high emissions intensity. Access to interval data provides a foundation for both energy management and future reporting needs.
The second step is evaluating existing Scope 2 reporting processes. Sustainability teams should understand how energy data is collected, how renewable energy purchases are tracked, and where potential data gaps exist. A comprehensive review can help organizations identify areas that may require improvement as reporting expectations evolve.
The third step is assessing renewable energy procurement strategies. Organizations may benefit from understanding not only how much renewable energy they procure but also when renewable generation occurs relative to electricity consumption. This can provide valuable insights into potential opportunities for storage, demand flexibility, or diversified renewable procurement.
The fourth step is building a centralized energy data infrastructure. Organizations that consolidate utility data, renewable energy information, emissions factors, and reporting workflows are often better positioned to adapt to changing requirements. A centralized approach can improve data accuracy, reduce reporting complexity, and support more informed decision-making.
From an operational perspective, energy visibility can create value beyond sustainability reporting. Better data supports cost management, energy efficiency initiatives, demand response participation, and long-term energy planning.
The growing discussion around hourly matching reflects a broader evolution in how organizations think about electricity-related emissions. While annual renewable energy matching remains the foundation of most Scope 2 reporting today, stakeholders are increasingly exploring ways to improve the transparency and accuracy of electricity emissions accounting.
Whether future reporting frameworks ultimately incorporate hourly matching requirements remains uncertain. However, the direction of travel is clear. Energy data is becoming more granular, expectations for transparency are increasing, and organizations are seeking a deeper understanding of the relationship between electricity consumption and renewable energy generation.
For businesses, the most effective response is to strengthen the underlying data foundation. Organizations that can accurately track when and where energy is consumed will be better equipped to navigate future reporting developments, evaluate renewable energy strategies, and identify opportunities to reduce emissions. As the conversation around Scope 2 accounting continues to evolve, access to reliable, auditable, and detailed energy data will remain a critical capability for sustainability and energy management teams.
