There was a time when the total power consumption by all data centers combined would have barely been a rounding error in national statistics. Today, they’re one of the heaviest off-takers on the grid, and regulators are on red alert. Policymakers are hotly debating how fast the sector will grow and worrying about the impact it will have on the renewables transition.

Data center operators naturally want to demonstrate their green credentials, yet the infrastructure the AI revolution runs on is consuming generation capacity at a pace that makes net-zero targets harder to reach.

US data center electricity consumption has tripled since 2014, while European data-center electricity demand is expected to grow 150 percent in the next decade, leaping from 96TWh in 2024 to 236TWh in 2035. That shift is happening just as the GHG (Greenhouse Gas) Protocol prepares the biggest overhaul of corporate electricity accounting since its inception.

The Scope 2 update now in public consultation recognizes the changing landscape, and, as a result, data centers won’t be able to rely on annual renewable-energy purchases to support carbon-reduction claims. If a company reports that 80 percent of its energy consumption is from renewable sources, it might soon need to document the precise hours when those electrons were drawn from the grid.

For an industry built on guaranteed uptime and double redundancy, this adds an unwelcome new variable: how to address the inherent unpredictability of green generation on an hourly basis.

Matching sets

Under current rules, data centers can purchase renewable energy certificates (RECs) or sign power-purchase agreements (PPAs) with renewable generation projects for a set amount of electricity. The clean-energy attributes embedded in those contracts can then be credited against their total annual electricity use.

This arrangement has the benefit of simplicity, but it's also problematic because timing doesn’t factor in. A cloud services hyperscaler might consume a quantity of fossil fuel-generated power at 3am, but an offsetting quantity of solar power still counts as 100 percent renewable – even if it was generated at noon.

This system helped kick-start the boom in corporate clean-energy procurement. Data-center operators were incentivized to buy up RECs and sign PPAs, which helped finance wind and solar buildouts. But the grids didn’t stand still. As the transition to renewables continues, the mismatch between intermittent production and continuous consumption has become too big to paper over.

Emissions vary by hour and location because the grid mix changes by hour and location. Annualized certificate matching obscures that reality.

Hourly matching can soon be the norm

The GHG Protocol’s proposed update would ensure that Scope 2 reporting reflects when and where actual power consumption occurs. That means a shift toward hourly matching of RECs, also referred to as 24/7 carbon-free electricity.

A data center's renewable energy supply will have to sync neatly to its renewable energy consumption, hour by hour, market by market. That raises the bar for procurement and compliance.

In practice, it will be harder to say ‘we run on clean energy’ if the local grid is coal-heavy after dark and the solar project your PPA depends on is three states away.

Change is coming fast. The EU’s Energy Efficiency Directive already requires hyperscalers to report energy consumption and emissions intensity on an hourly basis. The good news is that hourly matching is more than achievable with the right processes and platforms.

A 2023 study by Eurelectric/Pexapark found that moving from a single-technology PPA to one blending solar and wind generation projects can achieve up to 75 percent hourly matching, depending on the grid.

How data centers should prepare

Start with data cleanup

GHG Protocol Scope 2 is an accounting standard, not a target. So there’s no expectation that 100 percent 24/7 matching has to be achieved from day one – the first step is to understand the current consumption profile for each facility. Collecting demand and supply data, or using technology-specific ‘proxy’ profiles where granular generation details are not available, will help operators understand their baseline hourly CFE score.

Adopt a portfolio mindset

The hourly REC matching score can typically be improved by diversifying the mix of technologies. The final stretch to 100 percent may require demand shifting, storage, and/or flexible supply. That means re-thinking how portfolios are composed. Data centers may need solar for daytime, wind for evenings, and battery storage to cover any gaps.

Find the hours that really count

The shift to hourly matching changes the business value of RECs. Those covering hours with scarce supply, for example, are likely to become the most sought-after. Analyzing consumption patterns ahead of the new rules could give data centers a strategic step up.

Expect more measurable business benefits

As electricity markets settle hourly, granular matching data is a good signal for PPA hedge effectiveness. Better alignment between supply and load can strengthen the hedge and reduce exposure to price swings, but operators need reliable facility-level data first to measure and act on it.

A new playbook is emerging

Leading operators are already running hourly accounting pilots by facility, mapping hourly consumption patterns against existing portfolios. This creates clean matching curves, so hourly electricity demand is compared to hourly clean-energy coverage to see how well the two align. Others are working with utilities on hybrid PPA products and tariffs that use hourly data to confirm renewable energy generation.

Energy markets are embracing the idea of aligned renewable procurement, and the GHGP Scope 2 updates are just the latest evidence of market realignment. Data centers need to prepare, work out how to strengthen their negotiating position, and find opportunities in the shift.