Hawley and Warren Want to See Your Power Bills. Cooling Operators Should Get Their Numbers Ready.
The federal government has no idea how much electricity American data centers consume. Not really. The U.S. Energy Information Administration collects utility-level generation and transmission data, but the actual breakdown by end-use sector, the kind that would tell you what percentage of national grid load is going to cooling towers and server racks, comes from surveys, models, and estimates with wide confidence intervals.
That is about to become a policy problem.
On March 26, Senators Josh Hawley (R-MO) and Elizabeth Warren (D-MA) sent a joint letter to the EIA requesting a mandatory annual reporting requirement for data centers and other large electricity loads, as reported by Tim De Chant at TechCrunch. Hawley and Warren agree on almost nothing. When they send a joint letter, pay attention.
The ask is simple on its surface: require large electricity consumers to report their consumption to the federal government each year. The downstream consequences for cooling operators are anything but simple.
The Consumption Numbers That Drove This Letter
The current estimate is that US data centers consume roughly 176 TWh annually, representing about 4.4% of the national electricity total. That is the best available figure. The Electric Power Research Institute projects that data centers could account for 9 to 17% of US electricity consumption by 2030. The range between 9% and 17% is not a rounding error. It represents a difference of hundreds of terawatt-hours annually, enough to power entire states.
That uncertainty is the point. Senators Hawley and Warren are not asking the EIA to study data centers. They are asking why the federal government does not already know what the second-fastest-growing electricity demand sector in the country is actually consuming.
The answer is that data centers have historically avoided the reporting requirements applied to other large industrial electricity consumers, partly because they grew fast enough to outpace regulatory attention and partly because hyperscalers have negotiated favorable treatment from utilities who need the load. Retail electricity prices have climbed 42% since 2019. Those prices affect every residential and commercial customer on the same grid. The political patience for information asymmetry is running out.
Why This Is a Cooling Story
Mandatory energy reporting to the EIA does not stop at total kilowatt-hour consumption. The natural next step, the one that any regulator, utility commissioner, or grid planner would request once the top-line numbers arrive, is a breakdown by end use. How much of that electricity runs servers. How much runs cooling. What the facility's power usage effectiveness ratio looks like. What water it consumes per kilowatt-hour of IT load.
PUE. WUE. Cooling energy as a percentage of total load. Water consumption per MWh of compute. These are the metrics that cooling engineers already track internally. They will become the metrics that regulators track externally once annual reporting creates a federal dataset.
The transition from voluntary disclosure to mandatory reporting changes the calculus completely. Right now, an operator with a PUE of 1.8 running legacy air cooling in a hot climate can simply not publish that number. Under a mandatory reporting framework, that number goes to the EIA. It sits in a database alongside every other facility's figures. Pattern recognition becomes trivial. Outliers become visible. Regulatory pressure concentrates on the worst performers first, but the definition of "acceptable" gets ratcheted down as the dataset grows.
Pennsylvania moved first at the state level. The state legislature passed H.B. 1834, which includes data center energy reporting requirements as part of broader grid transparency legislation. Pennsylvania is not a fringe regulator. It is a major data center market with significant colocation density in the Philadelphia suburbs and Pittsburgh corridors. When a state with that much installed capacity adopts mandatory reporting, the industry takes note.
The Hawley-Warren letter asks the federal government to move in the same direction, but at national scale. If the EIA establishes mandatory reporting standards, they supersede the patchwork of state requirements. Every operator in every market reports to the same framework, on the same schedule, in the same format.
The Pipeline Behind This Letter
The Hawley-Warren letter did not arrive in a vacuum. Separately, Senators Bernie Sanders and Alexandria Ocasio-Cortez have introduced a moratorium bill targeting new data center construction, framed around grid impact and environmental concerns. The moratorium bill is unlikely to pass in its current form, but it establishes a ceiling: the most aggressive regulatory outcome being floated in Congress. The Hawley-Warren reporting requirement is the floor.
Between those poles, reporting is the instrument most likely to survive legislative negotiation. Data collection before regulation is a pattern that repeats in every sector the federal government eventually decides to manage. Emissions reporting preceded emissions limits. Financial disclosure preceded capital requirements. The EIA collecting annual data center consumption figures is not the end of the story. It is the precondition for the chapters that follow.
NTT Global Data Centers announced plans to double its global capacity to 4 GW in mid-March. There are currently 550 planned data center projects globally representing 125 GW of total capacity. If even a fraction of that pipeline comes online, the share-of-grid-load numbers in the EPRI projection start looking conservative. The political pressure behind the Hawley-Warren letter is only going to intensify.
What Operators Should Do Before the Government Asks
The EIA has not yet responded to the Hawley-Warren letter. Congress has not passed a law. No compliance deadline exists. That window will close, and operators who treat it as a grace period rather than preparation time are making a mistake.
The immediate action is internal audit. Every facility should know its PUE, its WUE, and its cooling energy as a percentage of total load, broken down by month and season. Most large operators track these already. Many colocation providers and smaller operators do not, or they track them inconsistently across sites with different metering setups.
Consistency matters here. If mandatory reporting arrives with a standardized methodology, operators who have been calculating PUE one way will have to reconcile their historical data against the federal definition. The Green Grid's PUE specification, which is the closest thing the industry has to a universal standard, has multiple annualization methods. The EIA will likely prescribe one. Operators who have been using a different method will face a recalibration period that reveals variances they would rather have discovered privately.
Water use effectiveness is the more complicated number. WUE calculations depend on facility boundaries and what counts as "consumed" water versus water that cycles through a closed system. A facility using a closed-loop liquid cooling architecture with supplemental evaporative cooling during peak summer days has to decide how to account for that supplemental usage. Get that methodology established now, before a federal form requires a single answer.
The operators who will navigate mandatory reporting most cleanly are the ones who already have granular, consistent, auditable records at the facility level. Not portfolio-level averages. Not estimates based on nameplate capacity and utilization assumptions. Actual metered data, facility by facility, timestamped and cross-referenced against IT load and cooling system state.
That is the standard the EIA will eventually want. Building toward it now is cheaper and less disruptive than retrofitting data infrastructure to meet a compliance deadline under pressure.
The Position This Industry Should Take
There is a version of this where the data center industry fights mandatory reporting on principle, delays the rulemaking, and eventually loses to a more aggressive regulatory framework than a simple annual disclosure would have been. That outcome is predictable and avoidable.
The better position is to engage with the EIA's rulemaking process directly, propose a reporting methodology that is technically rigorous and operationally feasible, and demonstrate that the industry is capable of self-governance on metrics that matter to grid planners and policymakers. That requires knowing your numbers. It also requires being honest about what the numbers show, even when the cooling infrastructure in a given facility is underperforming against what current technology makes possible.
The data is coming out. Hawley and Warren are not the last senators who will ask for it. The only real choice operators have is whether the framework that defines what gets reported is one they helped design.