A Utility Letter Is Not Power: What Actually Makes a Megawatt Real
Utility letters can be extremely valuable evidence in data center development. So can load studies, service plans and executed agreements. But the title on a document does not determine how real the megawatts are. What matters is what the utility has actually studied, committed to, conditioned, scheduled and ultimately constructed.
A hyperscale power pathway progresses through request, study, engineering, agreement, infrastructure and energization. Each stage can materially advance the project, but each answers a different question.
A studied megawatt is more credible than an unstudied request. It is still not an energized megawatt.
Development sequence
From a load request to an operating megawatt
Stage 01
Load Request
The customer defines the capacity it wants the utility to evaluate. The request enters a process, but does not prove that the grid can serve it.
Stage 02
Study
The utility models the request, identifies reliability issues, required upgrades and potential service timing.
Stage 03
Service Plan
Local substations, connection points, upgrades and customer-specific work become more concrete.
Stage 04
Agreement
Utility and customer establish capacity, cost responsibility, financial security and an estimated service date.
Stage 05
Construction
Transmission, substations and local facilities move from planning into tangible execution.
Stage 06
Energized
The completed system is commissioned and electricity can physically begin serving the customer.
AEP Ohio shows why the stage matters
In 2025, AEP Ohio formally studied 36 proposed data center sites totaling approximately 13,022.7 MW. The study added substantial evidence—and concluded that regional transmission upgrades were necessary for every project.
36
Sites studied
13.0 GW
Requested load
36/36
Required regional upgrades
2031–33
Estimated service windows
Interactive analysis
What does the document actually prove?
Customer intent
Load Request
The customer defines the capacity it wants the utility to evaluate. The request enters a process, but does not prove that the grid can serve it.
A megawatt becomes real when dependencies converge
Regional grid
Transmission capacity and upgrades
Local utility
Substations, feeders and service
Equipment
Transformers, switchgear and protection
Customer
Site ready to receive service
Commissioning
Completed systems safely tested
Documented pathway versus operating power
Power pathway
Documentation can establish
Capacity studied, infrastructure identified, timing estimated and obligations contracted. Electricity may not yet be flowing.
Operating power
Energization requires
Regional and local systems ready, equipment installed, commissioning complete and customer service physically energized.
Bottom line
Utility documentation matters enormously, but no stage should be described more strongly than its underlying facts allow. A utility letter can make a megawatt more credible. Only execution makes the megawatt real.
Verified sources
- 01AEP Ohio — DCT Load Study Letter — November 7, 2025
- 02AEP Ohio — Data Center Tariff Process
- 03AEP Ohio — February 2026 Data Center Load Update
- 04Southwest Power Pool — High Impact Large Load Process
- 05AEP Ohio — Schedule DCT — March 2026 Tariff Book
All factual utility and grid references used in this article were publicly available on or before August 26, 2026.
Jake Becker
Expert insights from the Nistar team on energy infrastructure and hyperscale development.