When planning a development project, one of the most important questions is whether the local electrical infrastructure can support the proposed demand. Developers frequently encounter terms like power feasibility study and load letter during due diligence and utility coordination, but the difference between the two is not always clear.
Both play a role in confirming electrical capacity for a project, yet they serve very different purposes. Understanding how each document fits into the development process can help avoid delays, unexpected infrastructure upgrades, and costly redesigns later in the project lifecycle.
Why Electrical Capacity Matters in Development
Electrical capacity is a critical factor in determining whether a site is viable for development. This is especially true for projects with significant power demands such as data centers, large commercial buildings, multifamily developments, and industrial facilities.
What Happens When Electrical Capacity Is Insufficient
If the available infrastructure cannot support the required electrical load, developers may face major obstacles such as:
- Utility upgrades that take months or even years to complete
- Expensive off-site infrastructure improvements
- Project redesigns to reduce power demand
- Delays in permitting and construction schedules
Confirming electrical capacity early in the due diligence process allows developers to identify these challenges before they impact the project timeline or budget.
What Is a Power Feasibility Study?
A power feasibility study is an early-stage technical analysis used to determine whether the existing electrical infrastructure near a development site can support the project’s projected demand.
The study evaluates nearby substations, distribution lines, and available capacity within the local electrical network. It also considers how power could be routed to the project site and whether upgrades or extensions to the system may be required.
What a Power Feasibility Study Typically Includes
A typical power feasibility study may include:
- Evaluation of nearby utility infrastructure
- Estimated electrical demand for the proposed project
- Identification of potential capacity limitations
- Preliminary infrastructure routing options
- Identification of potential system upgrades
This type of analysis is typically conducted during site selection or early due diligence. By identifying potential electrical constraints early, developers can make more informed decisions about site feasibility and project planning.
What Is a Load Letter?
A load letter is a document issued by the electric utility provider that confirms the estimated electrical demand for a proposed development project.
The letter is typically based on load calculations provided by the project engineer or design team. These calculations estimate how much electricity the project will require once it is operational.
Utilities use load letters to evaluate service requests and begin planning for future connections or system upgrades. In many jurisdictions, a load letter may also be required during the permitting or utility coordination process.
Information Typically Included in a Load Letter
Load letters typically include:
- The estimated electrical demand for the project
- The type of service required
- Confirmation that the utility has received the load request
- Preliminary utility review of service feasibility
While a load letter helps utilities understand the projected demand, it does not provide the same level of infrastructure analysis that a power feasibility study offers.
Power Feasibility Study vs. Load Letter: Key Differences
Although both documents relate to electrical demand, they serve different roles within the development process.
| Category | Power Feasibility Study | Load Letter |
| Purpose | Evaluates infrastructure capacity and routing options | Confirms projected electrical demand |
| Prepared By | Development consultant or engineering team | Electric utility provider |
| Development Stage | Early due diligence or site feasibility | Later planning and utility coordination |
| Level of Analysis | Detailed infrastructure and capacity review | Basic confirmation of load requirements |
In short, a power feasibility study helps developers determine whether a site can support the required electrical demand, while a load letter formally communicates the project’s load requirements to the utility provider.
When Developers Need Both
In many projects, both documents are used together as part of the development planning process.
A power feasibility study often comes first. It helps developers understand whether a site has sufficient electrical capacity before they commit to purchasing land or advancing design.
Once the project moves forward and electrical demand calculations are finalized, the project team typically submits those requirements to the utility provider. The utility then issues a load letter confirming the anticipated demand and beginning the process of planning service connections.
Using both tools together helps developers:
- Confirm site viability early
- Coordinate infrastructure planning with utilities
- Support permitting and design coordination
- Reduce risk during project financing and approvals
How Early Utility Planning Prevents Project Delays
Electrical infrastructure planning is often one of the longest lead time items in a development project. Utility upgrades, new substations, or distribution extensions can take significant time to design and construct.
Identifying Capacity Limitations Before They Impact the Project
Conducting a power feasibility study early allows developers to identify potential capacity limitations before they become major obstacles. It also provides an opportunity to coordinate with utility providers early in the planning process.
Early planning can help projects avoid:
- Unexpected electrical infrastructure upgrades
- Design revisions caused by power limitations
- Construction delays while waiting for utility approvals
For high-demand projects such as data centers, early electrical planning is often essential to maintaining realistic project timelines.
Planning for Power Early Keeps Development Projects on Track
Understanding the difference between a power feasibility study and a load letter is an important part of development planning. While both relate to electrical demand, they serve distinct roles within the project lifecycle.
A power feasibility study helps determine whether a site can support a project’s electrical needs by evaluating existing infrastructure and potential upgrades. A load letter, issued by the utility provider, confirms the project’s anticipated electrical demand and supports utility coordination.
By incorporating both into early planning and due diligence, developers can reduce risk, improve project timelines, and make more informed decisions about site feasibility.
How DFM Supports Early Power and Infrastructure Planning
DFM Development Services specializes in supporting developers during early stage due diligence and infrastructure planning. Through detailed feasibility analysis and utility coordination, our team helps ensure projects have the infrastructure support needed to move forward successfully.
Contact DFM Development Services today to learn how early infrastructure planning can support your next development project.
Frequently Asked Questions
What is included in a power feasibility study?
A power feasibility study typically evaluates nearby substations, distribution infrastructure, and available electrical capacity. It also analyzes the project’s estimated demand and identifies potential infrastructure upgrades that may be required.
Who issues a load letter?
A load letter is issued by the electric utility provider after reviewing the projected electrical demand submitted by the project engineer or design team.
When should developers request a power feasibility study?
Power feasibility studies are usually conducted during early site evaluation or due diligence. This allows developers to confirm electrical capacity before committing to land acquisition or final design.
Do data centers require both a load letter and a power feasibility study?
In many cases, yes. Data centers have extremely high electrical demands, so developers often perform a feasibility study first to confirm site capacity. A load letter is then submitted to the utility to begin formal service planning.
