Dedicated Infrastructure Riders: The Most Equitable Way to Recover Large Load Facility Costs

When a utility builds a 345-kilovolt substation to serve a single large load customer, the question of cost recovery is not subtle: who should pay for an asset that serves one customer and would not exist but for that customer’s load?

The answer, in most well-structured large load agreements, is the large load customer. The mechanism for ensuring that result—cleanly, transparently, and in a way that regulators can review and ratepayers can understand—is a dedicated infrastructure rider.

Dedicated infrastructure riders are not new to utility rate design. They have been used for years to recover costs associated with large industrial facilities, military installations, and other special-purpose customers whose load requirements demand infrastructure that cannot be generalized across the rate base. What is new is the scale of data center load and the corresponding scale of the infrastructure investment that these agreements now require utilities to make.

What a Dedicated Infrastructure Rider Does

A dedicated infrastructure rider is a rate mechanism that isolates the cost of specific utility infrastructure—transmission lines, substations, protective relaying, switching equipment, and other capital investments—and assigns recovery of those costs directly to the customer or customers that necessitated the investment.

Unlike base rates, which pool infrastructure costs across all customers in a rate class, a dedicated rider creates a separate cost recovery stream tied to a specific asset or set of assets. The customer subject to the rider pays for the infrastructure through a charge that appears on their bill alongside their energy and demand charges from the applicable tariff.

The rider charge is typically calculated to recover:

• The carrying cost of the dedicated infrastructure investment (return on rate base)
• Depreciation expense over the useful life of the assets
• Operating and maintenance expenses associated with the dedicated facilities
• Property taxes and other direct costs attributable to the dedicated assets

Why Riders Are More Equitable Than Rate Base Socialization

The alternative to a dedicated rider is to put data center infrastructure into the utility’s general rate base and recover the costs from all ratepayers through base rates. This approach is simpler from an administrative standpoint, but it raises a fundamental equity problem: residential and small commercial customers who receive no benefit from a data center substation would be paying for it alongside the data center customer.

Rate base socialization made more sense in an era when large industrial loads created genuine system-wide benefits—when new factories required infrastructure upgrades that improved reliability for surrounding communities, or when large-load customers helped fund transmission investments that reduced costs for everyone. The argument that data center load produces system-wide benefits of that kind is much harder to sustain. A hyperscale facility that requires a dedicated transmission feed does not generally improve reliability or reduce costs for nearby residential customers.

Regulators are increasingly unwilling to approve rate base socialization of data center infrastructure costs without a compelling showing that general ratepayers benefit. Dedicated riders satisfy this concern directly by segregating the cost from the general rate base and assigning it to the benefiting customer.

Structuring the Rider: Key Design Choices

Asset Scope

The rider should specify precisely which assets are included. Dedicated transmission lines, dedicated substation equipment, and switching infrastructure built specifically for the data center should clearly be within scope. The harder question is how to treat shared infrastructure that was upgraded to accommodate data center load—a transmission line that was already planned but accelerated or oversized because of the data center, for example. Best practice is to include only the incremental cost of the upgrade attributable to the data center, not the full cost of shared facilities.

Rate Base Treatment vs. Pass-Through

Riders can be structured as rate base additions (where the utility earns a return on the dedicated investment) or as direct pass-throughs (where costs are recovered dollar-for-dollar without a return component). Rate base treatment is more common for long-lived capital assets like substations. Pass-through treatment may be appropriate for operating costs or for short-term construction-period carrying charges.

Term and Adjustment Mechanisms

The rider term should align with the useful life of the dedicated assets and the term of the underlying service agreement. A 20-year substation investment should not be assigned to a customer under a 5-year agreement without adequate security provisions. Riders should also include annual adjustment mechanisms that allow the charge to be updated as actual costs are incurred, preventing over- or under-recovery from accumulating over time.

Relationship to the Service Agreement

The dedicated rider should be explicitly cross-referenced in the service agreement and vice versa. The service agreement should specify the conditions under which the rider applies, the treatment of rider obligations upon early termination, and the effect of assignment or change of control on the rider charge. See our article on Six Provisions Every Data Center Developer Agreement Should Include for more on the contractual framework.

Regulatory Treatment and Approval

Dedicated infrastructure riders typically require regulatory approval in jurisdictions where rates are subject to commission oversight. The approval process generally involves demonstrating that the infrastructure is genuinely dedicated to the customer, that the costs are reasonable, and that the rider structure adequately protects general ratepayers from cost exposure if the data center customer fails to perform.

Regulators reviewing rider proposals will look closely at several factors:

• Whether the infrastructure truly serves only the data center customer or has broader system benefits
• Whether the cost recovery term and structure match the expected life of the assets
• Whether adequate security provisions exist to protect ratepayers if the data center exits the agreement
• Whether the rider charge is calculated correctly and will produce neither over- nor under-recovery

Some commissions have approved riders with explicit stranded cost provisions—mechanisms that accelerate cost recovery if the data center exits early, funded by the early termination fee or security deposit described in the service agreement. This layered approach, combining a well-structured rider with adequate contract protections, provides the most complete ratepayer protection.

Accounting Implications

The accounting treatment of dedicated infrastructure and the associated rider recovery depends on whether the assets are classified as rate base investments under ASC 980 (Regulated Operations) or treated differently based on the nature of the arrangement. Utilities should ensure that dedicated infrastructure assets are properly capitalized and depreciated in accordance with their regulatory treatment, and that rider revenue is recognized in a manner consistent with the underlying cost recovery pattern.

Where infrastructure costs are recovered through contributions in aid of construction rather than a rider, the accounting treatment shifts significantly—CIAC reduces the cost basis of the asset rather than creating a separate revenue stream. The choice between CIAC and rider treatment has implications for rate base, depreciation, and income tax treatment that utility accountants and rate professionals need to coordinate carefully.

For a deeper discussion of accounting treatment, see our article on Deferred Costs and Data Center Infrastructure: What ASC 980 Allows—and What It Doesn’t.

The Alternative: When Riders Are Not the Right Tool

Dedicated infrastructure riders are not the right mechanism for every data center cost recovery situation. Where infrastructure serves multiple customers or has genuine system-wide value, inclusion in general rate base with standard cost-of-service recovery may be more appropriate. Where the data center customer pays CIAC that fully offsets the infrastructure investment, the rider may be unnecessary or reduced in scope.

The selection of cost recovery mechanism should follow the cost causation principle: whoever causes a cost to be incurred should bear that cost. Riders are the cleanest expression of cost causation for dedicated single-customer infrastructure. Where cost causation is shared, the recovery mechanism should reflect that sharing.