Utility capital plans for capacity upgrades

A public hosting capacity map tells you what’s true now. A rate case docket, filed months or years earlier, tells you what a utility already knows is coming.

Utility capital plans can identify proposed infrastructure work and its regulatory status. A proposed project is not evidence that additional capacity is already available. NYSEG and RG&E are not covered by this service; no individual substation values from their filings are reproduced here.

How a constraint gets funded

As a hypothetical illustration, a circuit rated at 12 MW with a 10 MW planning peak and 2.5 MW of assumed additional coincident load would exceed the assumed rating. These are invented figures, not observations from a utility circuit. The utility would need to assess the assumptions and the appropriate response.

Once a circuit trips that trigger, utilities search for other alternatives before building something new. Rate case testimony from a California utility describes a sequencing logic:

• Check for cheaper operational or configuration fixes first.
• Then evaluate genuine infrastructure alternatives for technical feasibility.
• Only then select whichever solution is most cost-effective among the options that solve the constraint.

Some constrained circuits get a relatively modest fix, such as reconfiguring how load is split across existing equipment, while others end up needing the kind of multi-year, multi-million-dollar substation project that shows up as its own line item in a rate case.

General system-wide capacity investment typically gets recovered through rate base, spread across the whole customer population the same way most infrastructure costs are. But a project driven specifically by one large customer’s request is different in several regions. Silicon Valley Power, for example, directly assigns the full cost of a dedicated substation to the customer whose load required it. AEP Ohio’s line-extension policy assigns a defined share, 40% in the case of non-residential customers, of certain extension costs directly to the customer benefiting from them.

The same nominal upgrade can mean “the utility is already planning to construct this on everyone’s dime” or “you would be paying a meaningful share of this yourself,” and the difference is only visible from reading how the project is characterized in the filing that first proposed it.