Who pays for a new substation?

That is set by tariff and contract, not by press release. Ask whether the interconnection agreement puts the substation, feeders, and transmission upgrades on the customer or the rate base.

Electricity

Will a data center raise my electric bill?

Q: Will a data center raise my electric bill?

It depends. If the developer pays the full cost of interconnection, generation, and transmission upgrades under a large-load tariff, the effect on residential rates can be small or negative. If those costs are socialized, it can be positive.

It depends. Anyone who answers yes or no without talking about tariffs, generation, and who pays for the substation is selling a bumper sticker.

What can raise bills

New generation built for peak and paid by everyone
Transmission that is socialized
Fuel mix shifting toward gas on hot days
A project that interconnects and then never loads — stranded wires

What can hold bills down

Dedicated substations and customer-funded upgrades
Contracts that recover costs, with clawbacks
High load factor that uses plants already paid for
Curtailable load during ERCOT emergencies

ScenarioScenario — not a rate forecast

Move the load. Watch the story change.

Hypothetical incremental data-center load: 100 MW

100 MW is 1.7% of a ~6 GW municipal system if you treat that as the whole pie. CPS’s actual peak and resource mix are not a single number in this box.

Assumption: interconnection and the substation are paid by the customer, with a clawback if the load never shows up.
Assumption: some of the load can drop or shift when ERCOT is tight.
CPS has said existing data-center contracts are written to recover costs. A future rate case can still move if the generation plan changes.
This tool will not print a household dollar impact. There is no public tariff model here that would make that number honest.

Data last checked 2026-09-04 · Current public data is a snapshot, not a live meter

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