The short answer
Wires, meters, billing infrastructure stay with the utility.
The single most common misconception about switching your energy supplier is that the utility itself is changing. It is not. In every deregulated state, the utility owns and operates the wires, meters, and outage response by regulatory mandate. The supplier is a separate market layer that sits on top of the utility. This guide walks through the structural separation, why it exists, and what each side actually owns on every bill.
Why the structural split between utility and supplier exists
In the 1990s a wave of US states moved to deregulate the retail electricity market. The starting condition was vertically integrated utilities — a single company owned the generators, the transmission lines, the local distribution wires, the meters, and the billing relationship with end-customers.
Deregulation forced these utilities to separate ownership of generation from ownership of wires-and-meter, and to allow third-party licensed suppliers to compete on the supply portion of the bill. The wires-and-meter side stayed regulated because duplicating physical infrastructure to allow competition would be expensive and counter-productive.
The supply side became competitive. Suppliers — Retail Electric Providers (REPs) in Texas, ESCOs in New York, just "suppliers" elsewhere — buy electricity wholesale and resell it at a per-kWh rate. The PUC licenses them, but does not set their rates.
Who owns what on the bill, line by line
On a residential bill the utility owns the distribution charge, the transmission charge, the capacity reservation, the customer charge, and any state riders or universal service fund line items. The supplier owns the generation supply line.
The dollar split is roughly 38% utility / 62% supplier on most residential accounts. On commercial accounts with a demand charge, the split moves toward 53% utility / 47% supplier — the demand charge is a delivery-side line item set by the utility tariff.
Switching the supplier changes only the supplier-side dollars. The utility-side dollars are unchanged.
Infographic
Residential bill — what the utility bills vs what the supplier bills
Why outage response and reliability are unchanged
Reliability is a utility-tariff obligation enforced by the state PUC. The utility is required to maintain the grid, respond to outages, and meet specific reliability metrics — System Average Interruption Duration Index (SAIDI), Customer Average Interruption Duration Index (CAIDI), etc. — regardless of who supplies the kWh flowing through the wires.
In practice this means the same utility crews respond to the same outages the same way, on the same SLA, whether you are on the default supplier or a competitive supplier. The supplier is not in the outage chain at all.
Customer service for service issues — power out, meter problem, billing dispute on the delivery line — also stays with the utility. The supplier is only in the loop for billing disputes on the supply line.
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