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Letter of guarantee: what it means

A letter of guarantee is a written promise that can replace the cash deposit an electric company asks for when you cannot show good credit. In Texas, certain electricity providers (the affiliated provider and the provider of last resort) must offer it; the person who signs as guarantor pays your bill if you do not, but only up to the amount written in the agreement.

In Spanish it is

Carta de garantía (letter of guarantee)

Also written as: guarantor · utility guarantor · guarantee agreement

The full explanation

In Arizona, the letter can come from a government or nonprofit entity. In Florida, a guarantor who is a customer of the utility with a good payment record can establish your credit.

An example

Sofía moves to Texas and has no history with any electricity provider. Her provider, the affiliated one in her area, offers a letter of guarantee. Her sister, a customer of the same provider, signs it, and Sofía does not have to pay the cash deposit.

You will see it in…

  • The electric service application when you are asked for a deposit
  • The guarantee agreement your guarantor signs
  • Notices to the guarantor if the customer does not pay
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A HUD-approved housing counselor can walk you through it. Agencies usually charge little or nothing, many work in Spanish, and they do not sell you anything.

Official sources

We sum up what these official sources say, in plain words. We add no rules they do not state; when a rule changes, the definition and its date change.

  1. 1. Legal Information Institute (Cornell Law School) · 16 Tex. Admin. Code § 25.478: credit requirements and deposits (guarantees of residential customer accounts) (external site) · in English · Verified on October 17, 2026
  2. 2. Legal Information Institute (Cornell Law School) · Ariz. Admin. Code R14-2-203, Establishment of service (electric utilities) (external site) · in English · Verified on October 17, 2026
  3. 3. Legal Information Institute (Cornell Law School) · Fla. Admin. Code Ann. R. 25-6.097: customer deposits (electric utilities) (external site) · in English · Verified on October 17, 2026