Backup Generators

  • Generators should be used only in strict accordance with manufacturer specifications and in compliance with local codes.
  • Portable generators should be operated not only outside, but well away from buildings due to risk of carbon monoxide being pulled into structures.

More generator safety tips are available from

Powering your home or business

  • A portable generator should not be connected to power your entire home unless you have received all required approvals for use of a transfer switch and it has been installed by a trained professional.
  • Failure to meet this requirement can risk public safety, your neighbors’ safety, TNMP line crew members’ safety and your safety.
  • Non-portable generators can be used to power all or part of your entire home or business, but also require transfer switches upon installation.

Transfer switches: steps to take

TNMP allows use of open transition (break-before-make) transfer switches.

Ask your electrical contractor to prepare a one-line diagram of the proposed design (download example PDF).

Prepare an e-mail that includes:

  1. The service address, including city name.
  2. Your name and daytime contact info.
  3. Your contractor’s name and daytime contact info.
  4. Information on the installation.
  5. The one-line diagram.
  6. Specifications sheet for proposed transfer switch.

Send the e-mail to backupgenerators -at- tnmp -dot- com.

Next steps

TNMP’s engineering department will review your proposal and one-line diagram, and will follow up with any questions.

If no issues are identified, TNMP will send you a letter of “NO OBJECTION” via e-mail that will allow your electrical contractor to proceed. The letter also will provide other critical information.

You will need to request a temporary disconnection by TNMP personnel. Fees will apply.

Find number and information to request temporary disconnection