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What are the Interconnection Agreement (IA) and Tariff Agreement (TA), and why do utilities require members to sign them?

Updated over 2 weeks ago

During the battery permitting process, utilities like Oncor and CenterPoint will email Base members two agreements to sign to complete the process:

Tariff Application (TA):

  • The Tariff Application applies to register your battery system with the grid, and it details the terms, rates, and conditions under which the battery interacts with the grid.

  • You should receive an email from your utility to sign your Tariff Application 3-5 business days after your home photos are approved and you've scheduled your energy service activation with Base.

Interconnection Agreement (IA):

  • The Interconnection Agreement registers your battery with the grid, and it details the technical and safety requirements to connect and operate the battery with the grid.

  • A few weeks after signing your Tariff Agreement, you should receive an email from your utility to sign your Interconnection Agreement. You may not receive this email until a few weeks after your battery installation, and you don't need to contact Base if it's taking a long time.

Best Practices for Avoiding Issues

  • If you receive a reminder from Base to sign these agreements but can't find the email from your utility, please check your spam folder.

  • Additionally, check your trash folder and ensure that messages from your utility provider are not being blocked by your email system. Cross-verify timestamps or specific delivery information with the utility provider if necessary.

  • Regularly monitor communications from your utility provider to ensure critical information (like agreements) isn't missed.

  • Proactively verify agreements and other project documentation for completeness and accuracy to prevent delays.

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