Connections to the grid
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The transmission system provides a pathway for power among interconnected power producers, or generators, and distribution companies, or load. American Transmission Co. actively coordinates with MISO and the interconnected entity to develop and implement both new interconnections and modifications to existing interconnections.
MISO administers all interconnections of new generation directly to the ATC transmission system. The ATC Generating Facility Interconnection Guide (updated on August 31, 2021) supplements MISO’s requirements and describes ATC’s minimum requirements for the connection of such generation.
While MISO’s Tariff generator interconnection process may not specifically apply to modifications made to existing generators or associated interconnections, ATC requests that generator owners communicate with ATC for review of proposed modifications that are reasonably anticipated to impact the ATC transmission system by completing and attaching the form in an email to GIOANotices@atcllc.com.
To communicate a planned change to a generating unit please complete the form, save, and submit to the email address above. Please include any pertinent documentation that will assist ATC in the evaluation of the proposed modifications.
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The ATC Transmission Interconnection Guide (updated on November 29, 2021) supplements MISO Business Practices for transmission interconnections, describing ATC’s role along with specific guidance for design, construction and operational aspects of a transmission interconnection project.
ATC requests that neighboring transmission owners communicate with ATC for review of proposed new interconnections or modifications to existing interconnections that are reasonably anticipated to impact the ATC transmission system by completing and attaching the form in an email to T-DLIRFS@atcllc.com.
Transmission Interconnection Request Form (TIRF) (updated on January 1, 2016)
ATC Load Interconnection Guide (updated on December 10, 2021) describes ATC’s minimum requirements and process for the connection of load to ATC’s transmission system.
ATC requests that distribution companies communicate to ATC for review of proposed new interconnections or modifications to existing interconnections that are reasonably anticipated to impact the ATC transmission system by completing and attaching the form in an email to T-DLIRFS@atcllc.com.
To request a new load interconnection or a modification to an existing load interconnection, complete the following form, save, and submit to the email address above.
Load Interconnection Request Form (LIRF) (updated December 18, 2020)
Distributed Energy Resource (DER) Request Form (published July 2, 2021)
Project Commitment Agreement (updated January 2, 2019)
Joint Best Value Planning White Paper (updated January 18, 2016)
Asset Modification Form
Communication Infrastructure Interconnections
ATC Communication Infrastructure Interconnection Guide (published December 20, 2021)
TOP-003 Data Specification
- Pursuant to NERC Reliability Standard TOP-003, ATC, as a NERC-registered Transmission Operator (TOP), has a document specification for data needed to support Real-time monitoring, Operational Planning Analyses, and Real-time Assessment of its TOP Area (ATC’s TOP-003 Data Specification Version 1.2, dated April 1, 2021).
- FM-9120- Protective Relay, RTU, or Communication Channel Testing Request Form (for IEs without TOA access)
- IEs should complete this form whenever they plan to disable or remove from service an IE-owned protection scheme that provides protection of ATC-owned equipment.
- Outage Request Form and Instructions (for IEs without TOA access)
- IEs should complete this form whenever they need clearance on ATC-owned equipment.
- Completed forms should be emailed to firstname.lastname@example.org for review.
Facility and Equipment Testing Communication
- Generator Testing Request Form (Updated July 6, 2022) IEs should complete this form such that reactive power testing can be coordinated between ATC and interconnected generating facilities.
- Coordination of Testing of Interconnected Entity (IE) Equipment: The Interconnected Entity Testing Guide (GD-2001) is available to assist in identifying risk associated with this work. IEs should contact ATC account manager for assistance with risk identification and further address any identified risk whenever they plan to test equipment in the following types of substations:
- All substations where generation is connected to the transmission system.
- All distribution substation with protection schemes that trip ATC-owned circuit breakers, circuit switchers or lockout relays, or distribution substations that have equipment connected to ATC-owned bus differential schemes.