Dec 5, 2025|News

Are You Ready for January's SERC Interconnection Window Openings?

By Horea Catanase

The Southeast U.S. is rapidly becoming one of the most competitive regions for renewable energy development. With many Southeastern Electric Reliability Council (SERC) region utilities preparing to open their 2026 interconnection queue windows early next year, developers and Independent Power Producers (IPPs) must act decisively as soon as possible.

Two major interconnection windows open next month. Read the details below to find out how you can prepare now.

Santee Cooper (DISIS Cluster)

Interconnection Window: 150 days, opens January 1, 2026
Key Challenges: Limited transmission capacity, evolving study process, coordination with neighboring utilities required
Recent Changes: New process in effect, PSCAD models need to be included in application

Tennessee Valley Authority (TVA)

Interconnection Window: 45 days, opens January 15, 2026
Key Challenges: Unique federal oversight, balancing renewables with existing hydro and nuclear generation, navigating the complexities of the resource solicitation cluster requirements
Recent Changes: TVA recently filed tariff revisions to align with Order 2023A

EPE specializes in helping energy developers and IPPs navigate complex interconnection landscapes across the SERC region and the rest of the U.S. Our team of grid experts, engineers, and regulatory specialists can provide data-driven insights and strategic guidance to help your SERC project move forward efficiently.

To learn more and map out your strategy for securing queue positions, reducing risks, and accelerating your renewable energy projects within SERC, contact our team of experts using the form below.

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About the Author

Horea Catanase

Horea Catanase is EPE's Vice President, Interconnection Services. He has extensive experience leading complex consulting projects across electricity networks in North America, Europe, and the Middle East. Horea oversees EPE’s Interconnection Services across ERCOT and the Eastern Interconnect (SPP, MISO, PJM, ISO New England, NYISO and SERC), leading a high-performing global team of over 100 professionals. He leverages deep technical expertise with commercial leadership to drive cross-regional delivery teams and deliver best-in-class solutions across clients’ portfolios. He is deeply passionate about building and leading high-performing teams, mentoring talent, optimizing processes, and driving meaningful contributions to the energy industry's transition toward a more sustainable future.

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Two major interconnection windows open next month. Read the details below to find out how you can prepare now.

Santee Cooper (DISIS Cluster)

Interconnection Window: 150 days, opens January 1, 2026
Key Challenges: Limited transmission capacity, evolving study process, coordination with neighboring utilities required
Recent Changes: New process in effect, PSCAD models need to be included in application

Tennessee Valley Authority (TVA)

Interconnection Window: 45 days, opens January 15, 2026
Key Challenges: Unique federal oversight, balancing renewables with existing hydro and nuclear generation, navigating the complexities of the resource solicitation cluster requirements
Recent Changes: TVA recently filed tariff revisions to align with Order 2023A

To learn more and map out your strategy for securing queue positions, reducing risks, and accelerating your renewable energy projects within SERC, contact our team of experts using the form below.