Key Takeaways
- The interconnection queue is a first-come, first-served list maintained by the utility or grid operator
- Queue position determines study priority and can affect project timelines by months or years
- U.S. interconnection queues have grown dramatically — FERC reported over 2,600 GW of capacity waiting as of 2024
- Queue backlogs are a major bottleneck for solar and storage deployment nationwide
- Residential and small commercial projects typically bypass the formal queue through fast-track or simplified processes
- Understanding queue dynamics helps solar professionals set realistic project timelines for larger installations
What Is an Interconnection Queue?
The interconnection queue is an ordered list of proposed energy generation projects waiting for review and approval to connect to the electric grid. Managed by the local utility or regional transmission organization (RTO/ISO), the queue determines the sequence in which projects undergo feasibility studies, system impact studies, and facility studies.
Every grid-tied generation project above a certain size threshold must enter this queue. Projects are processed roughly in the order they were submitted, though the exact procedures vary by region and utility.
The interconnection queue has become the single biggest bottleneck in U.S. clean energy deployment. The average wait time from queue entry to commercial operation has stretched to approximately 5 years, up from under 2 years a decade ago.
How the Queue Process Works
The interconnection queue follows a structured study process. Each stage evaluates the project’s impact on grid reliability and determines any required grid upgrades.
Application Submission
The project developer submits an interconnection request with system specifications, proposed point of interconnection, and an application deposit. This establishes the project’s queue position.
Feasibility Study
A preliminary analysis determines whether the grid can physically accommodate the project at the proposed location. Identifies obvious fatal flaws and provides an initial cost estimate for any necessary upgrades.
System Impact Study
A detailed engineering analysis evaluates how the proposed project — combined with all higher-queued projects — affects grid reliability, power flow, and fault currents. This is where most upgrade costs are identified.
Facilities Study
Provides detailed engineering designs and final cost estimates for required grid upgrades. The developer receives a binding cost allocation for their share of upgrade expenses.
Interconnection Agreement
The developer and utility sign a formal agreement outlining technical requirements, cost responsibilities, and construction timelines. The project can now proceed to construction.
Queue Statistics and Backlogs
The scale of the interconnection queue backlog is staggering. Here are the numbers that solar professionals need to understand:
| Metric | Value | Source Year |
|---|---|---|
| Total U.S. queue capacity | Over 2,600 GW | 2024 |
| Solar projects in queue | Over 1,350 GW | 2024 |
| Solar + storage projects | Over 670 GW | 2024 |
| Average time in queue | ~5 years | 2024 |
| Queue withdrawal rate | ~80% of projects drop out | 2024 |
| Annual new submissions | ~400+ GW/year | 2023–2024 |
Most projects withdraw because of unexpected grid upgrade costs revealed during impact studies, changes in project economics, loss of financing, or speculative applications that were never fully committed. FERC’s Order 2023 reforms aim to reduce speculative entries by requiring higher deposits and project readiness milestones.
Queue Types: Who Needs to Enter
Not all solar projects go through the same queue process. System size and grid impact determine the pathway:
Small Residential (under 25 kW)
Typically processed through a simplified fast-track review. No formal queue position. Approval in days to weeks. Most residential solar installations fall into this category.
Small Commercial (25–500 kW)
May qualify for expedited review if the local circuit has sufficient hosting capacity. Screens are applied to determine if a full study is needed. Weeks to a few months typical.
Large Commercial (500 kW–5 MW)
Enters the distribution-level interconnection queue. Requires feasibility and impact studies. Timeline: 6–18 months depending on the utility and queue backlog.
Utility-Scale (5+ MW)
Enters the transmission-level queue managed by the RTO/ISO. Full study process required. Timeline: 3–7 years in congested regions. Projects may face millions in grid upgrade costs.
FERC Order 2023 Reforms
The Federal Energy Regulatory Commission issued Order 2023 in July 2023 to address the growing queue backlog. Key changes include:
| Reform | What Changed |
|---|---|
| Cluster Studies | Projects are studied in groups rather than serially, speeding up the overall process |
| Higher Deposits | Increased financial commitment requirements to deter speculative applications |
| Readiness Requirements | Projects must demonstrate site control and other development milestones |
| Study Deadlines | Utilities face stricter timelines for completing studies |
| Withdrawal Penalties | Projects that withdraw late in the process forfeit a larger portion of their deposit |
Practical Guidance
- Check hosting capacity maps first. Before designing a large system, review the utility’s hosting capacity map to identify circuits that can accommodate the project without triggering expensive upgrades.
- Size systems within fast-track thresholds when possible. Keeping system capacity below the utility’s fast-track limit (often 25 kW or the circuit’s minimum daytime load) avoids the formal queue entirely.
- Use solar design software to model multiple scenarios. Design both a full-capacity option and a reduced-size option that avoids the queue, so customers can compare timelines and economics.
- Document the point of interconnection. Clearly identify the proposed interconnection point in your design documents — the utility will need this for study scoping.
- Submit applications as early as possible. Queue position is established at submission. For commercial projects, submit as soon as the system design is finalized.
- Budget for study costs. Feasibility and impact studies require deposits that are only partially refundable. Build these costs into your project budget.
- Track queue status regularly. Monitor your project’s position and study progress. Missed deadlines or responses can result in losing your queue position.
- Be prepared for upgrade cost allocation. Grid upgrade costs identified during studies can significantly affect project economics. Have a go/no-go threshold established with the customer before studies begin.
- Communicate timelines honestly. For commercial projects that require queue entry, explain that the interconnection process alone may take 6 to 18 months before construction can begin.
- Offer phased approaches. Propose a smaller initial system that avoids the queue, with plans to expand later. This gets the customer generating savings sooner.
- Use solar proposal software to present scenarios. Show side-by-side comparisons of a fast-track system vs. a full-capacity system that requires queue entry, with timeline and ROI differences clearly illustrated.
- Differentiate on expertise. Your knowledge of interconnection queue processes is a competitive advantage. Customers working with installers who understand the queue process are less likely to face surprise delays.
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Frequently Asked Questions
What is the interconnection queue for solar projects?
The interconnection queue is the ordered list of energy projects awaiting utility review and approval to connect to the electric grid. Projects are generally processed in the order they were submitted. Each project must complete a series of engineering studies before receiving approval. For solar projects, the queue primarily affects larger commercial and utility-scale installations.
Do residential solar systems need to enter the interconnection queue?
Most residential solar systems do not enter the formal interconnection queue. Systems under 25 kW typically qualify for fast-track or simplified review processes that bypass the queue entirely. Approval timelines for residential systems are usually 5 to 15 business days, compared to months or years for larger projects in the formal queue.
How long does it take to get through the interconnection queue?
It depends on system size and location. Small commercial projects (under 500 kW) may complete the process in 6 to 18 months. Utility-scale projects (5 MW and above) currently average about 5 years from queue entry to commercial operation, though FERC Order 2023 reforms aim to reduce this timeline through cluster studies and stricter processing deadlines.
What is FERC Order 2023 and how does it affect solar projects?
FERC Order 2023, issued in July 2023, is a major reform of the U.S. interconnection process. It replaces the serial study process with cluster-based studies, increases financial deposits to deter speculative applications, establishes project readiness requirements, and sets stricter study completion deadlines. The goal is to reduce the massive queue backlog and accelerate the connection of solar and storage projects to the grid.
About the Contributors
CEO & Co-Founder · SurgePV
Keyur Rakholiya is CEO & Co-Founder of SurgePV and Founder of Heaven Green Energy Limited, where he has delivered over 1 GW of solar projects across commercial, utility, and rooftop sectors in India. With 10+ years in the solar industry, he has managed 800+ project deliveries, evaluated 20+ solar design platforms firsthand, and led engineering teams of 50+ people.
Content Head · SurgePV
Rainer Neumann is Content Head at SurgePV and a solar PV engineer with 10+ years of experience designing commercial and utility-scale systems across Europe and MENA. He has delivered 500+ installations, tested 15+ solar design software platforms firsthand, and specialises in shading analysis, string sizing, and international electrical code compliance.