Two to five years is the range developers give when landowners ask how long interconnection takes. It's an honest answer that tells you almost nothing useful. Whether your project is sitting in an eight-month study process or a four-year restudy cycle depends on factors that have nothing to do with your land — and everything to do with which grid operator is in charge and how congested their queue is right now.
The Four Study Phases and How Long Each Takes
Getting a solar project connected to the grid requires four sequential studies. None can be skipped. Each one builds on the results of the previous one.
| Phase | What it determines | Typical duration |
|---|---|---|
| Feasibility study | Whether the project can physically connect without obvious violations | 1–3 months |
| System impact study | Transmission constraints, required upgrades, cost allocation | 3–6 months |
| Facilities study | Final engineering and cost confirmation for all required grid work | 3–6 months |
| Interconnection agreement | Contract execution; grid connection formally approved | 1–3 months |
A project that clears all four phases without complications takes 8 to 18 months. That's the floor, and it applies to a small fraction of projects. Most projects in congested territories spend 3 to 7 years in the queue before receiving a final interconnection agreement — if they receive one at all.
The gap between theory and practice comes down to one mechanism: the restudy.
What a Restudy Is and Why It Adds a Year or More
When a project ahead of yours in the queue withdraws — which happens constantly, because developers routinely file speculative interconnection applications as a hedge against study outcomes — the grid operator has to redo the study for every project behind it. The withdrawal changed the assumed grid conditions. New assumptions mean new results.
Each re-evaluation takes months. If multiple projects ahead of you withdraw in sequence, you can cycle through two or three rounds before your analysis is finalized. Each round can revise your upgrade cost requirements significantly — a $2 million estimate from the first pass can come back as $7 million after a re-evaluation, or the reverse. Projects filed in MISO and PJM territories between 2018 and 2021 routinely spent four to six years in the queue for exactly this reason, according to Lawrence Berkeley National Laboratory's annual Queued Up tracking report. Many are still waiting.
How Timelines Differ by Grid Operator
Which grid operator covers your state shapes interconnection timelines more than any other single factor. FERC does not control all grids uniformly — each ISO and RTO runs its own queue process and study schedule.
| Grid operator | Territory | Approximate timeline (2025–2026) |
|---|---|---|
| ERCOT | Texas | 2–4 years; West Texas congestion zones run longer |
| PJM | Mid-Atlantic, Midwest, parts of Southeast | 4–7 years; among the largest queue backlogs in the US |
| MISO | Upper Midwest, Central US | 3–6 years; cluster reform in progress |
| CAISO | California | 3–5 years; volume growth extended timelines post-2022 |
| SPP | Central US / Great Plains | 2–4 years; less congested than PJM or MISO |
ERCOT moves faster partly because Texas operates its own grid outside FERC's retail jurisdiction — the structure is simpler, and the single-state scope limits some of the coordination delays that affect multi-state operators. But West Texas wind and solar corridors have grown congested as development concentrated there, and projects in those zones now face timelines that approach PJM in some study cycles.
What FERC Order 2023 Changed
In 2023, the Federal Energy Regulatory Commission issued Order 2023, requiring grid operators to shift from sequential, first-come-first-served study processing to a cluster approach — evaluating groups of projects simultaneously. The stated goal was to cut total study time and reduce the restudy cascade triggered by individual project withdrawals.
Implementation is proceeding grid-operator by grid-operator through 2025 and 2026. Early results are mixed. Fewer cascading restudies have occurred in some cluster cycles, but the reforms are still working through a large existing backlog — MISO and PJM together held more than 500 GW of capacity still awaiting study as implementation began.
The practical effect for landowners: timelines are not shortening dramatically yet. The reform is structural and needs years to work through a backlog that held approximately 2,300 gigawatts of pending capacity by end of 2024.
What This Means for the Option Period on Your Land
When a developer signs an option agreement on your land, the option period — typically two to five years — exists largely to accommodate interconnection. The developer needs enough time to complete studies, receive a final interconnection agreement, and confirm whether project economics still hold before committing to a long-term lease.
Understanding how interconnection queues work helps interpret developer behavior during the option window. A developer who goes quiet for six months after signing an option is likely waiting on a system impact study result. A request for a one-year extension usually means a restudy cycle, not a project in trouble.
The real risk is that interconnection costs come back higher than the project economics can absorb. An unexpected $8 million substation upgrade requirement on a 15-megawatt project can make the deal unviable regardless of how well the land scores on every other dimension. When that happens, the developer exits the option, you keep the option payments, and the land returns to prior use.
This is also why substation proximity affects developer economics before a single study is filed. Land close to a substation with available capacity faces a shorter interconnection path and a lower risk that studies return deal-breaking upgrade requirements — a lower risk that gets priced into the lease offer from the beginning.
Sunnyplans shows substation and transformer proximity for every indexed parcel — the two distances that most directly predict interconnection timeline and cost before a developer runs formal studies.