The gap between a signed land option and the first shovel in the ground is almost always longer than landowners expect. Three years is common. Five years happens often enough that it's not exceptional. For a landowner watching a developer's annual option check arrive without any visible construction activity, the question is usually the same: what is actually happening?
The answer is permitting — and permitting for a utility-scale solar project breaks into layers that stack on top of each other, each with its own review authority, its own public comment process, and its own ability to delay or derail a project.
Who Actually Decides
There is no single permitting authority for a utility-scale solar project on private land. The federal government has no direct oversight role unless the project touches federal land or receives federal funding. That leaves decision-making split between county-level local government and, in some states, a state siting board.
In most of the country, local government is the primary authority. The county planning board or zoning commission reviews whether the project is an allowed or conditionally allowed use on land of that classification — and if it's conditional, the developer applies for a Special Use Permit, a discretionary approval that requires a public hearing. That process typically takes six months to a year even when a county has reviewed solar applications before.
Some states have moved this authority to the state level for projects above a certain generating capacity. Fourteen states trigger state-level siting review based on megawatt thresholds — ranging from an extreme low of 15 kW in Vermont (which effectively covers everything) to 300 MW in New Mexico. When a project crosses that threshold, the state siting board preempts the county's zoning ordinance — the county's opinion on the matter stops governing the outcome. The developer deals with a state energy commission or public utilities board instead of county planning staff.
Whether this helps or hurts the timeline depends on the state. A state siting board with defined review deadlines and experienced staff can move faster than a county processing its first solar application. But some state-level processes are slower and more politically exposed — particularly in states where the board is new or where renewable energy is contested at the legislature.
The Pre-Application Phase
Before a developer submits any permit application, they spend a year or more completing the surveys and studies that every application requires. This work can't be compressed much — the fieldwork has seasonal windows.
Wetlands delineation: A licensed professional physically walks the site and identifies any jurisdictional wetlands under Army Corps of Engineers criteria — meaning wetlands that fall under federal protection, regardless of how they look on the surface. Wetlands that appear dry most of the year still count. The survey must happen in spring or early summer, so a missed window adds months.
Wildlife surveys: For a project that might affect species listed as threatened or endangered under the Endangered Species Act (a federal law that prohibits harming covered species without a permit from the US Fish & Wildlife Service), the developer has to demonstrate that construction won't harm them — or negotiate a mitigation plan. Surveys for raptors, bats, and pollinators also have seasonal constraints and can't be rushed.
Phase 1 Environmental Site Assessment: A Phase 1 ESA is a standard due diligence step before any commercial land transaction. A consultant reviews the site's history for potential contamination — prior industrial use, underground storage tanks, anything that could create environmental liability. It's a desktop and visual review, not soil sampling. Lenders and investors require it before they'll commit capital to a project.
A developer who starts all this immediately after signing an option agreement still needs 12 to 18 months before they have a complete application package. A developer who encounters something unexpected — wetlands in the project footprint, a listed species that requires a design change — can add another year.
The Application Itself
Once the environmental package is assembled, the developer files with the relevant permitting authority — county, state, or in some cases both simultaneously.
At the county level, the review sequence is typically: completeness check by planning staff, technical review against the zoning code, and then a public hearing. The hearing is where community opposition materializes. Neighboring landowners, agricultural preservation advocates, or residents concerned about visual impact can speak against the project, and a county board that's sympathetic to objectors can impose conditions requiring the developer to revise the site layout and restart part of the review.
Some counties have responded to sustained pressure by declaring moratoria — temporary freezes on all solar permit applications while the county updates its ordinance. A developer with a complete application in hand can find the review suspended for months while the county works through a policy process that has nothing to do with their specific project.
What NEPA Covers and What It Doesn't
NEPA — the National Environmental Policy Act — requires federal agencies to assess the environmental consequences of projects they fund, approve, or carry out. On private land, NEPA doesn't apply unless there's a federal nexus: federal land involved, a federal permit required (such as an Army Corps permit for wetland impacts), or federal financing.
Where NEPA does apply, it requires either an Environmental Assessment (EA) or a full Environmental Impact Statement (EIS). An EA is a shorter analysis — four to six months — that either concludes the project has no significant environmental impact (formally called a Finding of No Significant Impact, or FONSI) or determines that a full EIS is required. A full EIS involves detailed study of impacts on air, water, wildlife, and land use; public comment periods; and agency responses. Research by Resources for the Future found that for projects requiring an EIS, the review process alone averaged one to two years — and one-third of those projects faced legal challenges from environmental groups or tribal representatives after the review concluded.
For most private-land solar projects, NEPA never enters the picture. But when it does — for projects on Bureau of Land Management land, for projects seeking a Department of Energy loan guarantee, or for projects requiring Army Corps permits for wetland impacts — it adds one to two years and real legal exposure.
The Interconnection Track Runs Parallel
While the land use permitting is underway, the developer is simultaneously working through the interconnection queue — the line of projects waiting for a grid operator (called an ISO or RTO, such as ERCOT in Texas, PJM in the mid-Atlantic, or MISO in the Midwest) to study and approve their grid connection. These two tracks run in parallel, but they rarely finish at the same time.
In congested grid regions — west Texas, parts of MISO territory, PJM in the mid-Atlantic — the interconnection queue adds two to four years beyond whatever land use permitting requires. Projects that have cleared every local permit and hold a signed lease are still waiting on a grid study result before they can move to construction.
What Actually Takes Longest
In practice, the timeline for a utility-scale project on private land looks roughly like this:
| Phase | Typical duration | Who controls it |
|---|---|---|
| Option agreement + pre-application surveys | 12–18 months | Developer |
| Local land use / Special Use Permit review | 6–18 months | County planning board |
| State-level siting review (where applicable) | 6–24 months | State energy commission |
| Interconnection study | 2–5 years | Grid operator (ISO/RTO) or utility |
| Construction permitting | 2–6 months | County building department |
None of these phases run strictly sequentially — developers submit interconnection applications before surveys are done, file permit applications before the environmental package is finished. But in congested grid regions, the interconnection study almost always sets the outer limit on when construction can start, not the land use permit.
A landowner who signed an option agreement in 2022 and has not seen construction activity is most likely waiting on a grid study result. The permitting may already be complete. The developer may have every county approval in hand. But without interconnection approval, nothing gets built — and no amount of permit work changes that.
Sunnyplans maps parcel-level substation proximity and SunnyScore ratings across US states — the grid distance on each listing is the variable that most directly determines which parcels clear the interconnection filter developers run before committing to a site.