Prospecting and screening
Prospecting is the search for land that can plausibly host a project, and screening is the fatal flaw analysis of each candidate. To advance, a site needs enough buildable acreage after setbacks, slope, wetlands, and floodplain are removed, a candidate point of interconnection with plausible headroom, an ordinance that allows the use, and a preliminary layout and yield that support the pro forma. Screening commonly takes days to weeks per site.
It slips when the screen is too shallow. Teams that look only at parcel size and distance to a line discover after signing an option that the substation is full, the county has a moratorium, or half the acreage is jurisdictional wetland. Diligence is cheapest here, because the site can still be walked away from at no cost.
Site control
Site control is an enforceable right to use the land, usually an option to lease or purchase, sometimes a direct lease or purchase agreement. To advance, the developer needs signed agreements covering the array, the gen-tie route, and access, with enough contiguous acreage for the target capacity. One landowner can take weeks; a multi-parcel assembly commonly takes several months to a year.
The terms that matter most are the option period and its extensions, since the land must be held through interconnection and permitting; the payment schedule; rent or price and escalator; the right to assign to a project company and lenders; decommissioning obligations; and a title contingency. Short option periods are the classic failure, forcing renegotiation from a weak position after studies are paid for. Severed mineral rights and unrecorded easements can take months to cure, so order title early.
Interconnection
Interconnection is obtaining a binding agreement to connect the plant to the transmission or distribution system. It runs in three phases: an application with a deposit and evidence of site control, study phases that estimate required network upgrades and their cost, and an interconnection agreement that fixes scope, cost allocation, and schedule. Each phase requires escalating deposits and readiness showings; financing requires an executed agreement with an upgrade cost the pro forma can absorb.
Duration varies more than in any other stage: commonly two to five years from application to signed agreement, longer in congested queues. The most common slip is an upgrade cost assignment that makes the project uneconomic, followed by restudies triggered when higher-queued projects withdraw. Developers manage this by filing early with a defensible project shape, benchmarking assigned costs against neighbors, and settling a withdrawal framework before each deposit deadline.
Permitting and entitlements
Permitting is the set of governmental approvals needed to build. For most projects the central approval is a local conditional use or special use permit from the county or township, decided by a planning commission and board after public hearings. Some states route larger projects through a state siting board instead of, or in addition to, local review. To advance, the project needs land use approval with acceptable conditions, plus stormwater and construction general permit coverage.
Environmental studies run underneath the land use process and usually cause the delays. Wetlands delineation, cultural resource surveys, and threatened and endangered species surveys each have field seasons, so a missed spring or summer window can push the schedule a full year, and agency consultation adds months. Local approval commonly takes six to eighteen months; organized opposition, a moratorium, or a mid-process ordinance rewrite stretch it further. Conditions of approval such as setbacks, decommissioning bonds, and road use agreements follow the project through construction.
Offtake and revenue
Offtake is the contracted or expected revenue that makes the project financeable. The main structures are a power purchase agreement with a utility or corporate buyer, merchant sales into the wholesale market, a financial hedge such as a revenue put or fixed-price swap, and, for smaller projects, community solar subscriptions. To advance, lenders and tax equity need enough contracted or hedged revenue to size the debt, from a creditworthy counterparty, on a term that matches the financing.
Winning a PPA through a utility solicitation or corporate procurement commonly takes six to eighteen months from bid to execution, and the project usually needs interconnection visibility and permitting progress to be short-listed. The stage slips when interconnection cost or COD moves after the price was bid, forcing renegotiation, or when the buyer's approval cycle runs long. Community solar programs add their own queues and capacity caps.
Financing
Financing arrives in layers. Development capital, usually the sponsor's balance sheet or a development partner, funds deposits, studies, and permits and is at risk until notice to proceed. Tax equity monetizes the investment or production tax credit, and transferability now allows credits to be sold to an unrelated buyer for cash. Construction debt funds the build and converts to term debt, sized against contracted cash flow, at commercial operation.
To reach financial close, the project needs an executed interconnection agreement, discretionary permits past their appeal periods, site control through the term, an offtake contract or hedge, a fixed-price EPC contract, equipment supply agreements, an independent engineer report, and clean title and survey. Closing commonly takes three to six months. It slips when one item is not actually final: a permit under appeal, an upgrade cost subject to restudy, or a module contract with unresolved traceability documentation.
Lenders diligence the energy yield and its probability cases, interconnection cost and schedule, permit conditions, the EPC contractor's balance sheet and liquidated damages, equipment warranties, offtake counterparty credit, real estate, insurance, and tax credit eligibility, including prevailing wage and apprenticeship compliance where it applies.
Engineering and procurement
Engineering advances the design from screening layout to an issued-for-construction package in stages, commonly labeled 30, 60, and 90 percent, each locking decisions the next depends on: array boundaries and setbacks, then racking and civil grading, then electrical single lines, cable sizing, and the substation. An independent engineer reviews the design, yield model, and construction contract. To advance, the project needs an IFC design that matches the permit set and a signed EPC contract.
Procurement runs alongside. Modules, inverters, and trackers are ordered against the design, and long-lead items, above all the main power transformer and high-voltage breakers, must be ordered well before notice to proceed because their lead times can exceed a year. The stage slips when a late design change forces re-permitting or re-procurement, or when a supply contract cannot satisfy lender requirements on traceability, domestic content, or warranties.
Construction
Construction begins at notice to proceed, when financing is closed and the EPC contractor is released to mobilize. It proceeds in overlapping phases: civil work including clearing, grading, roads, and stormwater controls; mechanical installation of piles, racking, and modules; electrical work including trenching, collection, inverters, substation, and gen-tie; and commissioning and energization. To advance, the utility must complete witness testing and the plant must pass its contractual performance tests.
Construction commonly takes eight to eighteen months depending on size and terrain, and it is the most predictable stage because it is contracted with schedule guarantees. It slips for weather, seasonal restrictions in permit conditions, delayed transformer or breaker deliveries, utility crews unavailable for the substation tie-in, and labor shortages where several large projects build at once.
Commercial operation and operations
Commercial operation date is the point at which the project is complete, connected, and delivering power under its agreements. Reaching it triggers term debt conversion, the start of the PPA, and the tax credit placed-in-service date. To declare COD, the project needs the utility's permission to operate, completed performance testing, and an independent engineer certificate. These steps commonly take one to three months after mechanical completion.
Operations then run for the life of the asset: operations and maintenance, asset management, performance monitoring, and compliance reporting under permit conditions and the interconnection agreement, with decommissioning obligations due at the end. Early operations slip when punch list items linger, when the offtaker has not accepted the monitoring system, or when utility meter and telemetry acceptance runs behind.
What runs in parallel and where the critical path sits
Little of this runs strictly in sequence. Interconnection is filed as soon as site control supports it and runs for years underneath everything else. Permitting starts once the application is in and the layout is stable enough for a public hearing. Offtake bidding begins when study results give the project a credible cost and date. Design advances with permitting because the permit set and engineering set must agree. Long-lead equipment is often ordered before financial close.
The critical path usually sits in interconnection, because the study cycle is outside the developer's control and every other workstream needs its output to finalize. Permitting is second, driven by survey seasons and hearing calendars, and equipment lead times have been third. The practical implication is to screen grid position and ordinance posture before site control, since those two factors decide which sites remain viable when the interconnection agreement arrives. Modern screening tools such as Basepoint put parcels, hosting capacity, ordinances, and layouts in one place for that early pass.