What's included
Solar projects are permitting and interconnection projects long before they are construction projects. The template reflects that ordering:
- Development & feasibility, Site control, pre-feasibility, solar resource assessment, preliminary layout and the initial financial model.
- Interconnection & environmental, Interconnection application and system impact study, environmental assessment, wetlands and habitat surveys. Milestone: interconnection agreement.
- Design & permitting, Conceptual and civil design, geotechnical survey, local permits, conditional use and building approvals. Milestone: notice to proceed.
- Procurement, Modules, inverters, tracker or racking systems, transformers and cable ordered against long lead times.
- Civil & mechanical construction, Mobilization, access roads, grading, fencing, pile driving, racking, module install and DC wiring.
- Electrical & commissioning, Combiner boxes, inverters, substation, testing, utility witness test and energization. Milestone: commercial operation.
Who uses this template
Renewable energy developers, EPC contractors, and solar project managers use this to plan a utility-scale build. It sequences feasibility, grid interconnection, permitting, module and inverter procurement, racking, and commissioning, so long-lead approvals and equipment orders are placed early enough to keep boots-on-site construction moving toward energisation.
How to customize it
- Set the target commercial operation date and work backwards, most solar schedules are driven by a PPA or tax-credit deadline.
- Extend the interconnection phase to match your utility's actual queue position and study timeline.
- Scale civil works to site size; pile driving and racking dominate the labour curve on large sites.
- Add a weather allowance to grading and pile driving, which are the most weather-exposed activities.
- Mark notice to proceed, mechanical completion, substantial completion and commercial operation as milestones.
Scheduling tips
- Track long-lead equipment against the build, not the calendar. Transformers and high-voltage gear have the longest lead times and are frequently the reason energization slips.
- Sequence the utility witness test carefully. It needs the utility's availability, not just yours, so treat it as a dependency with external float.
- Keep DC and AC scopes on separate tracks. They run partly in parallel and are usually delivered by different crews.
- Watch the module delivery curve. Install rate is limited by how fast modules arrive on site, not only by crew size.
- Re-baseline after permitting. Pre-permit dates are estimates; once approvals land, set a baseline and track variance against it.
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Frequently asked questions
How long does a utility-scale solar farm take to build?
Construction itself is often 4-9 months, but the full schedule from development through energization commonly runs 2-4 years because interconnection studies and permitting dominate the early timeline. The template lays out both stages.
What usually drives the critical path on a solar project?
Interconnection and permitting far more often than construction. Utility study queues are outside the developer's control, which is why the template puts them on the chart as first-class phases.
Can I use this for a commercial rooftop rather than a solar farm?
Yes, delete the substation, pile driving and access-road rows and shorten the interconnection phase. The permitting, procurement and commissioning sequence still applies.