The bore between completion and energization

From the array to the point of interconnection

Every collected feeder on a utility-scale field funnels toward one place: the gen-tie that ties the project into the grid. That gen-tie has to leave the array, cross whatever sits between the last collection point and the POI, and land inside the substation or switchyard. Almost all of that path is underground, and the hardest segments are bored, not trenched. We drill the gen-tie and interconnection crossings so the conductor arrives at the point of interconnection ready to terminate.

This is not a generic utility bore. It is the conductor that decides whether a mechanically complete field can energize. We plan it as the last thing standing between the project and commercial operation, and we sequence everything around that fact.

Why this is the highest-stakes bore on the project

On a solar build the schedule funnels into a single chokepoint at the end: energization. Modules can be set, racking torqued, inverters landed, and the field still cannot produce a kilowatt-hour until the gen-tie is in the ground, terminated, and the utility energizes the point of interconnection. The interconnection bore sits squarely in that gap.

• It is downstream of everything. Mechanical completion does not earn revenue. Energization does. The gen-tie is the last conductor between the two.
• It is on a hard date. Utility energization and witness-test windows are scheduled months out and do not move easily. Miss the bore and you miss the window, then you wait for the next one.
• It crosses the worst ground last. The approach to a POI often runs under a highway, a rail spur, or a waterway, the crossings that gate energization and carry the most permit and frac-out risk.
• It is shared scope. The bore, the switchyard buildout, and the utility's work all converge at the fence line. Any one of them can stall the others.

The bore is on the critical path. We make sure it never holds up your COD.

The last crossings before the POI

The crossings that gate energization are almost always the ones closest to the point of interconnection: a state highway, a rail line, a stream or wetland, or a corridor of existing utilities on the substation approach. These are the bores that have to be permitted, drilled, and proven before the gen-tie can land. We treat them as energization-gating work from day one.

• Highway and road crossings at the depth, casing, and bore geometry the DOT or crossing owner requires, with permit-ready profiles.
• Rail crossings drilled to the railroad's cover and encasement spec, sequenced around flagging and track-access windows.
• River, stream, and wetland crossings drilled with a written inadvertent-return plan, drilling-fluid program, and containment so a sensitive crossing does not become a permit problem.
• Existing-utility crossings located by vacuum excavation and potholing before we drill, so the gen-tie threads the corridor cleanly. See our vacuum excavation and SUE scope.

Coordination at the fence line

The interconnection scope is where the most parties meet on a solar project, and coordination failures here cost energization windows. We sequence our work against everyone who touches the POI.

• The utility or transmission owner sets the energization date, the witness-test requirements, and what has to be complete and inspected before they backfeed, under the generator interconnection procedures the project is studied against.
• The switchyard or substation contractor owns the getaway and the terminations. We hand off a clean, located, as-built conduit path at the fence so they can pull and land circuits without surprises.
• The EPC and GC schedulers get a bore plan with real durations, hold points, and a contingency line so the interconnection scope shows up correctly on their critical path.
• The inspector or authority having jurisdiction sees a documented bore, a depth-of-cover record, and an as-built that supports sign-off without a re-dig.

Conduit and duct bank at the substation getaway

The gen-tie does not just need a bore. It needs a finished, testable path into the substation. We carry the work from open ground to the getaway and hand off a circuit ready to terminate.

• Bore-to-duct-bank transition at the substation approach, tied into the getaway structure the switchyard contractor is building.
• Conduit and duct bank for the gen-tie circuits, plus any fiber, SCADA, or protection-and-control pathways routed alongside.
• Mandrel and proof testing on every conduit so the pull path is verified before anyone shows up to pull conductor.
• As-built handoff with depth-of-cover, alignment, and conduit counts documented for the utility and the AHJ.

Schedule certainty, in writing

Because this bore decides energization, we de-risk it on paper before a rig moves. Every interconnection crossing ships with a geotech read, a drilling-fluid and inadvertent-return plan, a monitoring and containment scheme, and a written contingency. The point is simple: the interconnection bore is the one piece of underground scope that can move your COD, so it is the one we plan in the most detail. Pair it with our 34.5kV collection scope and the entire conductor path, from feeder to POI, comes from one crew.