A pour-day power plan names every load that needs electricity from first light to the last finishing pass, confirms a diesel generator matched to that list the day before, and stages a standby unit in case the primary stops. On a tilt-wall warehouse job, slab and panel casting leave little room to stop once concrete is in the forms. This playbook walks through the day in time-of-day moments so a foreman or superintendent can hand it to the crew.
Lighting is the easiest item to tie to a requirement. OSHA’s illumination standard, 29 CFR 1926.56, says construction areas must be lighted to at least the minimums in its Table D-3 while any work is in progress, and that table lists concrete placement at 3 foot-candles. Early starts and long finishing runs can push work past daylight, so lighting belongs on the list. Equipment varies from job to job, and many pumps, trowels and similar machines run on their own fuel, so confirm each item with the trade that brings it.
Before the pour: build the load list
Power planning starts with a load list, not a generator size. Write down the lighting, small tools, vibrators and finishing equipment that run on electricity, plus the site trailer and any pumps that depend on site power. The construction site generator sizing and load list guide shows how to turn that list into a unit size. Because the fleet runs from 20 kW to 2000 kW, the right answer depends on what your list shows.
Assign one person to confirm the generator the day before. That person checks that the unit is on site or scheduled, that the position is agreed, and that the contact at the rental yard knows the pour date. A written confirmation holds up better than a verbal assumption when the crew arrives before sunrise.
Refuel before the pour, not during it. A tank topped off the afternoon before keeps fuel handling out of the way of concrete trucks and pump lines. The generator fuel consumption chart helps you estimate how long a tank lasts at your expected load. If the pour may run long, an extended-runtime fuel tank can reduce refill stops, subject to your site rules.
Why a pour cannot pause when power fails
Once concrete is placed, the crew is committed to finishing it, and a stalled pour cannot be set aside like most tasks. If lights go out during finishing, the crew loses sight of the surface. If electric vibrators or other tools drop, placement quality is at risk while trucks are still queued. The cost of a site power outage on a commercial schedule page explains how one stoppage can spread across a project. For the schedule effects specific to tilt-wall work, see how late power affects a tilt-wall schedule.
During placement and finishing
The table below organizes the day by moment, with what typically needs power and who owns each action. Treat it as a starting point, because contracts, crew practices and equipment differ between sites. Items that run on their own fuel are noted so they do not land on the generator load list by mistake. Adjust the rows to match your pour.
| Moment | Power to confirm | Action | Owner |
|---|---|---|---|
| Day before | Generator on site or scheduled, standby identified | Confirm unit, position and contact in writing | Superintendent |
| Day before, afternoon | Fuel level | Top off the tank before the pour | Foreman |
| Pre-dawn or early start | Lighting for the placement and finishing zones | Test lights before the first truck arrives | Foreman |
| Placement | Electric vibrators and small tools | Check cords and connections away from truck routes | Crew lead |
| Finishing | Lighting, electric finishing equipment where used | Watch fuel level and lighting as daylight changes | Finishing lead |
| After the pour | Site trailer, lights until crew leaves | Record fuel level and report any issues | Foreman |
Staging the standby and placing the unit
A standby is a second source ready to take the load if the primary stops. Whether that means a second generator, a backup lighting plan or another arrangement depends on your load list, contract and budget, so decide it with your rental provider ahead of time. Staging it the day before avoids a scramble while concrete is in the forms. The power distribution page shows options for routing power from one source to several work areas.
Place the generator outside the paths that concrete trucks and pump lines will use. Set it where a backing driver cannot clip it, and keep cables from crossing the routes trucks take. Leave enough room for refueling without entering the placement zone. Mark the position on the site logistics plan so every driver sees it.
The pre-pour huddle checklist
A short checklist lets the foreman verify the plan at the pre-pour huddle. Each item maps to a moment in the table above. Reading it aloud helps, since a spoken check tends to catch gaps that a glance misses.
- Load list written and reviewed with each trade
- Generator confirmed the day before by the named person
- Standby unit or backup plan identified
- Tank refueled before the pour
- Generator positioned away from truck and pump routes
- Lights tested before the first truck arrives
After the pour
Finishing may end, but the generator still carries lights and the site trailer until the crew leaves. Record the fuel level and any problems so the next pour starts with accurate notes. Tell the rental provider when the unit is no longer needed, following your rental terms. For the panel-lift stage of the job, our page on power for the crane and bracing crew during panel lifts covers the crew’s loads.
Put the plan in writing with Stag
Stag Power Rentals supplies diesel generators from its yard in Dickinson, TX, with a fleet that runs from 20 kW to 2000 kW and billing by single, double or triple shift. Send your load list, pour date and expected shift pattern, and ask for a unit and a standby matched to them. Read more on the construction overview page, then use the quote form to start the request. Sending those details before the day-before confirmation keeps the plan from forming around a gap.
Frequently Asked Questions
What should a pour-day power plan include?
It should list every load that needs electricity, such as lighting, small tools, vibrators and the site trailer. It should name the generator, the standby, and the person who confirms them the day before. It should also cover refueling and where the unit is positioned. Contract terms and site rules may add requirements.
Do all pour-day tools run on a generator?
No, equipment varies by crew and by site. Many pumps, trowels and similar machines run on their own fuel, while others use electricity. Ask each trade what its equipment needs before the load list is final. Only electric items belong on the generator list.
Who confirms the generator the day before the pour?
One named person should own the confirmation, usually the superintendent or foreman. That person verifies the unit, the position, the fuel and the contact at the rental yard. Putting the confirmation in writing leaves a record if something changes. The exact role depends on how your team divides duties.
Why refuel before the pour instead of during it?
Refueling during placement puts fuel handling near trucks, pump lines and a committed crew. A tank filled ahead of time removes that interruption. It also gives the crew a known starting level to watch through the day. For longer pours, an extended-runtime tank may reduce refill stops.
Where should the generator go on a tilt-wall pour day?
Place it away from the routes that concrete trucks and pump lines will use. Keep cables out of truck paths and leave room to refuel without entering the placement zone. Mark the position on the logistics plan so drivers know where it sits. Final placement depends on the site layout and the superintendent’s plan.