Brentwood, CA · November 2021 – January 2022 · LADWP / LADBS

Brentwood: permission to operate is not the same as operating.

The notice arrives, it says congratulations, and people reasonably assume that is the end of it. On this roof nothing was generating.

Written by the Cali Energy project team · California contractor license 1032379 · Updated September 2026

Permission to operate is the utility agreeing that a system may run. It is not the system running. Somebody still has to switch it on in the correct order, confirm it is exporting rather than merely powered, and check that the monitoring reports what the roof is doing. That visit is a separate job with its own date. On this Brentwood project the final passed on 4 January, the permission to operate followed, and Cali Energy commissioned the system the week after.

At a glance

Final inspection

Passed 4 January

Permission to operate

Granted

Commissioning

A separate visit with its own date

Gap between them

Eight days

Utility / AHJ

LADWP / LADBS

The story

The first question on this project came before there was a project. Not a system size, not a budget — whether this roof could carry an array at all. That is the right order, and it is rarer than it should be: a feasibility look before a proposal exists costs nothing and stops a design being drawn for a roof that will not take it.

The roof took it. The array went up in the week before Christmas, the final moved once over the holidays and passed on the fourth of January, and the permission to operate came through.

Eight days after that the system was started. Between those two dates it stood finished and switched off, which is where the confusion on this kind of project lives.

Here is the distinction that catches people, and it catches them because the paperwork is worded to be reassuring.

Permission to operate is the utility saying yes. It means the interconnection is approved, the meter is right, and the system is allowed to run and to export. It arrives as a notice that opens with congratulations, and every reasonable person reads it as the finish line.

Commissioning is a different thing entirely. It is somebody physically at the property: switching the system on in the correct order, watching the inverter come up, confirming that power is actually flowing out rather than the equipment merely being energized, and checking that the monitoring reports what the roof is doing. It takes under an hour and it is a scheduled visit like any other.

The two are easy to conflate because only one of them arrives in the post. Permission to operate is a document. Commissioning is a visit. A system that has the document and not yet the visit looks identical from the street to one that is running, produces nothing and sets off no alarm anywhere — the utility does not monitor whether a customer chose to generate, and the household has a notice saying congratulations.

What the gap costs is straightforward: every day of it is a day of buying electricity you already own the means to make. That is the whole reason the visit is booked rather than assumed.

So the thing to do when your permission to operate arrives is not to file it. It is to ask one question: has the system been commissioned, and by whom, and on what date. If the answer is vague, the system may well be sitting there switched off.

And there is a simple check anybody can make. On a clear afternoon, open the monitoring. If it shows nothing at all — not low production, but nothing — the question is not about the roof. It is about whether anybody ever turned it on.

Cali Energy installed, finaled and commissioned this array in Brentwood, Los Angeles.

How it ran

Eight days between a permission that said congratulations and the visit that started the system.

What we did

• Assessed the roof before any design was drawn for it.
• Carried the array through a final inspection rescheduled once over the holidays.
• Treated commissioning as a visit with a date rather than an assumption.
• Commissioned the system and confirmed it was generating.

System specifications

Is your project like this one?

• Your permission to operate arrived and you are not sure the system is on.
• Your monitoring shows nothing at all rather than low production.
• Your bill has not changed since the array went up.
• Nobody has told you the date your system was commissioned.

Cali Energy in Brentwood

Frequently asked questions

Does permission to operate mean my solar is running?

No. It means the utility has approved the interconnection and will allow the system to run and export. Whether it is actually running depends on somebody switching it on and confirming it generates. The notice reads like a finish line, which is precisely why the gap is so easy to miss.

What is commissioning on a solar installation?

A visit to the property to bring the system into service: switching on in the correct order, watching the inverter come up, confirming power is flowing out rather than the equipment merely being energized, and checking the monitoring reports what the roof is doing. It takes under an hour and it is a scheduled job like any other.

How would I know my system was never switched on?

Open the monitoring on a clear afternoon. Nothing at all — not low output, but nothing — points at a system that was never started rather than one performing poorly. The other sign is a bill that has not moved since the array went up.

What should I ask when my permission to operate arrives?

Ask whether the system has been commissioned, by whom, and on what date. A vague answer is the warning. Every day between permission and commissioning is a day of buying electricity the house already has the means to make.

Does Cali Energy install solar in Brentwood, Los Angeles?

Yes. Brentwood projects are permitted through LADBS and interconnected through LADWP. Houses here are large enough that an idle system can go unnoticed for weeks, which is why the commissioning visit is treated as a step with a date rather than something that happens on its own.

What this would look like on your roof

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This timeline reflects this property and this permitting path. Updated September 2026.