How to stop macOS 26 from waking my system up every hour?

What is the concern here? Intel Macs had a Power Nap feature for running background activities when connected to AC power, and it could be disabled. Apple Silicon Macs always 'Power Nap' and you cannot turn it off.

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Regarding the specific process that you've identified, based on the information from Owl-53 you can try Calendar app > Calendar menu > Settings > Alerts and uncheck the Time to Leave option.

Don't put your Mac to sleep is probably the easiest way on not having the OS wake up every hour. I believe the last time I ever used that function is when I had a HardDrive in my Mac but quit using it when Apple started using SSD's. There are no spinning platters anymore.

OP wrote " scheduledby = "com.apple.alarm.user-invisible-com.apple.calaccessd.travelEngine.periodicRefreshTimer"; "

This entry means that the system calendar daemon (calaccessd) scheduled a periodic refresh of travel-related calendar data (e.g., to update estimated travel times or notifications about when to leave for an event).

Totally normal.

This is a routine background operation performed by Apple’s Calendar subsystem. It’s not malware or an error — just part of how macOS keeps calendar information up to date

To be construction as mandated by the Apple Support Communities Use Agreement

B. Submission article 3 " Post constructive comments and questions. Unless otherwise noted, your Submission should either be a technical support question or a technical support answer. . . . "

If the user believes these current issues stem specifically from macOS 26 Tahoe 26.1

For a thorough test to determine if Tahoe is the root cause of all computer issues.

Use the “Atomic” option and select “Erase All Content and Settings.” Apple Silicon computer

Apple Intel computers >>   Use Disk Utility to erase an Intel-based Mac followed by How to reinstall macOS

Always make a Time Machine backup before proceeding.

This will not affect the existing installation of Tahoe.

Run the computer without installing any additional software and without restoring from your Time Machine backups.

Run the computer in this mode for approximately 6 to 8 hours and report back if the previous issue reoccur.

Contact - Official Apple Support

Then, if your not pleased with the work of we volunteers

Try your hand at an AI / LLM Model - proceed with Caution, I dare say

Copy and past your question and body of your question into the Ai/LMM

I know I have done this on your question and some of the information was most interesting

Weird how I now have 3 replies from 3 different people in a support community, and none of them are actually trying to answer my question, which was: how do I get rid of all this?

Has it then not dawned on you that you probably can’t. You should contact Apple Support.

creoairer44 wrote:

Has it not dawned on you that I have already contacted them?

I asked a simple question: how do I remove this? Several replies later, still no answer, just deflections and now even deleted posts.

If the answer is “you can't”, why not say it clearly instead of hiding behind “contact support”? This looks more like damage control than community support.

Now, if you can't, the next logical question is: why not?! Why does TravelEngine set recurring wake alarms when it should be silent, since the associated function disabled? Or is it that it has some hidden functions too?!

The answer to all of your questions is nobody here knows how it works. You need to talk to Apple to find out how to fix your problem. I’m sure there’s many times mine wakes up to do maintenance and I don’t care.

since we didn’t write the software and we have no connection to Apple whatsoever, all we can do is guess at ways to stop it. Obviously everything people have suggested does not stop it so the logical conclusion is there’s no way to stop it.