I agree with shakeyjake. I have decades of experience as residential and light industrial electrician. If the utility doesnt figure it out, they will tell you to call a pro electrician. Shakey knows what he is talking about. And that is what you should do.
Even with lots of experience, there a few obvious things I would check but beyond that I need the company van with the special equipment to go any further.

Make sure that in the sub panel of your garage that the neutral and ground buss’ are not connected together (grounds and neutrals should be separated in the sub panel) The Neutral and grounds should only be connected at the first service disconnect which is the main panel at your house where your service enters. The Neutral provides the return path back to your main panel. IF neutral and ground are connected together in sub panels it allows the return path to be divided between Neutral and ground which is a shock hazard, in effective breaker operation, and can cause noise interference issues (your frig/radio in garage).

Get a qualified electrician. Stay clear until they have corrected the problem. This can and has been many times a deadly situation.

Thanks guys I have an electrician coming Friday and will call Xcel Energy again in the morning as they weren’t very helpful tonight.

Call them right now, there’s a guy sitting at home on call waiting for his phone to ring. He gave up his week to be able to respond. I hate it when a call comes in on straight time when the problem started the night before. Customer didn’t realize it was free or says “I didn’t want to bother anyone after hours”.….lol

Jake you sound just like the linemen here just waiting for that time and a half.

I called and talked to someone and they sent me to building and they were closed so unless you have a hot downed wire or a gas leak they don’t have any number to call.

Time and a half? Nope, Double bubble man! That’s what pays for my gear…lol

Ha.

I know quite a bit of everything related to the trades. Call an electrician. Dont be penny wise. This is a very dangerous situation

They should send a guy out if you leave a description, or call the number. Tell them an electrician was here already and says it on their side. We get calls for “flickering” lights when it’s just the cheap LEDs, tree on line or a line down that winds up to be a communication line etc. We have to send someone to check just in case it is on a HV line, not good for PR if a kid tries to push it off…haha.

Like I said. You need a pro and it's money well spent, but I suspect the issue lies with whatever electrical passes by the pool or supplies the pool with electrical equipment. You have a pump house I assume. It's going to be whatever electrical was installed when you installed your pool

Could be a light in the pool, the pump ( most likely). My guess it's a piece of equipment that has water plumbed through it

If you can get the electrician out that did the work on your pool, he will probably have an idea what the issue is, if he hasn't retired already.

This is the same condition, that crops up on farms. usually referred to as tingle voltage. The cattle will refuse to drink , from a heated water bowl, or get shocks from metal stabling. I went to a complaint of a water bowl giving shocks. Examined all the connections and grounding. In all the panels in all the barns, house . The flow would vary from time to time. Hydro crew came in and did the same , checks . They later found an open neutral connection at a pole 2 miles away. after closing the connection . The problem was eliminated. Power will return to the source , by the best path. Can be returning , through the neutral. or through the grounding system , the earth to another better source. maybe a neibouring farm or dwelling. I spent 36 years as an electrician and a hydro lineman,in a utility, in my former life. You run into a lot of weird problems .

Have your electrician , go over all your panels, and all ground rod connections. If you don't find it at your place, Your utility may find it in the neibourhood. Good luck, finding the problem, may be frustrating. old243

He is correct when he says to keep the ground wire and the neutral separated until they reach the main panel. The reason is it is potentially dangerous to the technician working on the equipment.

When I disconnect a bonding wire from a panel, the assumption is that bonding wire is now isolated from the electrical system. That assumption will kill me if there is a short circuit that has found a path to to this bonding wire that should be isolated. And this is why I turn the power off at the main panel, no matter what, every time. Hackers are dangerous and I don't know who wired the house I'm working on, or who touched it after.

The same principal applies to circuits that share a neutral. The breakers need to be joined so that all circuits using the neutral shut off together. Usually a duplex breaker with a bar joining the two switches. This is a very common mistake in wiring and I see it on new construction regularly.

Say you shut off a circuit. Your meter says no power. You think it's safe. Then you take the wire nut off the neutrals and see a spark, or you are unfortunate enough to be caught between the feeder and the home run. You just got electrocuted. That is because residual power is coming back to the panel on the neutral. A circuit is using that neutral, but it's not the circuit you checked.

No idea if is a frog story or fact. When running line for my LP tank had to make a cut out for the main line through the concrete or they wouldn't hook it up. Said concrete would eat through the copper line.

Sparkys.......
The Doctors of construction........................................................

Bad neutral

There is only one bar in sub panel to connect ground and neutral wires but they are not connected to the same screw if that’s what you’re asking.

That opens up a can of worms…lol. You said SUB panel, not the one right before the meter? Does the panel have its own ground plate/rod. If not, the bond screw/strap needs to be removed from the buss that they’re connected at.