Negative prices happen all the time, prices in ACER (Europes power market) are calculated on a 15 minute cycle (used to be 1hour) and your provider will be charging you negative prices if the electricity price is so low it overcomes the network fees. I've seen this exact thing happen on my own power bill.
EDIT: after reading the rest of the comments OP added that these prices include their 20 cents/kwh fee.
One thing to note, these spot prices are the price before any fees, your network fees and all that are per kWh and usually more than the negative sum the electricity price goes to.
(probably in this case though -38 cents is a lot)
Negative prices usually only truly exist for enterprise customers that pay 1/5 of the consumer network fees.
They probably weren't dark. If they go dark and want to actually not be tracked people do turn off their phones.
And while I dunno about Dutch ships, from talking to people who have served on Norwegian ships, they do in fact go around with detectors to verify that the ship is actually dark when they go dark and you do get severely punished if you didn't turn your phone off.
Interesting that the source for this disagrees with the Norwegian statistics bureau of which they got the data from.
If should be the UK for Norway, not Germany. It has traditionally been Germany but post-brexit and the Ukraine war has made UK buy a lot more gas from Norway, overtaking Germany in trade volume very ever so slightly (like 0.1% difference)
This is what made a lot of people I know stop using Spotify for podcasts.
My coworker told me they were listening to a podcast, and while the podcasts host were mid ad read for their sponsor, Spotify put an ad in.
So he got an ad during an ad.
My -10.5 says a lot huh