My prices went down in the last two years by almost half. I could get a time based tariff and sometimes buy electricity at negative prices. Of course I have like 400 different electricity providers I can choose from... Monopolies are... not great.

It depends and varies wildly based on your area and how the electricity is actually sold.
If they are using an energy stock exchange, as many places are, then increased capacity, especially increased renewable capacity, greatly reduces the price per kWh because the price depends on the most expensive method of generation.
And because renewables always offer their electricity for free to the exchange, as they don't have any fuel etc costs, you sometimes end up in the peculiar situation like here in Finland (and in the entire NordPool area) tomorrow between 13:00 and 16:00, where electricity is literally priced at 0€/MWh, as there is enough renewables to cover it all.

Ideally anyway. Government interference can always screw it up and create barriers to competition.

Where I live (Ontario, Canada) on-peak electricity prices have pretty much exactly kept pace with inflation over the past 20 years, so in effect electricity costs have not gone up.

Off-peak prices have crept up more than that but solar power doesn’t help with off-peak generation at all. Wind turbines do produce more at night but we’ve had government subsidies to encourage building wind power capacity and those subsidies result in higher wholesale prices for that power (actually above the off-peak prices consumers pay).