[EandM]

This was a customer's place yesterday in Charmouth.
The first electric roof I've seen that wasn't attached to a car.

They made it themselves as glazing is their thing.

Clever stuff!

[High-Tower]

Some of the velux windows are electric, they even have rain sensors to close automatically.

[Bungle]

Some of the velux windows are electric, they even have rain sensors to close automatically.

Some sun canopies are electric and open on their own when it gets hot. As I found out years ago when I was trading a bedroom window above one  a sharp descent back down before I got knocked off.

[dd]

They do not look easy to clean

[EandM]

Some of the velux windows are electric, they even have rain sensors to close automatically.

Yes, I've seen a few of those.

This is about 10 feet by 6 feet though and must weigh a ton.

I should have put something in the picture to give an idea of scale.

At least it gives easy access to the roof.

[EandM]

They do not look easy to clean

Access is easy once you open the roof. Just put a ladder up from the mezzanine floor/room below.

You can stand in the gulley at the back or reach across from the right hand side.

The whole Roof is probably 20 x 20 feet and then there are additional 6x6 feet skylights.

[SB Cleaning]

They do not look easy to clean

Your right looks ball ache to me .