Getting high quality data about an electricity grid is extremely expensive and difficult. A big part of that in the U.K. is driven by the fact that most of our distribution networks are underground, which means that a lot of equipment is located below ground level.
This gives you one big problem, the place where you want to install your fancy new sensors are all located in places that most telecom systems don’t/can’t serve (4G doesn’t work very well in a hole). Plus to make your life even harder, power distribution equipment puts of plenty of EM interference, making radio comms even harder. So you can put the hardware in, you just can’t communicate with it. Making it kinda useless.
Obviously there are plenty of place were this isn’t true, but they’re in the minority. End result is that lots of fancy equipment doesn’t get deployed.