That's £17M of electricity, not including all the equipment, staff, installation costs etc.
To put this in perspective, Sadiq Khan already runs the system at a massive loss. They just about cover their operating costs at the momemt, and rely entirely on grants from the rest of the country to do upgrades of any kind. So cooling efforts have to be very cost efficient. Also the UK grid is very supply constrained. New nukes are being built but there have been the expected massive cost overruns and problems, so any large new energy demands in the UK just aren't happening anytime soon. It's actually been deindustrializing due to very high electricity costs.
To put this in perspective, Sadiq Khan already runs the system at a massive loss. They just about cover their operating costs at the momemt, and rely entirely on grants from the rest of the country to do upgrades of any kind. So cooling efforts have to be very cost efficient. Also the UK grid is very supply constrained. New nukes are being built but there have been the expected massive cost overruns and problems, so any large new energy demands in the UK just aren't happening anytime soon. It's actually been deindustrializing due to very high electricity costs.