In the UK specifically, piped gas and electricity are effectively transported 'free'. Ie. economically it is a single market with a single price. Regulations require all market participants are treated equally, and delivery is done by the government at a fixed price, no matter how far away you are, and if for some reason they cannot deliver (for example capacity/transport constraints), then you will be compensated.

Thats why specifically the UK is a good case study for a 'perfect futures market', because many of the real world market distortions don't exist.