I spent over a decade working in the energy industry, focusing on electric and gas utilities. These utilities have some key similarities and some differences – they both have transmission (pipelines and overhead transmission lines) and distribution (local lines into your home), as well as customer service (local trucks, service, and billing). Gas companies don’t have “generation” in terms of power plants, but they do have drilling and gathering (within the US) or entry through a liquefied natural gas (LNG) port from a third countries, then into a pipeline.
Gas can be stored under pressure; in the summer gas companies historically injected gas under pressure into the ground, which they then pulled out of storage in the winter when gas demand “peaks”. In the summer, gas prices are at their lowest (maybe $2-$4 / unit) and then they are at their highest in the winter ($8 – $10 / unit). In the olden days (when I worked in the early 90’s) gas wasn’t “marked to market” every day; the gas company was either short or long gas on a given day, and then they trued-up with their suppliers periodically. In my audit I pointed out that the local utility had been “shorted” gas by their suppliers in the winter (when prices were high) and their suppliers made it up in the summer (when prices were low) – by this I pointed out that the local utility was losing hundreds of thousands / year by trading the same commodity in this unfavorable manner (even though the # of units were the same).
Electricity isn’t as widely traded as a commodity because it can’t be stored (at least not effectively). Thus its price can range from negative (it can be more expensive to restart a giant plant than to run it and sell the electricity at a loss) to almost an infinite price if it is a hot day and the transmission lines are overloaded so that only local generation can satisfy the demand. The price would need to be determined by location (city) and then by time; thus electricity can be cheap in one location or overnight and then by sky-high at a neighboring city during 1pm during the heat of the day.
Another element that electricity and gas have in common are “classes of service” – they include residents, government (street lighting), small businesses, and large businesses. Each of these utilities have chronic and continuing arguments to determine how to spread the burden ACROSS these classes of customers; government usually pays the least, but then it goes backwards from large businesses to small businesses and then residents, on a per/unit basis. There are convincing arguments for each class; the big business customers put almost no demand on distribution and customer service but put a huge burden on generation (unless they have their own generation); while individual customers go the other way. The “joke” in the industry was that you could raise rates as long as you didn’t raise them for their rate class (I never said utility people were particular funny).
The point of this isn’t really gas or electricity; it is water. Water is relatively similar to a gas utility with a transmission and distribution network. Water doesn’t have generation but is gathered through wells or collection (dams).