But that's just it. Potential energy is just as much energy as electricity is. Energy can be defined as the the capacity for work. Even if you don't like that, you must remember that batteries themselves represent potential energy. So regardless of how, when you store energy for later use it becomes potential.
But, and this is important, people aren't concerned with whether it is theoretically possible to get from one storage into useful energy eventually. What they are concerned with is whether you can take a block of that storage, connect it directly to a power transport system and connect that directly to a machine without any intervening machine to convert the energy from the storage medium into the form that the machine can use.
And no, Buildcraft doesn't have that (unless you could the kinesis pipe loop). Which is fine. The Devs intend the mod to work that way, and don't want to be able to store MJ energy in a way that can be directly transferred to machines. But you sound like a zealot when you try to convince people that there really IS a storage method for MJs.
Personally, I don't like that design for several reasons. First, because not having even static power storage makes any sort of portable power storage completely non-workable. Second, because it makes having a distributed power system more difficult. One of the nice things about having power storage is that you can put a power cell next to outflung elements of your base that aren't used very often and only supply a trickle of power to that cell. Then if you need power for that item, you drain the power cell temporarily and let it build back up over time. Without that storage you need to have enough engines to run that single isolated item connected directly to it. Which means either having a bunch of engines all the way out there, or a massive trunk line to feed it. And third, because having to perform work to convert from non-useful storage into directly useful energy can be problematic. Either if the work requires a jumpstart (like needing energy to convert oil in a refinery), or takes time to spool up (like a boiler needing to heat up to make steam), or is lossy (like leaving engines constantly running connected to a tank of fuel). The Buildcraft team apparently feels that these obstacles make the game more challenging, I just find personally that it gets in the way of what I want to do and frustrates what should be an otherwise fun experience.
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