It seems there is no method for transferring energy in energy_storage, unlike inventory or fluid_storage which have corresponding transfer functions. Additionally, there don‘t appear to be any existing issues addressing this.

I think item/fluid transfer is very different to energy transfer. With items/fluids, there's a lot of interesting automation challenges about making sure the right items are in the right place. As all RF/FE is the same, the only thing you could really do would be smart routing of energy — but that's pretty niche, especially given that most modded worlds generate a surpass of energy anyway!^{[citation needed]}

It's worth noting that a lot this functionality is built with smaller/more-vanilla-esque modpacks in mind (where it competes against vanilla item transfer). In larger packs, where you've got AE2/RS or other powerful pipe mods it's less useful. This becomes more true with RF — if you've got RF that needs transferring, then you've probably already got some form of energy pipes!

The other component of this is balance. CC:T's item/fluid transfer methods allow you to move an effectively unlimited number of items each tick, which is hilariously unbalanced. I'm fine with that though¹, a) you still have to put in some effort to really make it fast, and b) it's a worthwhile trade-off compared with the features it unlocks. With RF, you could very easily write a program to transfer 2B RF/tick, which is a bit broken!