Energy Gates, no one really wants to open them due to the fact that it spends a non-rechargeable energy source.
This brings up the problem of people begging for people opening gates and ends up one person losing out or being outright ignored. I either suggest lowering the cost to 1 or 2 Energy per gate which allows for the Energy Cost to remain even while still allowing many more gates.
However, you could also bring in an old mechanic you used to do with Silver Keys. Except, rename them to something like... "Energy Key". (Simple name, sue me)
It'd have the same function as the Silver Key used to, they'd appear randomly within the level that feature an Energy Gate, and your goal would be to find it and carry it to said location. Boosting Arcade's popularity.
Only as a box drop. A rare box drop. As rare as SoLs please.