Interstellar is cool, but pretty complex mod.
USI Warp Drive is pretty cool, but does not allow you to time warp.
Here's the intermediate solution: ISWD standalone - almost the same mechanics as in Interstellar, but in vanilla KSP.
The idea is that EM decays. So you need "Containment Field" to accumulate and store it. To activate containment field you need current power production 100 EC/s. Once activated containment field consu