I never use HV Solars nor Advanced Solars(Too OP). In fact, even Compressed Solars are a bit iffy.With RF, you actually have to pay for it. With IC2, when you have enough materials, players would just plop down an HV solar and forget about it. No point in making any more power production at that point. It's also relatively easy to look up a reactor design oonline and get plutonium to make infinite power without the high resource cost. That way only requires more uranium at that point. With RF, you actually need fuel no matter what dynamo you use. All of the fuel types supported by TE (excpet the reactant dynamo - that one's special) are supported by IC2. As your power draw gets larger, you need more dynamos, and as a result, more fuel.
As for Fuel Cost, let's hope the Fuels in question include Charcoal and Lava. Still would be nice to have energy loss over distance though.
(Off Topic: Did you know that the Current IC2 Experimental E-net system is unfinished and currently has no EU loss?)
Edit: I may actually try Mekanism and see if it does replace IC2 in my favour.
I'm mainly in IC2 for Jetpack, Rechargeable Tools/Armour and UU-Matter Stuffs.