Redstone Energy Conduits aren't better than BuildCraft Pipes in every regard, at least in the current MindCrack incarnation (BC 3.3.0 and TE 2.1.6).
From the TE Wiki: "There is energy loss, it is not distance based; suffice it to say that these are indeed an improvement over conductive pipes." <-- This is not always correct.
Test case:
1 Combustion Engine with 1 Bucket of Biofuel (and sufficient water to cool it) feeding into:
a) Redstone Energy Cell (short: REC) directly
b) Wooden Conductive Pipe -> Golden Conductive Pipe -> REC
c) Redstone Energy Conduit -> Redstone Energy Conduit ->REC
The REC has in the end the following contents:
a) 204800 MJ
b) 200882 MJ
c) 194558 MJ
The two conduits don't buffer 6k MJ, so they have the biggest loss of all the solutions.
Just as a heads up, that it isn't necessary to trash all your conductive pipes once you got to the conduit-stage.
From the TE Wiki: "There is energy loss, it is not distance based; suffice it to say that these are indeed an improvement over conductive pipes." <-- This is not always correct.
Test case:
1 Combustion Engine with 1 Bucket of Biofuel (and sufficient water to cool it) feeding into:
a) Redstone Energy Cell (short: REC) directly
b) Wooden Conductive Pipe -> Golden Conductive Pipe -> REC
c) Redstone Energy Conduit -> Redstone Energy Conduit ->REC
The REC has in the end the following contents:
a) 204800 MJ
b) 200882 MJ
c) 194558 MJ
The two conduits don't buffer 6k MJ, so they have the biggest loss of all the solutions.
Just as a heads up, that it isn't necessary to trash all your conductive pipes once you got to the conduit-stage.