There are Buildraft engines (redstone [weak], stirling [stronger, requires fuel] and combustion[strongest, requires fuel and water coolant]), biofuel (biofuel reactor turns some biomaterial into liquid biofuel, burnt in a biofuel generator for Buildcraft power) and magmatic engines (turns lava into Buildcraft power).
Batteries have been replaced by Redstone Energy Cells, pump power into those and they'll store it.
Are you using conductive pipes? They're bugged at the moment, and power tends to get "stuck" in them (look for a pipe full of blue stuff). Try breaking them and replacing them. When you've got more resources try redstone conduits. They're not bugged but they're more expensive. Hit the connection between a conduit and something it is connected to with a wrench to change the direction of the blue or orange arrow to control where power flows to/from.
Yeah, calling everything Tekkit X/Y/Z makes it a bit hard to find version specific info in Google.