Board Thread:Questions and Answers/@comment-72.92.58.121-20130107111948/@comment-192.31.106.36-20130107140615

Based on that, here's what I have as far as power conversion between the three different systems. RedPower seems to be the odd one out here.

MJ - BuildCraft Blulectricity - RedPower EU - Industrial Craft

EU -> MJ - Electrical Engine (four varieties) MJ -> EU - Pneumatic Generator (four varieties) Blulectricity -> MJ - Blulectric Engine

MJ -> Blulectricity - Unknown EU -> Blulectricity - Unknown