For a more.. to-earth approach, I'd suggest Steve's Carts treefarms. I use 2 "E" shaped treefarms for my boilers - and currently am heating up my 3rd 36HP boiler. It took me a while to figure out how-to, but in short, this is what I've done (using RP2 and Factorization).Using the steam boilers isn't really the issue, overall. It's fueling them that I can't get past. Biofuel is out because I don't have the know-how to automate it. Oil is extremely micro-managey unless you have a massive oil/fuel tank good enough to keep your boilers running for... weeks, at least, and creosote oil is, well... creosote oil.
Lava would be the only reasonable option since that's more renewable than anything else. One Mystcraft age could infinitely supply lava forever. And ever.
Actually, I just had a thought. Doesn't oil spawn most commonly in desert biomes? If so, couldn't I just make a Mystcraft Desert biome age and just collect oil I find there into a large tank?
The Cartfarms send their stuff to my barrels (apple, sapling, wood) where an item tesseract sends them to my boilers. There, two sawmills produce logs out of the wood, feeding those directly into the boilers. I'm using relays as buffer system, one at the wood-barrel and two at each of the two sawmills (per boiler). Granted, you cannot heat up more than 1 boiler at a time - but once the first one was heated up, I had no more energy problems MJ-wise. Goal for this are 6 HP boilers (probably have to add one or two more tree farms *). To not waste anything, the sawmills send their sawdust though another item tesseract, which feeds a Xycraft Fabricator, turning the dust into compressed sawdust, which then gets turned into charcoal in a powered furnace. The part I like about this whole setup is basically the tesseracts, as they allow me to build my boilers, treefarms, charcoalproduction how and where ever I like. No pipes are harmed during the whole process, except the first few pneumatic tubes to the barrels. Though the next treefarms I add will probably end up with yet another item-tesseract and have that feed the barrel at my house.
This sounds way more complicated written out. So, supershort describtion: Steve Carts Treefarm > Barrel >[Tesseract]> Sawmill >[Optional:Tesseract>Charcoal] > Boiler.
[edit]
* Which in turn prolly will mean I'll scrap the two old farms and build me a stable flat forest mystcraft age again utilizing the tesseracts and regain lotsa space next to my house.