Peat is a fuel source added by forestry:
http://forestry.sengir.net/wiki/index.php?n=Category.PeatProduction
You can make bog earth in a carpenter and put it near water (1 block any direction) and it will mature into peat you can harvest by hand. A peat farm automates this for you.
If this is your first time playing forestry it can be a little overwhelming, but the peat and wheat farm will compliment each other if you convert some of your wheat into mulch using the moistener. You can use a macerator/pulverizer to convert coble to sand to fully automate the peat production.
http://forestry.sengir.net/wiki/index.php?n=Category.PeatProduction
You can make bog earth in a carpenter and put it near water (1 block any direction) and it will mature into peat you can harvest by hand. A peat farm automates this for you.
If this is your first time playing forestry it can be a little overwhelming, but the peat and wheat farm will compliment each other if you convert some of your wheat into mulch using the moistener. You can use a macerator/pulverizer to convert coble to sand to fully automate the peat production.