Berkshire Hathaway (BRK.B -0.01%) made lots of waves in the energy sector last year. This past year it spent $10 billion to acquire NV Energy as well as buy shares in Exxommobil (XOM 0.39%)Suncor (SU 0.18%), and National Oilwell Varco (NOV 1.45%). Apparently, though, that wasn't enough for the Oracle of Omaha, because Berkshire just recently announced it would be buying Phillips Specialty Products, a division of Phillips 66 (PSX 1.14%), for about $1.4 billion.

Of course, Warren Buffett doesn't buy just any company, he buys great companies. Just look at Suncor. At the time, Canadian oil sands companies were selling their product at a steep discount to American benchmark prices and also struggling to ramp up production. If you looked at Suncor, though, 91% of its production was selling at global benchmark prices and was on track to triple production by the end of the decade. That's when Warren pounced and gobbled up 18 million shares.

These kinds of moves are what separate Warren Buffet from the rest of us, and it isn't the only move he's made in the energy space. In the slideshow below, we go over all of Berkshire Hathaway's energy investments and why they fit the Warren Buffet style of investing.