In this edition, energy analysts Joel South and Taylor Muckerman continue their discussion on the top stocks in the energy sector in 2012. In the sixth spot, they slated West Coast refiner Tesoro (NYSE:TSO).

Tesoro can pinpoint three developments which helped the company boost its share price by 80% this year. The first and most important aspect of Tesoro's success is the advantageous crude feedstock available to all seven of the company's refineries. The next two areas focus on Tesoro's increased cash flow. The company has reinvested excess cash into high-return projects, which should help build long-term competitive advantages. In addition to organically growing the company, it also enabled Tesoro to return cash to shareholders, increasing on the 80% capital gains return in 2012.

Joel South has no positions in the stocks mentioned above. The Motley Fool has no positions in the stocks mentioned above. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.