Energy stocks have once again caught the attention of investors following The International Energy Agency's recent upward revision of the oil demand outlook. The favorable commodity pricing environment is supporting upstream operations, while downstream firms are enjoying steady cash flows. These conditions create opportunities for Energy Transfer LP (ET) , Transportadora de Gas del Sur SA (TGS) , and Helmerich & Payne Inc. (HP) to witness gains.Favorable Energy BusinessWith West Texas Intermediate crude su ...