In 1990, Power played for the Pittsburgh Pirates and pitched innings in 40 games and went 1–3. In the 1990 National League Championship Series, Power made the only postseason appearances of his career. He appeared as a reliever in two games and he started the sixth game as part of an attempt to defeat the Reds' platoon system. When the Pirates announced that Power would start the game, the Reds started their left-handed-hitting platoon. After the right-handed Power pitched three innings, Pittsburgh manager Jim Leyland brought in left-handed starter Zane Smith to have more favorable matchups against the left-handed Reds lineup. Power and Smith each gave up only one run, but the team lost the game 2-1.