In this randomized controlled trial, 169 persons with multiple sclerosis were randomly assigned to an immediate intervention group or a delayed control group using a crossover design. The outcome measures (Fatigue Impact Scale and SF-36 Health Survey) were measured four times before and after courses. This study investigated whether the immediate benefits of a 6-week, community-based, energy conservation course for persons with multiple sclerosis were maintained at 1-year follow-up. We performed intent-to-treat and compliers-only analyses using mixed effects analysis of variance models. Results showed that the beneficial effects were maintained 1-year postcourse compared with immediate postcourse. In addition, there were significant improvements in all three subscales of the Fatigue Impact Scale and in four subscales of SF-36 Health Survey 1-year postcourse compared with precourse. Together, these results provide strong evidence that the beneficial effects of the energy conservation course taught by occupational therapists were maintained up to 1-year postcourse.