The study focused on the crucial role of effective planning in ensuring project performance within different institutions. Specifically examining AEE Projects in Rwanda, the research aimed to understand the correlation between project planning practices and project performance. It investigated the impact of project scheduling, financial planning, risk planning, and resource planning on project outcomes. Data was collected through questionnaires, interviews, and documentary reviews from the staff of seven AEE projects, with a sample size of 118. Both quantitative and qualitative analyses, including correlation, regression, and variance analyses, were conducted using tools like Excel and SPSS. The results indicated a strong positive relationship between the independent variables (project scheduling, financial planning, risk planning, and resource planning) and the dependent variable (project performance). Notably, considering anticipated risks during project planning showed a high correlation of 0.945 with project performance. The study concluded with recommendations, including the involvement of experts in financial planning, engaging project stakeholders in risk planning, and conducting a skills gap assessment in project planning within organizations, followed by relevant capacity-building sessions.