O&M Planner enables the user to run simulations, covering multiple years, to calculate O&M costs wind farm availability and energy production, including uncertainties based on weather input and input failure rates. The tool shows the impact of deploying types/ numbers of transport media such as vessels, helicopters, and others, each with their own weather dependencies and staff on total cost of O&M and lost production due to standstill. O&M Planner is currently developed to also satisfy the future offshore wind use cases, such as (but not limited to:) floating wind farms, wind farm clustering, resource sharing, and hydrogen production.