At this time, Microsoft does not currently maintain a version of Power BI that will function on macOS. If you only have access to a Mac computer, potential solutions include installing a virtual machine, using Boot Camp, or remotely connecting to Windows computer.
Before pursuing any of these options, we recommend that you consult with a member of your information technology team to ensure that you are following your organization's policies.
Virtualization tools such as Parallels, VMware Fusion, and Virtual Box allow you to install Windows in a contained environment.
Boot Camp Assistant is a tool that can be used to create a separate partition on your hard drive for Windows. Please refer to Apple's Boot Camp Article for how to use this tool.
Your organization may have Windows computers or Virtual Windows machines that you can connect to remotely from your Mac computer. This is typically done with a tool such as Remote Desktop Client.