You will need a licence to download and use Power BI. The price of Power BI will determine the cost. There are 3 different options for licencing depending on what you intend to use Power BI for and how many users you would like to have access, Free, Pro and Premium.
Power BI Desktop is available as a free version of Power Bi which allows you to use Power Bi but with some limitations to the features. However, there are still some really useful functionalities to the free version including being able to import data from over 70 different data sources. You have access to the same filters and visualisation tools and can export your reports to excel, PowerPoint or PDF. You can publish your reports to the web and have a storage limit of 10gb.
Power BI Pro gives you everything the free desktop version provides with data sources and visualisations when creating reports. However, with Pro you get more autonomy in creating and building dashboards and reports. You also have access to the mobile version of the app and can embed your Power BI visuals into different Microsoft apps such as SharePoint, Teams and Power Apps. You will receive 8 daily data refreshes with a Pro licence.
With Pro you will receive a higher level of data security and encryption, and you will also have much more options when it comes to sharing your reports and data with other users.
Power BI Pro is licenced per user, at the cost of £7.50 per month.
Power BI Premium is the most advanced version of Power BI, and is designed to help larger organisations and businesses.
Because of the design and extra features, Premium is the most expensive option and is also available as a cost-per-licence product. The Premium version of Power BI can also be purchased on a per-capacity basis. With a Premium licence, you have 100gb of storage, access to API surface, the ability to analyse Azure data lake storage and application lifecycle management. You will also have access to advanced AI features and 48 daily data refreshes.