Matt Allington gives us instructions on how to scale Power BI Premium capacity:
This is the third article in my series about how to make Power BI Premium more affordable for small to medium sized enterprises (SMEs). In my first article I explained the problem and the logic behind how to configure a workable solution. In my second article I provided step by step instructions on how to configure Flow to start/stop Power BI Premium capacities. In the article today I am covering a way to scale the capacity up/down either on demand, or on a timed schedule.
The cloud is generally more expensive than on-prem, though it can potentially become cheaper if you are smart about scaling and have more scaling-friendly workloads. Matt even provides a really cool cost analysis to help you figure out what (if anything) you end up saving using this technique.