If you are getting notifications from MinimalEnergy, then your Mac is infected with adware. MinimalEnergy is adware for Mac.
MinimalEnergy changes setting in your Mac. First, MinimalEnergy installs a browser extension in your browser. Then, after MinimalEnergy hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.