You’ve put this question under the Blynk 2.0 category, so I assume that you are using the new Blynk IoT (Blynk 2.0) platform?
Blynk IoT doesn’t use Energy, instead it has three subscription levels that provide different levels of functionality…
If the Blynk 2.0 category was a mistake and you are still using the original version of Blynk (now known as Blynk Legacy) then purchasing additional energy has been stopped because the product will be retired on 31st December this year, when the Blynk Legacy cloud servers will be switched off and all projects that use Blynk Legacy will stop working.
What EXACTLY is it that you are trying to achieve?
Pete.