Daily Life at Hogwarts Chapter 49: A war without a winner (49)
"It is not difficult to use solar and wind energy to generate electricity..."
At the entrance of the tent, Hermione pointed to the light on the table and said to Albert, who was flipping through the newspaper at the table, "But using these two methods to generate electricity is not stable enough."
"You need to prepare batteries. Battery storage has always been a big problem."
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