Not could, will. These days it’s considered unethical not to debrief explaining any deceptive elements of the study. It can also be valuable because the people conducting the study can use it as a chance to find out if the participants knew about the deception, in case that knowledge might have affected the results.
Nobody wants energy stored for months. Whatever storage is used needs to get through temporary decreases in efficiency. In places that use solar, that means from one afternoon to the next morning. In places that use wind, it means until the wind picks up. We’re talking storage on the order of tens of hours at the most.