Hmm... for example, the scheme of solar or tidal energy to move water uphill, then grab hydroelectricity? is an example of storing gravity? is that a valid char

Hmm... for example, the scheme of solar or tidal energy to move water uphill, then grab hydroelectricity? is an example of storing gravity? is that a valid characterization? And yes, you immediately got the worry; that accessing gravity would at scale over a few hundred years, be a danger.