that have solar cells on the roof of the house
sometimes have big batteries
to store solar energy for when the sun don't shine
and those big batteries can sell excess solar energy
back to the power grid
during those hours of the day when the prices are high
and those big batteries could buy energy from the power grid
during those hours of the day or night
when the energy prices are low
and the big batteries could sell that cheap energy back to the power grid
during those hours of the day
when the prices are high
apartment owners don't have solar cells
but they could have big batteries in the apartment
that buy energy from the power grid
during those hours of the day or night
when the energy prices are low
and the big batteries could sell that energy back to the power grid
during those hours of the day
when the prices are high
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