Yes, it could be possible, but the article linked to says, NO.

It says that Boogle has made contracts with energy suppliers of renewable energy for their electricity. Since that is mostly solar, and some wind; and no hydro-dynamic storage (see my post) or hot salt baths... then there is very little actual renewable energy at night. So, they are buying energy that is actually produced during the day, and shipped to someone else, and then actually getting energy at night from coal fired power plants.

Its like someone with a line-tie solar panels saying they are off-grid. They are not. They are just an small energy producer and if the grid goes down, they are too. Its a technical detail when everything is hunky-dory, but it means everything to the planet.