The claim:

Japan has activated its first megawatt-scale underwater turbine, the AR1100, to harness the power of ocean currents for clean energy. Anchored to the seabed and spinning silently in the ocean flow in the Naru Strait between the Goto Islands in Nagasaki Prefecture, this 1.1-megawatt machine is now generating electricity from the relentless force of the sea. That’s enough to power over 1,000 homes. It’s Japan’s first grid-connected tidal energy system, and it’s a big deal.

No, it’s not a big deal.  In particular, it’s probably fake news.

The problem with ocean current energy, or hydrokinetics more generally, isn’t that it’s theoretically impossible, but rather that it no longer has the potential to compete economically with solar and wind.

FWIW, this wasn’t the case when 2GreenEnergy was launched in 2009, but over the last decade, the world saw a shocking drop in the levelized cost of energy (LCOE) of solar and wind, meaning that hydro and the others, e.g., geothermal, biomass, solar thermal, ocean thermal, etc. have been relegated to history.