Sure, a random translation site gives "We can inject or absorb up to 1.2 gigawatts of electricity in milliseconds, the equivalent of the power of the nucleus plan", one assumes nucleus plan goes to nuclear plant.

It's the use of 1.2 GW in milliseconds that is at question as it's close to physically impossible and would impress the guys who made CERN.

Still super cool if it's actually just 1.2GWh in a pit (with a reasonable lack of toxicity), personally happy to call it a win with some overzealous reporting / marketing and forget about the whole milliseconds bit.