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You basically plug them into your power outlet and feed back into the system, reducing your electricity bill.

If it's a hybrid inverter, it just offsets what you pull from the grid. And btw, as long as you have the right voltage and grid-frequency, you can practically push as little as you want. The details and roadblocks usually come in the form of regulation, contracts, meter features, and the utilities trying to stonewall any sort of slow phase-out of people's dependence on them.

1.5 Million 400 watt modules ist Not nothing.

Yes they are grid tied.

Is it 600 MWatt equivalent? It's curious how the grid adapts at the end of the day

Currently through a lot of dispatch orders. Basically shutting off some PV parks or wind farms and paying them money.

The market reacts now by installing a lot more energy storage (battery parks) to make a profit from that which will lead to a lot less dispatch.

In Germany this year we have a record number of energy storage projects happening.