You can do this with any Smart Life compatible smart plug with energy monitoring. Here’s an automation rule I can set up with it.

https://preview.redd.it/rs75os9y092c1.jpeg?width=1290&format=pjpg&auto=webp&s=a6c6e41e1f7712058b58c7fa9571ec8935887e7e

Options in Europe include

• LightwaveRF : UK based, quite expensive but a very nice looking range of electronic dimmers that are a straight replacement for light switches, including the 4-gang double width switch in your picture . You can then add similar looking wireless switches anywhere you want. Requires dimmable bulbs.
• Philips Hue as others have said. You would replace all your bulbs with Hue, and then you have two choices: wire all the circuits to be permanently on, replace the switch with a blanking plate and use Hue wireless switches to control them, or use Hue smart switch modules that are wired to your existing switch (this requires one module per circuit, so can cause issues with available space in the back box).

Both of these use local radio comms that still works when your Internet is down.