The sun gives us us not only source of power, but a limit on what we can use. It's very approximately a kilowatt per square metre absolute maximum. Thats an ideal, we can't harvest it all, but if you hope for an improvement from current 1-2% for solar power to 20% say, that gives us 200W/square metre, or about 10kW if I covered all the property I own in solar high tech panels.

Anything we use more than that- not just domestic consumption, but hidden costs like transport, services, imports and so on- is burning up the planet's savings.