content: We would likely be doing a Dyson Sphere at that point. https://en.wikipedia.org/wiki/World_energy_consumption  The IEA estimates that, in 2013, total world energy consumption was equal to an average power consumption of 12.3 terawatts. (12,300,000 megawatts)  At any moment, the sun emits about 3.86 x 1026 watts of energy; about 1.74 x 1017 watts strikes the earth. 1.74 x 1017 watts = more than 14,000 times what the earth uses in one year, delivered in the space of one second. Meaning that the sun delivers more that 450 billion times the energy that humans on earth currently use right now So could we outgrow the needs? yes, but it will be a while.