Technically it's not infinite. The sun emits about 10^26 Watts of solar radiation energy produced from the nuclear fusion of about 4*10^6 tonnes of hydrogen per

Technically it's not infinite. The sun emits about 10^26 Watts of solar radiation energy produced from the nuclear fusion of about 4*10^6 tonnes of hydrogen per sec, i.e. a 100% efficient dyson sphere would capture that much energy at most.