How much energy could the various types of neutrinos be converted into per E = MC[sup]2[/sup] at 100% efficiency?

Then, how many neutrinos would need to be captured (in say a reasonably small = power plant-sized generator) to produce at 1% efficiency (i.e., not total conversion of mass into energy; I think I read that solar fusion is about 4% efficient, so let’s go with 1% to be conservative) to produce enough energy to power New York City?

And is that feasible (mathematically, not necessarily technologically)? I.e., could the flow of neutrinos through the generator sustain that level of power at 1% conversion?

Thank you.