According to the NASA website Energy from the Moon, that assuming we perfect the helium-3 ($^3\text{He}$) nuclear fusion technology required, that $^3\text{He}$
would generate only a very slight amount of radioactivity, equivalent in nature to that produced by hospitals in their nuclear medicine areas. When used in this plant,$^3\text{He}$ would have so much energy that it would require only 20 tons-less than one Shuttle load-to supply all the electricity used in the United States in a year.
Thus, it would be very beneficial for colonists on other worlds. So, my question is has there been proven sufficient $^3\text{He}$ reserves on the Moon (and other inner solar system worlds) that would make developing and implementing this power source viable?