Though most of the sources for these ideas come from conspiracy theorists, there are those that say that the Egyptian pyramids were built as some form of pumps, or to generate electricity. The methods by which these design purposes are achieved, as described by the websites and such, do appear to be scientifically sound.
So, regardless of whether or not the pyramids were originally intended to fulfill the function of water pump or electrical generator, could they have, being complete in structure and not the modern ruins, have actually done either of these?