There's something fishy there alright.
Have been interested in those houses too, - but in no rush to move given the current market
Have been into that estate a few times now over the last year, and as the other posters say, little or no progress, lots of as good as finished houses but no sign of anyone moving in. All very strange and suspect.
Possible there could be a problem with the title, or a planning problem , - eg. even some digression or otherwise from the original planning permission thats now causing a problem. The electricity thing might be a possible reason, but as you say, hard to believe it would be the cause of things dragging on so long.
As you say, the lack of communication really doesn't inspire confidence.
Possible the developer is in some financial trouble, but one would expect that they would be eager to close deals in this case. Might be that they're too far gone though...
Keep us posted, hopefully a reasonable answer will turn up