Could a blackout explain all of this at once?

Yes, it’s possible for one house to be the only one visibly lit. Backup systems aren’t universal, and some solar setups shut down during a grid outage unless they’re designed to run independently. From outside, you also can’t tell whether a neighbor has a small backup system that simply wasn’t being used.

The water detail fits a power outage pretty well. If the local supply depends on electric pumps, or a building or neighborhood uses a pump to maintain pressure, losing power can interrupt taps too. That doesn’t prove the water and electricity failures had the same cause, but it’s a straightforward possibility.

At 2 AM, an empty road for eight or ten minutes isn’t especially strong evidence of anything unusual. Fog and darkness can make the whole area feel more deserted than it is, and you may not see lights from houses set back from the street. A broad outage could make all those details stand out at once.

If you want to pin down what happened, check whether the outage was reported locally and whether nearby homes had power restored at about the same time. A timestamped note or a view from a different street could help separate a large utility outage from a smaller local fault. I wouldn’t wander around in the dark to investigate, though.