Bad luck day
Hello BOAC,
Well, just a total electrical failure (also battery dead), would of course not inhibit normal gear extension, because the primary system is hydraulic (the opening of the up latch hooks).
The extension itself is free fall already.
If the total electrical failure is accompanied by hydraulic failure, yes, then you are without gear extension, but for that unlikely combination of failure, there is the back up mode of a belly landing.