Re: Episode 1
Well, the series certainly has an interesting way of naming its characters. The family names are numerical, while the given name is colour-based which is reflected by each girl's hair.
Akane and Aoi are red and blue of course. The other 2 main girls are Wakaba (young leaf aka green) and Himawari (sunflower aka yellow). Even Momo (peach) has pink colour hair.
If I had to guess, the energy machine is extracting power from the light spectrum or something like that.
The transformation scene was interesting to say the least. It looked like Akane got powered arms like Symphogear's Hibiki