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I also like the second to last one. I would just think about maybe changing the colour.
Now, I'm not exactly sure of your target market and such like, so you would have more idea than me, but it just seems a bit dull.
I know you don't want something childish or too vibrant... but my mind just can't associate this logo with generating energy! I hope you understand what I mean.
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I do agree with you. I will definitely try some other options to try and bring it to life. I love Chanteuse as a colour and it can be really vibrant while not too 'green' (as well as being a bit different). I used that kind of colour of some branding a couple of years ago though, and I don't want to be too much of a one trick pony hahaha.