Hi David. First up apologies for the long delay in getting back to you. This actually sounds like an awesome idea. I get the idea you're going for and i'm not 100% that CRISPR is all that necessary for this. Essentially you're coupling the production of ATP synthesis in plants with it's usage in the production of electricity in Eels. The production of ATP is a multi step pathway in plants.

While each of these proteins has it's own special job in the pathway to creating ATP, the last protein (ATP Synthase) is what makes the most ATP through the flow of Hyrdogen ions from the bottom to the top (which represents two sides of the Chloroplast wall. What i'm getting at, it's not just a matter of expressing the protein to get it to make ATP. The proteins also have to be in a specific arrangement. This means that you can't just have the needed proteins floating around a test tube, shine some light on it, and expect some ATP to come out. check out a paper called

CELL-FREE ARTIFICIAL PHOTOSYNTHESIS SYSTEM

I could see a couple of ways your idea could work. You either create an artificial system like the one in the paper above. You modify chloroplasts in someway to incorporate the usage of the electrocytes instead of sending ATP to be used up in the Krebb's cycle OR you modify the plants.

In Australia were somewhat limited in what we can do because of facility requirements. Genetically modifying plants requires a higher level of compliance we at BioQ can't meet. So we can't work with plants. However working with chloroplast might be an idea, you could even try to grow them outside of the plants. Anyway if you're still curious about this idea, let me know! Now that we've finished our move i'll be more watchful over all of our communication channels :)