The Starfield Alternating Currents choice - whether you should side with Louisa or Zoe - sees you choosing between the Trade Authority or MAST after setting junction boxes around The Well. When you first meet Louisa Reyez there, she asks for your help fixing a power drain, which eventually leads you to Zoe Kaminski from the Trade Authority.
Soon after meeting them both, you have to decide who to side with, so I've tried both and covered the Starfield Alternating Currents outcomes here, keeping it mostly spoiler-free.
Should you choose Louisa or Zoe in Alternating Currents?
Both Louisa Reyez and Zoe Kaminski want you to pass on information exclusively, forcing you to chose between the two parties. But here's the thing: your choice doesn't actually matter. Whoever you chose, you'll get a thank you and 2,000 credits.
From what I've seen, there's no other consequences to your choice, be it disappointing or pleasing your Starfield romance option or other Starfield companions, or causing any difficulties with your chosen Starfield faction. I completed Alternating Currents about seven hours into Starfield, and have returned a few times to see if it has any bearing on my story, but some 70 hours later, there's no consequence that I can see.
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