What is the best Power Grid expansion for a beginner to buy?
closed as off-topic by Pablo, Tynam, Patters, Paul Marshall, Alex P Jan 9 at 17:30
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For a beginner, I would say no expansion is necessary at all. Vanilla Power Grid is an incredibly deep game. I have found that it can be a bit overwhelming and introducing additional complexity will only make it harder.
Personally, some of my favorite games (Agricola and Dominion being two examples) I grew bored with the base game quickly and vastly prefer playing with the expansions. Power Grid is not one of those games. I have played it for years, and often still play just the base game even though I do own one of the expansions (Robots).
Disclaimer: I take a very analytic approach to board games. More casual players might not find it as overwhelming as I do.