> "the energy costs of manufacturing and sending a rocket to outer space versus putting that fuel into a generator"

I believe it's on the order of magnitude of 100x return (for a low-orbit space photovoltiac panel that's (almost) always facing direct sun).

    (/ (* ([W (kg -1)] 200)   ;; reasonable space PV power/mass ratio
          ([year] 10)         ;; guess at lifespan
          ([ton] 100))        ;; Starship payload
       (* ([ton] 1000)        ;; tons of liquid methane in Starsihp
          ([J (kg -1)] 5e7))) ;; specific energy density of CH₄
    
    ;; => 126.226944