I'm on level 27, have Intelligence 10, but cannot build the large generatore due to the Science 1 level still being locked.

What else do I need?

Thanks

Do you have the Science perk unlocked? As in you put a perk point into Science? Simply being Int 10 doesn't matter if you don't have a perk point into the specified perk, which in this case is Science.

You need to manually assign points into each perk line. As above, Int 10 is just your Intelligence score which lets you access the perk lines.

lvl 1 science locked? then get the actual perk lmao

it is in the INT branch.. a vaultboy with a laserbeam (if you can't find the logo, the logo is also displayed menus that show LOCKED at the right of your screen)

You have to select individual perks as you level up. As others have pointed out, having your intelligence at a high enough level to unlock the science perk doesn't mean that you actually HAVE the science perk. You have to use one of your level up points to actually get that specific perk. Follow the intelligence column down to the science section, and get that perk the next time you level up. Then you'll be able to build the large generator and any other workshop items that require the rank 1 science perk.

Thanks for the quick response