The Nalubaale Power Station — built in 1954 as the Owen Falls Dam and still widely known by that name — sits just a few kilometres from the centre of Jinja and is the reason the town exists as an industrial centre. The dam harnesses the outflow of Lake Victoria where the Nile begins, generating electricity for Uganda and beyond.
You can't walk on the dam itself, but the structure is visible from the Source of the Nile viewpoint and from the adjacent Source of the Nile Bridge. It's worth understanding what you're looking at: the dam submerged the original Owen Falls waterfall that Speke and subsequent explorers described, replacing one of Uganda's great natural spectacles with a piece of infrastructure that powers the country. That trade-off is itself part of the story of modern Uganda.