APL was used extensively by the CEGB [1] not only in forecasting power/grid demand, but also for modelling the location and construction of many of the power stations themselves.

[1, as an example] https://dl.acm.org/doi/abs/10.1145/22008.22027

Now lost, the Tinsley viaduct towers are fondly remembered by most of the people in Sheffield, even prompted some art: I have this on my wall https://weliveherejw.wordpress.com/portfolio/the-cooling-tow...