Backend services run continuously, which makes energy use an important part of software design. This paper presents measurements from our benchmark framework for web servers running on the Erlang virtual machine. We compare Erlang, Elixir, and Gleam software using several web server frameworks under static, dynamic, and WebSocket workloads. Green software research shows that sustainability must be addressed at the application layer. Our results extend this view to BEAM web stacks under controlled load. The measurements reveal clear differences between languages and frameworks, with some stacks keeping stable throughput and lower energy under stress, while others show longer runtimes or reduced success.