Most of the electricity in the Langtang Valley is generated from solar energy. This means there is limited electricity, and all the solar panels must be carried and set up in the mountains. In the rainy season, there can be days without electricity. So, they do not put charging plugs in the room to save on electricity consumption. It would help if you asked the receptionist to charge the phone for you, which might also cost a few extra dollars. This is why we request that our trekkers walk with limited gadgets only.