I'm not sure what change affected it, the cooling tower (when actively cooling) displays the flashing missing fuel warning even though the tower is electric.

Hi! I've tried to reproduce bug with clean install only apm nuclear and apm's coal & steam - got nothing. Can you pls provide save file for bug investigation and game version?

The bug is reproduced now

the RRR mod using some invisible entity for creating steam output animation:

-- adds the steam entity to the cooling tower when it is build
function add_cooling_tower(tower)
-- the steam entity makes happy clouds when the tower is active
-- this is needed because the cooling tower is an electric furnace, and only burner furnaces can produce smoke
  --logging("---------------------------------------------------------------")
  --logging("Adding new cooling tower with ID: " .. tower.unit_number)
  local steam = tower.surface.create_entity
  {
    name = STEAM_ENTITY_NAME,
    position = tower.position,
    force = tower.force
  }
  steam.operable = false -- disable opening the happy cloud maker's GUI
  steam.destructible = false -- it can't be destroyed (we remove it when the cooling tower dies)
  steam.get_fuel_inventory().insert({name="solid-fuel", count=50}) -- at 1 watt, this is enough fuel to run for 39 years, should suffice
  steam.fluidbox[1] = {name="water", amount=1} -- water for dummy steam puff recipe
  steam.active = false -- start inactive
  table.insert(storage.towers,
  {
    id = tower.unit_number,
    entity = tower,
    steam = steam
  })
  --logging("-> tower successfully added")
  --logging("")
end

Seems to be some fails with solid-fuel.

Try fix with 0.32.08 pls

Fix successful! Thank you for the fix, and the amazing mod.

Thx! I wish you a great engi-game run!)