This present invention relates to an intermediate storage for intermediate storage of solid and liquid waste from e.g. toilet(-s), sink(-s), shower(-s), wash basin(-s) and/or water consuming machines before the waste is transported away, wherein the intermediate storage comprises at least one reservoir for reception and batchwise emptying of waste and carrier fluid by gravity. The invention also relates to a sewage system for solid and liquid waste comprising e.g. water toilet(-s) with or without urine separation, sink(-s), shower(-s), wash basin(-s) and/or water consuming machines, and an intermediate storage for intermediate storage of the waste, before it is transported away. The invention also relates to a water toilet with or without urine separation, provided with an intermediate storage, a sink or sink unit comprising an openable or removable strainer, lid and/or a removable water trap, provided with an intermediate storage and a compost container. In addition, the invention relates to a method to extract energy from waste water.