Can I use ADUM6000 to power ADE9153A and ADUM4152?
The input of ADUM6000 is 3.3V and the Output is 3.3V isolated.
In this case the output current of ADUM6000 is 40mA.
Is 40mA used to power ADE9153A and ADUM4152?
The ADuM4152 has Typical Performance Curves for help determining your power needs. It will be dependent on data rate and loading on the SPI bus lines.
If 40mA works out to be the required budget, the ADuM6000 will provide that. There is also the ADuM6028 that can meet that budget, but requires less pcb area that the ADuM6000.
Check out the Supply Current tables in the ADuM4152 for maximum current. Table 5 would be for 3.3/3.3V operation.
Those figure are with outputs unloaded. Remember to consider capacitive loading on the bus lines also (c*v^2*f)