Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the total capacity (MW) of the farm that is noted as being under construction?

### Inputs:
table_name: table, columns: ['Wind farm', 'Capacity (MW)', 'Country', 'State/Province', 'Notes']

### Response:
SELECT COUNT Capacity (MW) FROM table WHERE Notes = under construction