def get_generators_in_mix(db, name='market for electricity, high voltage'):
    """Get names of inputs to electricity mixes"""
    inputs = set()
    for act in db:
        if act['name'] == name:
            for exc in act.technosphere():
                producer = exc.input
                if producer['unit'] == 'kilowatt hour':
                    inputs.add(producer['name'])
    return inputs
