power-select-scroll

components.my-options-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  didInsertElement(){
    this._super(...arguments);
    this.$('').css('max-height', '100px');
    this.$('').css('overflow-y', 'auto');
    this.$('').on('scroll',	function(){
   			console.log('my options scroll');
			}); 
  }
  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
   
  mySelected: null,
  
  myOptions:['aaa', 'bbb', 'ccc', 'ddd',
            'eee', 'fff', 'ggg', 'hhh',
            'iii', 'jjj'],
  
  actions: {
  	myChangeAction(val){
      this.set('mySelected', val);
    }
    
  }
  
});

templates.application.hbs

Look at the browser console while scrolling on options
<br>
{{#power-select options=myOptions onchange=(action 'myChangeAction') placeholder='power-select options' selected=mySelected optionsComponent='my-options-component' as |name|
}}
  {{name}}
{{/power-select}}
<br>

templates.components.my-options-component.hbs

{{#each options as |option index|}}
{{option}}
<br>
{{/each}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  }, 
  "addons": {
    "ember-data": "2.12.1",
    "ember-power-select": "1.9.6"
  }
}