New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  options: ['one', 'two', 'three', 'four', 'five'],
  val: null,
  
  actions: {
    handleOpen(select, e) {
      select.actions.search(this.get('val'));
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<div id="ember-basic-dropdown-wormhole"></div>
{{#power-select options=options selected=val onchange=(action (mut val)) onopen=(action 'handleOpen') as |opt|}}
  {{opt}}
{{/power-select}}
<br>
<br>
Check if this works

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"   
  }
}