https://github.com/cibernox/ember-power-select/issues/956

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
    appName: 'Ember Twiddle',
    selectedCategory: '', //to maintain the selected state.
    businessCategory: '',
    actions: {
        setCategory(value) {
            const category = value.category;//value.get("category")
            this.set("businessCategory", category);
            this.set('selectedCategory', value); //we need to set the selected property as its.
            console.log(this.get("businessCategory"))
        }
    }
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model(){
    return [{'category':'education'},{'category':'education2'},{'category':'education3'},{'category':'education4'}];
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{#power-select class="input" selected=selectedCategory options=model onchange=(action "setCategory") as |category|}}
{{category.category}}
{{/power-select}}
<br>
{{outlet}}
<br>
<br>
<div id="ember-basic-dropdown-wormhole"></div>

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":"1.9.2"
  }
}