You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
The app would not accept 0.0 on off peak for a custom plan. But if Started with Reliant Centerpoint Totally Free nights Solar, it defaults to 0 or blank and also accepts 0 or blank for off peak/super off peak.