Did this some time ago, just released it on git hub for anyone interested.
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* Bin\Release folder contains EmonMonitor_Release_AnyCPU.xap for Developper Phones.
* Help and support: http://openenergymonitor.org/emon/node/3748
* Repository : https://github.com/chaveiro/EmonMonitor_WindowsPhone_App
Supports REST API of EmonCMS from http://emoncms.org/
Gets Feeds from API and allow to display in real time value of favorite feeds.
Source code for full app.
Requires: Microsoft Visual Studio 2013 and Windows Phone SDK 8.0+
Re: Released: Windows Phone 8+ Energy Monitor App Source Code
update