I've been examining the demand data available through from the Demand Trend Report and the Grid Export data. Comparing the data from 2009 to 2016, there is a difference from 700 to 1200 GWh between the annual totals, with Demand Trends being greater than the Grid Export data. I've attached a rough image with time series plots of:
- Left: NI and SI data
- Middle: The difference between the Demand Trends and Grid Export
- Right: Demand Trends divided by Grid Export data
The time resolution is 1/2 hour.
I assume the difference is due to Embedded Generation? Is that correct? Or are other adjustments involved with the Demand Trends data?
Thank you in advance.