ISET Economist Blog

A Persistent Negative Generation-Consumption Gap, a Puzzle to Be Explored
Friday, 31 May, 2019

Looking at consumption and generation trends, it is evident that since August 2018 consumption typically exceeded generation. The negative generation-consumption gap also remained throughout April, amounting to 45 mln. kWh, with a total power generation of 966 mln. kWh and consumption of 1,012 mln. kWh. Yet why has the generation-consumption gap remained negative since August 2018? Should we also expect the negative gap to persist over the following months?

Figure 1. Generation-Consumption Gap

A negative generation-consumption gap in April is a relatively unusual, and recent, phenomenon. Since 2007, it has happened only four times, (in 2007, 2014, 2017, and 2019), three of which occurred in the last six years, with the widest negative gap of 117 mln. kWh in April 2017.

Figure 2. Generation-Consumption Gap for April

There are two key factors that determine the negative gap between generation and consumption, namely, power plants’ decreased generation and the country’s increased consumption. As the Georgian electric system is heavily dependent on hydropower plants, it is important to look at the average generation of HPPs between 2007-2017, and the generation within the last twelve months.

Figure 3. HPP Generation; Figure 4. Enguri & Vardnili Generation

Enguri HPP and Vardnili HPP (the dams with pumped storage) represent a major source of electricity and their production trends provide a picture for the typical generation potential within the indicated periods. Comparing the average generation from 2007-2017 to the last twelve months, one can see that power productions levels were significantly higher in the summer of 2018 (May, June, July), rather than the 2007-2017 averages in the same period. The trend remains similar for the Enguri and Vardnili HPPs, which highlights that the increased electricity provision relates to increased generation of the existing regulatory HPPs, rather than to new entrants on the electricity market. Over most of the past twelve months, HPP generation was above the average generation of 2007-2017. An initial consideration is whether the jump in electricity generation by HPPs, particularly Enguri and Vardnili, in the summer of 2018 was due to abundant precipitation, or whether it was a direct response to increased demand that forced the use of dam reservoir resources. The available information, however, does not offer a simple response. Enguri and Vardnili undoubtedly generated a below-average quantity of electricity in certain months, though this was not the case for overall HPP generation. Nevertheless, even in poorer than average months, the typical generation was fairly similar to 2007-2017 averages (with the exception of March 2019) and thus may have been caused by other factors.

Considering consumption levels over the past twelve months and the average consumption level between 2007-2017 (Figure 5), one can see that consumption increased substantially above average. This undeniably contributed to the persistent negative gap over the past nine months, and it might well be one of the main causes for the perpetuation of the gap. It seems clear is that HPP generation has remained relatively stable over the last decade, while electricity demand has been ever increasing.

Figure 5. Consumption Trends

These features raise several further questions: In relation to 2007, why has HPP generation failed to rise, even though a greater number of HPPs are currently operational (at least on paper)? What are the foremost causes behind the increased demand and the main sources of consumption growth? What trends can be expected in the future? Each of these questions requires further investigation, and we will address them over the coming months.

The views and analysis in this article belong solely to the author(s) and do not necessarily reflect the views of the international School of Economics at TSU (ISET) or ISET Policty Institute.