Landsvirkjun

Possible power supply reduction postponed

22. September 2015

Water status in Landsvirkjun’s reservoirs improving

Landsvirkjun has decided to postpone any possible reduction to the supply of electricity to customers for a period of one month. This is in accordance with the provisions outlined in Landsvirkjun’s flexible contracts. However, there is still some uncertainty as to whether the reservoirs will reach full capacity before the winter period begins.

The summer months of July and August were rather cold and this created unfavourable conditions for the inflow to reservoirs. Ablation levels were also low as a result and were particularly low in July when the rate of ablation is generally at its highest level. The inflow rate and air temperature increased slightly in mid-August despite a rather dry month. The flow rate was close to the average for the time of year in all operational areas at the end of August. The water status in Landsvirkjun’s reservoirs was poor towards the end of August, particularly in the Hálslón Reservoir. Landsvirkjun subsequently decided to inform its customers that it would need to utilise the provision built into its flexible contracts and reduce the power supply this winter.

The weather in the first few days of September was fairly calm. Temperatures were lower than in late August, particularly in the highland areas, which subsequently reduced inflow rates. Warm air flowed in from the south and across the country on the 5th of September and was accompanied by precipitation and strong winds. These conditions continued for the next few days and the warmest day of the summer was measured on the 7th of September with temperatures reaching 24.1°C in Seyðisfjörður.

Historical inflow rate measured in the Hálslón Reservoir in September

There was rapid improvement to the inflow rate as a result of the warmer weather, particularly in the east of Iceland where the daily inflow rate average at the Hálslón Reservoir reached 580 m3/s, on the 13th September. This is the highest rate measured in the month of September since the Hálslón Reservoir was put into use. The overall status of Landsvirkjun’s reservoirs has improved significantly and reservoir capacity is currently at 85.5% but was at 69% at the end of August. The greatest increase has been in the eastern part of Iceland where the Hálslón Reservoir has seen a 12 metre increase and reservoir capacity has increased from 59% to 84%. The reservoir capacity of the Þórisvatn and Hágöngu reservoirs has increased from 83% to 89% during the same period and the Blanda Reservoir has gone from 67% to 74%.

Landsvirkjun will continue to review the situation and will announce any changes as appropriate.

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