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EUROPE’s gas inventories have continued to accumulate later into the start of the traditional winter heating season than any other year in records dating back to 2011. Gas inventories in the European Union and the United Kingdom (EU28) were still rising on November 13, later than the previous record of November 12 in 2011 and far past the median peak occurring on October 26. The late fill is attributable to a combination of warmer-than-normal temperatures and high prices rationing consumption. Late fill is lifting inventories close to a record high and reducing the probability stocks will fall critically low before the end of winter:
GREAT BRITAIN’s maximum winter loads on the transmission system since 1990/91 are illustrated in the chart below (loads exclude Northern Ireland which has its own electricity network). Loads shown are “triads” – the three highest half-hourly loads separated by at least 10 days occurring each winter between November and February. Triads are used to set transmission network use of system (TNUoS) charges for large electricity consumers who are metered on a half-hourly basis. Triads are declared retrospectively after the end of each winter in March (“What are electricity triads?” National Grid, 2018).
Half-hourly (HH) customers are billed for TNUoS based on the amount of electricity they use during the three triad half-hours. Triads set charges for the entire year. In the limit, if a HH consumer uses no electricity from the grid during those three half hour periods, their TNUoS is set at zero for the entire year. The possibility a triad might be declared gives HH customers a strong incentive to minimise electricity use and/or generate their own power during periods when the total load on the network is expected to be very high.
Triad charging helps reduce strain on the grid during the winter peak, usually between 1630 GMT and 1800 GMT, when street lighting comes on, families start preparing the evening meal, but many shops and offices are still open and occupied. Several consultancies offer triad forecasting services – alerting HH consumers when there is an elevated risk that a triad could occur so they can reduce their net load temporarily.
In winter 2021/22, triads occurred on Thursday December 2 (43.7 GW at 1630-1700 GMT); Wednesday January 5 (42.8 GW at 1700-1730 GMT); and Thursday January 20 (43.5 GW at 1700-1730 GMT) (“Triads 2021/22”, National Grid, March 29, 2022).
Triad loads have been declining since 2007/08, and especially since 2010/11, as a result of improvements in energy efficiency, sluggish economic growth, changes in the industrial mix, and an increase in self-generation by HH consumers as well as embedded generation from solar panels added to homes, offices and local distribution networks: