Load shedding and shifting

Load shedding and shifting, it’s the top topic on everyone’s lips right now and no wonder, it can be a confusing concept and with winter fast approaching time is of the essence.

We are being approached more then ever for our advice on load shedding and shifting and how it can reap energy savings but we are also spending time educating some businesses on the need for load shedding strategies. This interest and at times confusion has prompted us to create our ten-point guide to load shedding….

Load shedding and shifting: Load shedding and shifting is about avoiding peaks and troughs in energy usage by minimising the part of the energy bill driven by peak consumption.

TNUoS / DUoS: Peak consumption is driven by charges - TNUoS and DUoS, which are essential charges that pay to move electricity from the place of generation to wherever it is needed. DUoS charges operate between 4-7pm each week day evening and between 12-2pm for London businesses.

TRIADS: TNUoS uses TRIADS (the three highest peaks of electricity demand between November and February) to distribute higher charges between electricity suppliers, based on how much electricity is being consumed by the supplier’s customers. Such transmission costs can be reduced if demand is decreased when a TRIAD is expected, these half-hourly periods normally occur between 4pm and 6pm on weekdays and there must be at least ten days between individual Triads

Peak: Businesses need to avoid, if they can, setting a peak, which will allow them to make considerable savings on demand charges.


Switching off: In its most simplistic form load shedding and shifting ‘could’ be switching off a piece of electrical HVAC equipment during peak periods and switched back on afterwards. In reality doing this would affect the building performance and comfort levels would be adversely affected. By controlling the HVAC equipment in a more sophisticated way, such as pre-cooling a building, the electrical load can be shifted affectively without disrupting the comfort levels in the building.

t-mac: Our t-mac BeMS is that more sophisticated option! t-mac allows for the implementation of load shedding/shifting activities thereby reducing costs at the high-peak DUoS and TNUoS times and helps accommodate reduced load/demand.

Control strategy: t-mac has a DUoS control strategy integrated into its set-up, allowing for load shedding and shifting activities to take place around the DUoS time bands. This achieves greater energy cost savings for customers whilst maintaining a watchful eye on the internal conditions to ensure business functions are not affected.

Warnings: Incorporated into the t-mac system is a direct feed from Utilitywise (our parent company) energy markets team to allow the devices to receive TRIAD warnings and in turn, quickly an agreed load-shedding activity thereby reducing winter TRIAD costs due to being billed on a lesser consumption amount at that period in time. We can then action additional controls to ensure that when the winter TRIADS strike, consumption at that period in time is at its lowest possible without affecting business operations.

Savings: By implementing load shedding and shifting over the winter months and reducing TRIAD charges, many of our clients are expected to save in the region of £150k with the t-mac BeMS control strategy and up to 20% off their energy bills due to higher kWh costs in these times.

Demand response ready: Management of consumption in DUoS and TRIAD times is a key component to the future of BeMS in light of the P272 changes on class 5-8 meters from April 2016. An ability to receive a feed on a TRIAD warning and instantly communication to multiple sites in a matter of minutes means that t-mac BeMS customers, can make their business estate, demand response ready.