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Lerwick Peak Load Boiler Station
Marina Business Park, Gremista, Lerwick, Shetland Islands, UK
associated engineer
Not known
date  November 1998, November 1999
era  Modern  |  category  Power Generation  |  reference  HU467444
Lerwick Peak Load Boiler Station uses domestic and commercial waste from the Shetland Islands, the Orknies and the offshore oil industry to generate energy for a district heating and hot water supply system. It also has oil-fired boilers to augment supplies at peak times.
Between November 1998 and November 1999, the oil-fired boilers operated the whole scheme while the waste to energy facility was being completed.
Hot water is pumped from the station around the town of Lerwick through a network of insulated underground pipes. It enters people's buildings through individual heat exchangers, where its heat is transferred to the consumer’s heating system. The supply water itself is not used at this point, only its heat energy.
The underground pipes are made of steel, covered by high-density polyethylene with a layer of polyurethane foam between, and all joints are TIG welded. The supply pipe carries water at 95 degrees Celsius, while the return pipe carries the heat-depleted water back to the plant for reheating — typically at 55-60 degrees Celsius.
In 2006, a 15MWh hot water thermal storage tank was constructed to store heat at night and off-peak, to reduce usage of the peak load boilers. This provided the extra power for the equivalent of 500 connections without additional heat sources.
Ultrasonic meter readings are radio transmitted directly to the operator's offices using a system installed in 2007-08.
In 2008, another 6.5MW boiler was added, bringing the total back-up capacity of the Peak Load Boiler Station to 15MW from three boilers. Using individual customers’ boilers gives a further 6MW of back-up capacity dotted around Lerwick.
By June 2009, some 1,000 properties were connected to the scheme by more than 30km of mains. All types of properties benefit — a sports centre and swimming pool, schools, a fish factory, a dairy, residential care centres, a library, the main hospital, offices, retail premises, a museum, hotels and guest houses, public buildings and homes.
The scheme was financed by the Shetland Islands Council Charitable Trust, the European Regional Development Fund (Highland and Islands Objective 1 Partnership) and the EU Thermie Fund. It is run by Shetland Heat Energy and Power Ltd.
Demand is increasing and extensions to the plant are planned, possibly including a combined heat and power plant. Shetland is not connected to the National Grid.
Research: ECPK
bibliography
www.chpa.co.uk
www.sheap-ltd.co.uk
Location

Lerwick Peak Load Boiler Station