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The Tower - One St George Wharf

Location: St George Wharf, Nine Elms Lane, London SW8 2LR

Construction started: March 2010

Estimated completion: 2014 Status: Under construction Storeys: 52 Height: 185m

View of One St George Wharf from across the Thames

120 rpm even in very high wind conditions, when other turbines would be turned off on safety grounds,” says Prickett. “Specifically designed to work in turbulent wind conditions, it is well suited to the blustery conditions found in urban environments.” Unlike the ‘conventional’ horizontal- axis wind turbines, Matilda’s Planet’s VAWT is drum-shaped with two rotors in a stack configuration, approximately 10m high and 6m in diameter. It has a single generator rated at 10kW and, dependent upon wind conditions, will produce around 30,000kWh per annum.

> Development and benefits

According to Prickett the development process − from acquiring the design and production rights to final manufacture − took 14 months: “Once we built it we had it on trial. It’s now in our factory being painted, and we expect installation to occur later this year.”

Wind turbine: 10m vertical- axis wind turbine (VAWT)

But the benefits to the developer go

beyond the VAWT’s basic design. “While the current Mark 1 model has not yet been tested and certified for the ‘Feed- in Tariff’, it is able to feed directly to a landlord’s power supply within a building, providing green energy and reducing energy costs,” explains Prickett. Other benefits include: a 10-15% reduction in S106 contributions; 100% Capital Allowances due to the investment in renewable energy; and the potential to unlock planning permission for sites, especially in rural locations (because the VAWT provides renewable energy and is less visually intrusive than traditional turbines). There is also potential to use it on existing buildings. “We are undertaking significant development to produce a turbine that has a solid investment case, irrespective of the wider development benefits that will open up a market for retrofitting to existing buildings, says Prickett While the operational benefits are

threefold: “Firstly, the turbine is round and uni-directional, so it can take wind from any direction, unlike an HAWT, which requires rotating to catch the wind from a particular direction. “Secondly, the VAWT’s self-starting nature means no energy pulse is

Client: St George South London Limited

Contract Type: Design and Construct

Architect: Broadway Malyan

Structural Engineer: Robert Bird & Partners Services Engineer: Grontmij

Main contractor: Brookfield Multiplex Construction Europe Ltd

Description: 232 apartments; business lounge; screening room; gym and spa; swimming pool.

required, further reducing operating costs and environmental impact. Thirdly, it actually moves faster than the wind speed − some two times faster − due to its aerodynamics. “This means it will operate all the time, whether wind speed is high or low, meaning it is capable of generating energy almost all the time. This gives the owner a cost and efficiency benefit throughout the building’s life cycle.”

> Future development Having secured sales for its Mark 1

VAWT, Matilda’s Planet is now working on further increasing its efficiency and generating capacity, which will further improve its commercial viability. Development work will include the

creation of a steel and composite stator to reduce weight and wind loading, making it better suited to fitting to existing buildings, and an electro-mechanical clutch, which will allow a second generator to cut in at higher wind speed, greatly enhancing electrical output and significantly improving return on investment. “We’re also considering manufacturing a smaller 5m-high by 3m-wide model for schools and hospitals, as well as the low- and medium-rise housing market,” says Prickett.

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