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Case Study
20 Fenchurch Street 

Visiting one of London's most iconic buildings, also known as "The Walkie-Talkie," on its Green Team Meeting day was a truly insightful experience. It was exciting to see property managers, tenants, and businesses all in one place, sharing their energy-saving wins through the Go Dark Project and other green efforts.

March 2022 - February 2023

Location: London

1 year achievements

2nd Place



Energy savings

13,425,498 kWh

total savings

£ 2,272,298


Building characteristics


100,284 m2

total area 



Construction completed


37 floors

plus three-story sky garden


1 person per 10m2

Occupational density

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BMS, Roof-mounted PV, HVAC, DHW system, 100% Renewable energy 

Building systems

Cycle spaces - 422

Motorcycle spaces - 19


BREEAM/New Construction (Excellent), EPC (B rating)


Top actions

Management and behaviour

  • Conducted green team meetings to boost awareness and discuss the sustainability agenda

  • GWS Tenant and Simmtronic specialists conducted assessments and maintenance to enable energy adjustments on individual floors


Minor technical and re-programming

  • Initiated Project “ Go Dark”– (Switching off lights from 11pm to 5am), saved 785,000 kWh in July and August compared to 2019

  • Adjusted and reset the lighting dimmer by 40% in the lobby area and switched off exterior lights.

  • Started LED Lighting replacement programme by conducting a lighting review of the emergency staircase, B1, B2, and back of house (replaced approx. 1,140 Lights)

  • Implemented Boiler turn off procedure which switches off the boiler when the temperature exceeds 28 °C outside​

  • Adjusted BMS setpoints in the building to control and manage the energy consumption of building better

  • Implemented Cooling towers variable set points procedure by using outside wet bulb temperature proxy to achieve maximum efficiency in summers


Don't just take it from us

What BNP Paribas says

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“Great to have seen the level of engagements from diverse building stakeholders - from contractors to landlord and building managers to occupiers. It's this level of deep, continuous and diverse collaboration that's needed to reach net-zero and other shared sustainability goals. "

-Joshua Spencer, BNP Paribas RE

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