The Bower at Stockley Park December 16 1

Strutt & Parker

Positive Energy

December 16

Resources & Energy

The Bower at Stockley Park

Energy Costs Report

Strutt & Parker

Energy

Contents

1.0 Introduction 2

2.0 Building Performance Comparison

with Existing Offices 2

3.0 Financial Comparison with Existing

Offices 3

4.0 Commentary 4

The Bower Energy Costs Report December 16 2

1.0 Introduction The Bower Building is an energy efficient new office development which has just been completed. The pre-construction

design and energy evaluation predicted an Energy Performance Certificate (EPC) rating of a high B, however the actual

construction has achieved an impressive ‘A’ rating. The actual EPC score is 21 and the post construction BREEAM

submission has targeted an ‘Excellent’ rating with a score of 80.65%.

Some of the features which give the building this rating are as follows1:

� Highly insulated external fabric with high performance glazing to reduce heat loss.

� Solar shading on external facades

� Air tightness rating 3.4m³/(h.m²) 70% better than 2010 Part L regulations (unchanged from 2006 regulations).

� Electrical energy generation from 370m² Solar PV panels

� VRF heat recovery air-conditioning system.

� Low NOx high efficiency gas boilers

� Heat recovery ventilation (HRV), saving energy and reducing heating costs.

� Natural ventilation solution for reception and atrium areas

� Low water consumption with dual flush WCs, aerating low flow taps, low flow showers and sensor activated low flush

urinals.

� High level of sub-metering and zoned temperature control.

� Good natural day lighting to reduce use of artificial lighting. Artificial lighting is occupancy and daylight controlled

and LED’s are used throughout the building.

The figures in this report are based on the Post-construction EPC certificate (Appendix A) and the BRUKL Output

Document (Appendix B). They are compared with the ‘Typical’ Office Building as defined in the Chartered Institute for

Building Services Engineers (CIBSE) Energy Efficiency in Buildings (ECG019) – Energy Use in Offices. The document

provides ‘Typical’ and ‘Good Practice’ energy use, cost and carbon emission benchmarks for office buildings in the UK.

2.0 Building Performance Comparison with Existing Offices Figure 1 shows the data from Table 1 and compares energy use on a per square feet basis2 at the Bower to a ‘Typical’

and ‘Good Practice’ Office Building3.

Figure 1- Annual kilowatt hour energy consumption per sq.ft

1 http://www.thebowerbuilding.com/ 2 Floor area taken from EPC total useful floor area 3 CIBSE and EPC figures converted from m2 to sq.ft using a conversion factor of 10.764 sq.ft per m2.

0

5

10

15

20

25

30

35

40

kWh/sq.ft/year

CIBSE Typical Office Building

CIBSE Good Practice Office Building

Bower

The Bower Energy Costs Report December 16 3

The Bower significantly outperforms both the ‘Typical’ and ‘Good Practice’ Office Buildings for energy consumption with

significant improvements across most energy use categories4.

The ‘Typical’ Office Building can be likened to office stock constructed in the 1990’s prior to the introduction of Part L of

the building regulations. The ‘Good Practice’ office building is broadly equivalent to office buildings built between 2006

and 2010. The Bower makes an improvement over Part L2A 2013 of 43%5.

Table 1- End Use Energy Consumption Summary Table

Building Heating & HW

kWh/sq.ft/.year

Cooling

kWh/sq.ft/year

Auxiliary

kWh/sq.ft/year

Lighting

kWh/sq.ft/year

Equipment*

kWh/sq.ft/year

Total

kWh/sq.ft/year

Typical UK

Office

16.53 2.88 5.57 5.02 3.62 33.63

Good Practice

UK Office

9.01 1.30 2.79 2.51 2.14 17.74

The Bower 1.06 0.28 0.55 0.94 4.11 6.95

* Equipment includes items such as computers, servers and printers which are not part of the design specification of the

building. They are estimated based upon typical usage related to office buildings in the EPC modelling software. Energy

used by equipment does not count towards the total for emissions calculations.

Good practise design lists electrical design load for small power as 10w/m2 however, The Bower has an electrical design

load higher than this. This is the reasoning for the higher than good practise value seen under the equipment heading

and is common for new buildings due to the ever increasing use of technology by occupants. The design value is notional

and will be entirely under the control of the occupant as it relates to IT equipment, mobile device chargers and other

small electrical items.

3.0 Financial Comparison with Existing Offices The financial benefit realised from lower energy consumption per sq.ft when occupying The Bower compared to

occupying a ‘Typical’ Office Building of the same type is shown in Figure 2. This assumes an energy price of 4.046p/kWh

gas and 10.07p/kWh for electricity6.

4 Subject to CIBSE building model 5 EPC Benchmark rating B (Score 37) if Newly Built 6 Pricing from DBEIS Commercial Energy User Pricing 2016; 2nd Quarter Average

The Bower Energy Costs Report December 16 4

Figure 2- Financial comparison

4.0 Commentary Compared to the CIBSE ‘Typical’ and ‘Good Practice’ Office stock benchmarks, The Bower Building performs

exceptionally well on energy use across all categories of fixed energy consumption. The total figures represent The

Bower as being two times better performing than good practice and three times better than the typical office building.

The Bower design and construction has achieved a BREEAM “excellent” rating with the assessment taking into account

the high performance systems specified. The BREEAM excellent rating is an indicator that The Bower is an energy

efficient building and will offer a high level of comfort to its occupants.

As mentioned in Section 2 the energy associated with ‘Equipment’ is higher than the ‘Typical’ value however this is

entirely notional. Equipment energy consumption will depend on the occupant’s use of technology and the function of

the space and therefore more technology intensive occupants will have higher Equipment energy values.

With energy prices being somewhat unpredictable in recent years, coupled with increasing demands for environmental

responsibility, the benefits of leasing an energy efficient building will only increase over time. Energy price security is key

for successful business and having the ability to record and demonstrate mandatory carbon reporting and CSR targets

is both important and cost efficient.

Energy prices have experienced peaks and troughs in recent months due to artificially low oil prices, however they have

begun to rise as predicted and The Bower offers a hedge against this.

Energy policy is now focused on commercial buildings (Minimum Energy Efficiency Standards and ESOS) and occupants

will experience more regulation in respect of their individual energy use. The Government are in consultation now to ‘Reform the business energy efficiency tax landscape’ with the aim to introduce mandatory energy reduction targets

and/or carbon tax penalties. Occupying an energy efficient building like The Bower limits the risks imposed by these

regulations which are aimed at more inefficient buildings.

Green Deal Information

The Green Deal will be available from later this year. To find out more about how the Green Deal can make yourproperty cheaper to run, please call 0300 123 1234.

Energy Performance CertificateNon-Domestic Building

Certificate Reference Number:0780-2932-0396-2070-9030

4, Roundwood AvenueStockley ParkUXBRIDGEUB11 1AF

This certificate shows the energy rating of this building. It indicates the energy efficiency ofthe building fabric and the heating, ventilation, cooling and lighting systems. The rating iscompared to two benchmarks for this type of building: one appropriate for new buildings andone appropriate for existing buildings. There is more advice on how to interpret this informationon the Government's website www.communities.gov.uk/epbd.

Energy Performance Asset Rating

Technical Information Benchmarks

Main heating fuel: Natural Gas

Building environment: Air Conditioning

Total useful floor area (m2): 16691

Building complexity (NOS level): 5

Building emission rate (kgCO2/m2): 10.99

Buildings similar to thisone could have ratings asfollows:

If newly built

If typical of theexisting stock

Technical Data Sheet (Actual vs. Notional Building)

Building Global Parameters Building Use

Actual NotionalArea [m ]2

External area [m ]2

Weather

Infiltration [m /hm @ 50Pa]3 2

Average conductance [W/K]

Average U-value [W/m K]2

Alpha value* [%]

* Percentage of the building's average heat transfer coefficient which is due to thermal bridging

16691.316550.9LON35436.030.3310.32

16691.316550.9LON50010

% Area Building TypeA1/A2 Retail/Financial and Professional servicesA3/A4/A5 Restaurants and Cafes/Drinking Est./Takeaways

100 B1 Offices and Workshop businessesB2 to B7 General Industrial and Special Industrial GroupsB8 Storage or DistributionC1 HotelsC2 Residential Inst.: Hospitals and Care HomesC2 Residential Inst.: Residential schoolsC2 Residential Inst.: Universities and collegesC2A Secure Residential Inst.Residential spacesD1 Non-residential Inst.: Community/Day CentreD1 Non-residential Inst.: Libraries, Museums, and GalleriesD1 Non-residential Inst.: EducationD1 Non-residential Inst.: Primary Health Care BuildingD1 Non-residential Inst.: Crown and County CourtsD2 General Assembly and Leisure, Night Clubs and TheatresOthers: Passenger terminalsOthers: Emergency servicesOthers: Miscellaneous 24hr activitiesOthers: Car Parks 24 hrsOthers - Stand alone utility block

Energy Consumption by End Use [kWh/m ]2

Actual NotionalHeating

Cooling

Auxiliary

Lighting

Hot water

Equipment*

TOTAL*** Energy used by equipment does not count towards the total for calculating emissions.** Total is net of any electrical energy displaced by CHP generators, if applicable.

1.8835.9510.169.5944.2730.58

2.535.393.3319.419.8444.2740.5

Energy Production by Technology [kWh/m ]2

Actual NotionalPhotovoltaic systems

Wind turbines

CHP generators

Solar thermal systems

3.97000

0000

Energy & CO Emissions Summary2

Actual Indicative TargetHeating + cooling demand [MJ/m ]2

Primary energy* [kWh/m ]2

Total emissions [kg/m ]2

72.1569.4510.1

90.1897.5417.1

* Primary energy is net of any electrical energy displaced by CHP generators, if applicable.

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