As we transition to a low carbon energy system we are at a crossroads in terms of the costs of providing energy vs the carbon emissions that emanate from that energy. Hear through the drivers of this market and the opportunities that exist within it.

1. 1
Decentralised Heat Network: Bunhill
Phase 2
EMEX, 21st of November, 2018
Rodrigo Matabuena
Energy Capital Projects Manager
London Borough of Islington

2. 2
Why is Islington developing Heat
Networks?
Heat Networks provide a long term approach to cheaper,
greener heat for our residents giving flexibility of heat
source and :
• Reduced heating costs providing a buffer against
increasing fuel costs, helping alleviate fuel poverty in
the borough
• A long-term flexible and expandable solution
• Reliable and secure energy supply
• Efficiencies of scale
• Reduced carbon emissions

3. 3
Islington Council’s strategic objectives
• Aiming for a 40% reduction in carbon emissions in the
borough by 2020 compared to 2005
• ‘Towards a fairer Islington’ strategy
• Develop community energy networks and services -
well-developed, publicly-owned decentralised energy
programme, improving the security, reliability and cost of
energy.
• Improve the efficiency of council services and reduce
energy costs - from council services, schools and leisure
services, thus allowing Council funds to be directed
towards those that really need them

4. 4
Mayoral commitments
• Clear objectives in the London Environment Strategy to
reduce the city’s carbon emissions
• The GLA aims to ‘develop clean and smart, integrated energy
systems utilising local and renewable energy resources’.
• Waste heat is one of the initiatives aimed at achieving ‘smart
and integrated energy systems’ supported by the Mayor.

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Bunhill heat network development

6. 6
Bunhill Heat and Power
Islington Council launched the Bunhill Heat network in 2012
• 200+ private homes added since
• 1.5km pipe network served by
a 1.9MW CHP and 115m³
thermal store
• Initially serving 600 homes, two
leisure centres and four office
blocks
• Allowed the council to reduce
its tenants’ heating bills by 10%
• Reduced carbon emissions by
around 2,000 tonnes/year

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Developing a heat network
2008 2009 2013

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Planning context
…Promoting zero carbon development by… working with partners
to promote and develop decentralised energy (DE) networks,
with a particular focus on areas of the borough with the greatest
potential for such networks.
…Existing DE networks within the borough will be protected
and their expansion supported.
…All development will be required to contribute to the
development of DE networks, including by connecting to such
networks where these exist [or planned] within the proximity of the
development.
…Major development in areas where connection to a
decentralised energy network is possible should achieve an on-
site reduction in total (regulated and unregulated) CO2 emissions of
at least 50% in comparison with total emissions from a building
which complies with Building Regulations 2006….
The London Plan (July 2011) – 25% target
Islington Core strategy (February 2011).

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Modular construction and installation

10. 10
Bunhill Phase 2

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Celsius project looks at new and existing smart
infrastructure solutions for heating and cooling.
Islington working with Transport for London (TfL) on
extracting heat from the London Underground
Celsius Project – Bunhill Phase II

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Transport for London waste heat strategy
• Mayor’s Transport &
Environment strategy aims to
maximise the utilisation of
waste heat from TFL’s
transport network.
• Of TfL’s transport modes, the
London Underground
produces the most heat,
circa 500GWh pa of heat
(about 70,000 microwaves
working 24/7 for a whole
year).
• TfL have been evaluating
waste heat utilisation at a
number of locations

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LUL Heat Map

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Where does the heat come from?

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Where does the heat go?
• 90% of heat absorbed into clay around tunnels
• LU tunnels built in London Clay, temperature around 14ºC
• Temperature in the clay around the tunnels has warmed over
time and can now reach over 30ºC in summer
Early 1900 19401900
14° 21° 30°
2007

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Mid-tunnel ventilation systems
c. 130 fans across the network

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City Road Disused Station
City & South London Railway
opened 1901, closed 1922
City Road Station in 1915
Shelter in WWII
Old ticket

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Disused Station Passageway

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City Road Vent Shaft
Old station mostly demolished, then used as a mid-tunnel vent
The Vent Shaft in 2016
Old Fan

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Opportunity to work with LUL
Existing
Bunhill
network
Proposed
expansion
City Road
vent shaft
The Bunhill area presented an
opportunity for the two
organisations to work together to
deliver mutually beneficial
outcomes.
LUL vent shaft adjacent to prime
expansion targets for Islington’s
heat network.

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Islington project scope
• Extension of Bunhill main heat network
• Connection of King’s Square Estate (additional 450-500
homes) and Moreland Primary School
• Building of new energy centre at the vent shaft site:
• 1 MWth ammonia heat pump
• 2 x 273 kWh CHP engines
• Total Thermal output: 1.74 MWth
• Increased capacity for future connections

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The solution
Install heat pump to capture the heat from the Underground

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Additional benefit
Summer cooling

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Smart controls demonstration
• New control system enables switching between two energy
centres based on real-time information from National Grid
• Operational model:
• High electricity prices = Operate CHP and generate/sell electricity
• Low electricity prices = Operate heat pump and use electricity
• Heat can be stored if generation takes place outside of peak
demand house
• Allows grid to function with greater proportion of fluctuating
renewable generation

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Working with LUL: Making the project a success
• Engage with stakeholders
• Built strong team including client, contractor and in-house
engineering, manufacturers, maintainers and members of the
supply chain.
• Share knowledge e.g. lessons learnt
• Work together to select the best solution
• Communication links
• Construction coordination
• Sharing facilities where possible

26. 26
3D Model of
new LU Vent
Shaft
Headhouse
Vent Shaft
Fan
Attenuator
Attenuator
Passageway to
running tunnel
IBC Heat
Exchanger
box
Damper

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The site

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Demolition

29. 29
Headhouse foundations

30. 30
Headhouse steel frame

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Headhouse

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Foundations and substation

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The site today

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Challenges
• Site constraints
• Multiple stakeholders on
both sides
• Technically innovative
• Dated infrastructure
• Services… lots of them…
• Civil engineering in the most
densely populated borough
in the Country

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Outcomes
• Islington:
• An additional 450-500 homes benefitting from low-cost heat
• CO2 savings of at least 500 tonnes/year
• Smart controls demonstration
• London Underground:
• Up to 720kW of cooling provided to the running tunnel when run in
supply
• Increased airflow of 70m³/s
• Low carbon electricity provided by Islington CHP engine

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IdentifyOpportunity
Understand Partners
Plan and deliver
Schemes
Next steps
• Islington Council:
• Finalise feasibility studies for new heat networks
• Grow the Bunhill network organically
• Continue investigating other opportunities to use
waste heat
• Part of “Reuseheat” and CELSIUS 2.0 projects
• Develop processes to guide future initiatives and
developments.
• Heat, energy and carbon mapping
• Integrate new technologies
• 5th Generation heat networks
• Batteries
• Local generation

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Thank you!

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Contacts:
Islington Council
rmatabuena@Islington.gov.uk