1. West Sussex County Council (WSCC) developed an energy plan to address security, affordability and sustainability for the county. This included various renewable energy and efficiency projects. 2. WSCC considered options for its first battery storage facility at the Westhampnett closed landfill site, including solar farm with battery storage. The site is suitable due to its size and obligations to maintain the site long-term. 3. A 7.44MW solar farm and 4.06MWh battery storage system was designed for the site. This will generate 7.5 million kWh annually, reducing WSCC's emissions by 20% and meeting 25% of its energy demand. Income will come from selling electricity to

1. EMEX Energy Management Exhibition -
Public Sector Energy Storage Investment
Daire Casey – Business Development Manager (WSCC)
Tom Coates- Project Manager (WSCC)
22.11.18

2. Your Energy Sussex- subsidy-free
investment in renewable energy
Summary:
1. Background toWSCCYour Energy Sussex (YES) team development
2. Income generation from WSCC energy assets
3. Case Study- theWesthampnett site- site characteristics and options
considered for our first battery storage facility

3. 1. Background
• TheYour Energy SussexTeam inWSCC
• Energy plan forWest Sussex- three key issues: security; affordability; and
environmental sustainability.
• Examples of projects delivered to date:
- Solar farm investment
- Commercial scale solar
- Domestic solar and gas projects to support social housing
- Public sector estate- LED and solar projects

4. 2. Income Generation from Energy Assets
Core ambitions energy
management at the County
Council :
• Reduced exposure to
market risk
• Lower overall cost
• Optimised assets
• Energy Strategy
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Mid-High
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Low-Mid
Low
Historic profile
RPI

5. energy-hq.co.uk
Working in Partnership &
• The role of the supplier / PPA provider is crucial when
monetising DSR.Aggregators and suppliers must work
together to maximise the value of flexibility.
• Npower Business Solutions Energy HQ worked in partnership
with WSCC to support project development by:
• Business case development and due diligence
• Battery operational requirements and site setup to maximise
revenue
• Policy / industry risks in a 10 year time horizon and potential
impact on business case
• In-house aggregation services to deliver on business case
valuation
• Frequency response qualification and DSR valuation
• Development of bespoke battery import & PPA contracts
• Full integration between npower & Laser to create simple,
structured contracting solution (OJEU compliant)

6. Income streams from energy generating
assets

7. 3.
3. Case Study- Westhampnett Closed Landfill
Site characteristics:
• Previously mixed-use closed landfill site.
• Closed in 1995 and now designated low-
grade brownfield site
• Site is 35 acres/ 14 hectares
• Replacement gas extraction scheme
planned for the site (25 years)
• Statutory obligations to retain the site
(owing to gas migration over 25 years)
• Consent to developing a long-term
solution to the site that matched other
obligations
• Minimal income derived from the site

8. Options considered for the site:
Key high-level options for the site:
• Conventional solar farm with FITs
• Solar farm with private-wire connection
• Solar farm with battery storage
Benefits of PV- storage site to WSCC:
• Subsidy free installation for the life of
the project
• Limitations to private-wire projects
• WSCC’s core energy requirements for
the 20+ years easily
Modelled

9. Summary of site design:
System size:
• 27,665 panel module array
• 7.44MW ballasted solar farm with 4.40Mw Rated power
SMA invertors and 4.06MwhTestVolt battery storage
capacity
• 7.5 Million KWh’s of renewable energy
• Reducing theWSCC annual CO2 emissions by
approximately 20%
• Accounting for 25% of the annualWSCC corporate energy
demand
Income will be generated from the site by the following
means:
• Electricity generated on-site will be ‘sleeved’/ repurchased by
WSCCs energy purchaser, protecting it from energy price
volatility.
• Battery storage will enableWSCC to effectively become a
small scale energy provider; receiving an income through
price arbitrage/ peak shaving) and also receiving an income
from response services such as EFR/ FFR.

10. Key learnings from project Inception through to delivery:
• Initial capital cost didn’t include battery storage
• Site was low-grade land , many sensitivities existed
• Considerable interest from boards of governance in the storage system :
Performance warranties, safety, longevity, operation and maintenance
• Due diligence work undertaken by a number of specialist consultancies on the
scheme
• Operating model for the scheme - more risk owing to OFGEM uncertainty and
lack of a guaranteed funding stream
• Operational risk was scrutinised at every level

11. Opportunity to WSCC:
• WSCC as developer of its own land (positive and negative)
• Access to low interest borrowing
• Approval to develop long-term energy schemes
• Significant energy consumption onWSCC buildings (£11.5 Million
per year~£250million over 25 years )
• Significant support by officers and elected members

12. Closed Landfill Site – Design Challenges
• No penetration or excavation of the cap allowed

13. Closed Landfill Site – Design Challenges

15. Thankyou
Tom Coates -Tom.coates@westsussex.gov.uk
Daire Casey- Daire.casey@westsussex.gov.uk