Developing the business case in Bristol City Council: Specific

considerations for public sector

Paul Barker, Energy Management Officer

Reducing Carbon Emissions

• BCC CO2 reduction target– 40% by 2020– BCC emissions around 60,000 tonnes– Schools, leisure centres, offices, museums,

etc– 40% reduction equates to 2,000 tonnes

per annum or• 2,000 3kW PV Systems per year OR• 10 500kW biomass boilers per year OR• Much cheaper £/tonne energy efficiency!

Biomass boilers in Bristol

• Blaise Nursery – 1st biomass boiler in Bristol in 2006 supplied from council’s own tree surgery waste– Incorporating a wood fuel station to process tree surgery

waste into wood fuel for further Bristol biomass boiler installations

• Installation of biomass boilers as part of BSF School refurb and retrofit to other sites

• Bristol by end of 2011 will have the largest biomass boiler cluster in the SW and 2nd largest in England

• Using own Wood fuel supply from own resources, to expand use of biomass boilers at the lowest cost

Horfield Leisure Centre

Fonthill Primary

M-ShedBower Ashton

The Park

Gay Elms Primary

BCC EMU Installations

Expanding wood fuel supply in the West

Own resources• Developing Blaise into a site capable

of processing all forms of LA wood waste into wood fuel

The Game Changers? – FIT and RHI and the business

case

• Capital investment reduced due to government spending review

• Use of Prudential Borrowing and other long term borrowing needed to meet CO2 target– Using FIT and RHI to repay borrowing

Small Scale PV - <4kW

Case Study 1 – Small PV

• 3.9kW unit - Cost: £15,600 (£4,000 per kWp)• FIT repayments - £1,300 per annum• Energy generation saving - £200 per annum• Simple Payback – 10.5 Years• With borrowing @5.5% – 16 years• BCC payback (with free elec for school) – 20 years• BUT over 25 years if include cleaning, inverter

replacement, drop in performance • CO2 saving – 1.5 tonnes• Cost per tonne of CO2 – £10,080

50kW Solar PV

Case Study 2 – Medium PV

• 49kW unit Cost: £149,000 (£3,000 per kWp)• FIT repayments - £14,000 per annum• Energy generation saving - £2,000 per annum• Simple Payback – 9 Years• With borrowing @5.5% – 14 years• BCC payback (with free elec for school) – 16 years• Only 18 years (ish) if include cleaning, inverter

replacement, maintenance• CO2 saving – 25 tonnes• Cost per tonne of CO2 – £6,080

BiomassFonthill Primary School

Case Study 3 – Biomass

• 300kW unit Cost: £450,000 • RHI repayments - £20,000 per annum• Energy generation saving (oil to wood fuel)

£23,000 per annum• Simple Payback – 10 Years• With borrowing @5.5% – 16 years• Includes cleaning and servicing• CO2 Saving – 180 tonnes• Cost per tonne of CO2 - £2,500

BCC Plan of Action

• Solar PV on Schools Programme– £1 million of Prudential Borrowing– Free PV with free Elec to school BUT school

must:• Agree to install energy efficiency measures• Agree to energy awareness programme with

staff and pupils– Hope to see savings of 25 tonnes per

Primary School rather than 2-5 tonnes if PV only