1. Renewable Energy WorkshopBy Kevin MacLennanEnvironmental Engineer
2. Overview• Introduction to Renewable Energy– What is it?– Why Use it?– What are the Technologies• Where is it suitable• Available Financial Support• Can I use Renewables• What next
3. Before We Begin…• Before thinking about renewable energy,consider the energy hierarchy:– Reduce the need for energy– Use energy more efficiently– Use Renewable Energy– Use fossil fuels efficiently
4. Before we begin…
5. Why Use RenewableEnergy?• Renewable Energy can:– Reduce environmental impact– Save money– Increase security of supply– Improve the ‘green’ credentials of yourorganisation
6. Remember…• The biggest returns will always be realisedfrom using renewable energy on site
7. What is Renewable Energy?• Renewable energy is energy that comesfrom resources which are continuallyreplenished such as sunlight, wind, rain,tides, waves and geothermal heat.
8. Renewable Technologies:• Wind• Solar PV• Solar Water Heating• Biomass (including Biofuels)• Hydro-Electricity• Geothermal and Heat Pumps• Anaerobic Digestion
9. Wind Power – What is it?• Power from the windIt’s been around for years
10. Wind Power – Types ofTurbines
11. Large Wind –Suitable for yoursite?Some points to consider:• Is it windy – (Wind Energy Database)?• Is there space?• Connection to the National Grid• Planning permission• High Capital Costs
12. Small Wind – suitable for yoursite?• Again, is it windy (Wind EnergyDatabase)?• Lower capital costs• Do you have an electrical baseload?• Are there space, planning restrictions?
13. Wind Energy Database
14. Solar PV
15. Solar PV – Electricityfrom the Sun• It is a proven technology – in the rightlocation• Low efficiency (~10%) and low energyoutput• Works best where it’s sunny• Not financially viable in UK withoutNIROCs (typical payback of 60+ years)
16. Solar PV – is it right for your site?• Do you have rood space?• ~£1,600 per kW• 14 year payback without NIROCs• 6.1 year payback with NIROC’s
17. Solar Water Heating
18. Solar Water Heating
19. Solar Water Heating• Slightly more effective than PV• Can be effective in the right circumstances• High capital costs compared to returns• Can not be considered as a primarysource of hot water.• Benefits from RHI support
20. Solar Water Heating – Right foryour site?• Available Roof Space?• DHW demand?• £500 per m2 of panel• ~£10-12 saving per m2 per year withoutRHI – 42 year payback• ~£30 saving per m2 per year with RHI (upto 200 kWth output) – 17 year payback
21. Biomass Heating
22. Biomass Heating – is itsuitable for your site• How do you currently heat (oil, gas,electricity)?• Can be very attractive compared toelectricity or oil• Tried and tested technology• Can often be integrated with existingsystems.
23. Biomass Heating – is itsuitable for your site• Requires a lot of space, particularly for fuelstorage.• Most suited to predictable constant loads –good for meeting a heating baseload• Generally works best in tandem with oil orgas heating• Benefits from RHI support
24. Hydro Electricity
25. Hydro Electricity
26. Hydro Electricity• Again, a tried and tested technology• Can be very predictable in terms of output• Highly dependant on site conditions• Capital costs can be high• Well supported by NIROC’s
27. Hydro Electricity – anopportunity for you?• Is there a water source on your site?• Is there a drop in height (head)?• Is there space to exploit it?If the answer to all of the above is yes, thenperhaps Hydro is worth exploring further.
28. Geothermal and Heat Pumps
29. Geothermal and Heat Pumps
30. Geothermal and Heat Pumps• High capital costs for relatively low returns• May be cost effective where excavation isbeing carried out• Unlikely to be suitable as a primary heatsource• Paybacks typically 15+ years
31. Anaerobic Digestion
32. Anaerobic Digestion
33. Anaerobic Digestion• Gas from organic material, such as:– Catering waste– Vegetables– Milk– Manure
34. Anaerobic Digestion• Increasingly popular technology• Requires space and a waste stream• Relatively labour intensive• High capital costs• Can be tricky to get right
35. Anaerobic Digestion – rightfor you?• Do you have a waste stream?• Do you have space?• Can you use the gas?