Technology Householder Stream Average Cost Per Unit Community Stream Cost Ranges Solar £3,289 £3,528 - £132,000 Wind £16,610 £16,950 - £45,514 Hydro £10,876 £12,908 - £23,216 Ground Source Heat Pump £11,039 £6,300 - £1,824,961 Biomass £8,742 £9,131 - £530,566 Biofuels £65,360 - £383,400 District Heating £2,975 £142,885 - £530,566 Combined Technologies £3,443 - £880,083 The following...