Local authority Technology class Year 2017 2018 2019 2020 2021 Argyll & Bute Biomass 11 5 4 2 3 Heat pump 110 120 169 529 646 Solar thermal 7 1 2 0 1 Total 128 126 175 531 650 Eilean Siar Biomass 0 0 0 1 0 Heat pump 96 154 217 225 313 Solar thermal 7 3 1 0 5 Total 103 157 218 226 318 Highland Biomass 42 22 17 17 14 Heat pump 214 397 432 436 692 Solar thermal 33 31 32 22 46 Total 289 450 481 475 752 Moray Biomass 8 4 6 6 3 Heat pump 72 52 68 65 142 Solar thermal 10 14 18 12 14 Total 90 70 92 83 159 Orkney Islands Biomass 0 3 1 2 0 Heat pump 115 83 143 96 123 Solar thermal 4 7 22 17 19 Total 119 93 166 115 142 Shetland Islands Biomass 0 0 0 0 0 Heat pump 61 68 77 42 93 Solar thermal 2 0 0 0 0 Total 63 68 77 42 93 Total Biomass 61 34 28 28 20 Heat pump 668 874 1,106 1,393 2,009 Solar thermal 63 56 75 51 85 Total 792 964 1,209 1,472 2,114 ?