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fuel_type
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anthracite, biogas, biomass, coal, district_heating, dual, elec, grid_displaced_elec, lpg, misc_a, misc_b, misc_c, misc_d, misc_e, misc_f, misc_g, misc_h, misc_i, misc_j, misc_k, misc_l, misc_m, misc_n, misc_o, misc_p, misc_q, misc_r, misc_s, misc_t, misc_u, misc_v, misc_w, misc_x, misc_y, misc_z, nat_gas, none, oil, smokeless, waste
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