In March 2007, West Virginia enacted legislation (SB 441) amending its tax law concerning the business and operation (B&O) tax for wind turbines. Although SB 441 increased the taxable value of wind turbine generating capacity, the taxation level is still significantly lower than that of most other types of electricity generation. For most types of newly constructed electricity-generating units, the B&O tax is calculated by multiplying a pre-determined dollar amount by 40% of the nameplate capacity rating of the generating unit. However, the B&O tax on wind turbines is multiplied by only 12% of the nameplate capacity rating. This results in an effective B&O tax rate on wind powered turbines that is about 30% of the effective tax rate of most other types of newly constructed generating units. Beginning January 1, 2020, the B&O tax on solar photovoltaics is 8% of the nameplate generating capacity.