When 8.9% is the electricity reduction percentage how many sets of tonnes of co2 saved is there?
create table table_29538735_1 (tonnes_of_co2_saved varchar, _percentage_electricity_reduction varchar, PRIMARY KEY (tonnes_of_co2_saved))
select count(tonnes_of_co2_saved) from table_29538735_1 where _percentage_electricity_reduction = "8.9%"