Question: Name the number of stacks for 1 & 2 235 mw 3 & 4 88.2 mw
Schema: create table table_23958917_1 (stacks varchar, unit_capacity__2009_ varchar, PRIMARY KEY (stacks))
SQL: select count(stacks) from table_23958917_1 where unit_capacity__2009_ = "1 & 2 235 mw 3 & 4 88.2 mw"