CREATE TABLE table_name_26 (power__mw_ INT, voltage__kv_ VARCHAR, country VARCHAR)

Which Power (MW) has a Voltage (kV) of 500, and a Country of argentina?
SELECT AVG(power__mw_) FROM table_name_26 WHERE voltage__kv_ = 500 AND country = "argentina"
SELECT AVG("power__mw_") FROM "table_name_26" WHERE "argentina" = "country" AND "voltage__kv_" = 500