Answer
$$15,000\ KV.$$
Work Step by Step
Since 1 MV=$10^6$ V and 1 KV= $10^3$ V, then 1 MV=$10^3$ KV. So we have
$$15\ MV= 15\times 10^3 \ KV=15,000\ KV.$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.