My Landlord Did Not Pay The Power Bill Causing Me To Lose $615.00 In Income. He Verbally Told Me To Deduct It From The Rent, And Now He Wants His Money. What Can I Do?

I own a dance studio and rent space in a building. The landlord is responsible for paying the utilities and he apparently did not and our power was shut off for a day. My loss of income for that evening was $615.00. The landlord told me to deduct it from the rent or I could send the whole rent and he would send me a check back. I did not trust him to do so, so I deducted it. He says I am only entitled to $41.67. He threatened to turn our power off if not paid.