According to : https://blockchain.info/charts/hash-rate
The Hashrate per second is 7,700,000 ~ 8,000,000 Terahash/second
With 12.5 Bitcoin/Block reward, 10 Minute Block Time , results 1800 BTC Mined/Day
Based on current price, around $6,500,000 ~ $7,000,000 in BTC is mined.
1) How could i calculate how much is spent in electricity / day?
2) Is the current Reward in Bitcoin - Electricity Price of mining = Positive profit?
Thanks
If you don't count the costs of hardware, yes that would be the profit. I'd say maybe it's half the reward, so $3-4m a day.