In the most recent 12-month period, ENB had $7.3 billion in cash from operations and two billion shares. That gives us $3.65 in operating cash flow per share. So, the cash flow payout ratio is only 72%. That's more than enough for Enbridge to continue paying — even raising — its dividend for the foreseeable future. Of course, a deterioration in its business performance would change all that. But in this environment of oil scarcity and energy shortages, ENB's business looks safe as milk. So, the $4,890 in tax-free TFSA income you can get from this stock isn't particularly risky.