Oct 18 (Reuters) - Encana Corp ECA.TO
* Encana to update five-year plan during Investor Day; company expects to deliver leading corporate returns, strong cash flow growth and substantial free cash flow
* Encana Corp - through its five-year plan, company expects its return on capital employed will climb to between 10 to 15 percent
* Encana - expects to deliver about 25 percent compound annual growth in non-GAAP cash flow, around $1.5 billion cumulative adjusted free cash flow through 5-year plan