atlantica yield owns, manages and acquires a diversified portfolio of contracted assets in the power and environment sectors. we operate high-quality facilities recently constructed, with long useful lives. our long-term contracts with creditworthy counterparties permit to generate stable and long-term cash-flows. we currently own 20 assets, comprising 1,441 mw of renewable energy generation, 300 mw of conventional power generation, 1,099 miles of electric transmission lines and 10.5 mft3 per day of water assets. all of our assets have contracted revenues (regulated revenues in the case of our spanish assets) with high-quality off-takers. 95% of our cash available for distribution is generated from assets where off-takers have an investment-grade rating, the rest being unrated. our assets have a weighted average remaining contract life of approximately 22 years as of december 31 2015. our portfolio is diversified both by business segment and geography. by geography, we are present in n