Analysts at the energy conference in Mexico City debated if the downward trend that has made Mexico the cheapest country for renewable energy would carry into the fourth energy auction in November.
Battery storage has not featured prominently in the country's energy market but that could change soon and drastically, industry representatives think.
Some indigenous groups, however, oppose the planned infrastructure which would connect the Peruvian region with the country's national grid.
The bill was approved in principle by a committee of the lower house and combines two previous proposals.
In his first state of the nation address, President Lenin Moreno also criticized his predecessor and corruption in energy projects.