Mexico's state utility announced a drop in consumer power bills for the fourth consecutive month in August.
Researchers are working on using the by-products of tequila production to produce biomass and energy, which could account for 5% of the country's electricity generation in a decade's time.
In June, the countries' energy ministers met in Lima where they confirmed their commitment to the cross-border link.
Russian state power company Rosatom says a Brazilian government official "showed interest" in the technology during a meeting in Saint Petersburg.
A roundup of Brazilian power sector news.
Selling a stake in the company's construction arm is also being assessed.