Sure, doesn't solve the night issue. Having energy is something, having a stable production from a very diffuse and non stable one (day/night) is something else.

> Iceland power near 100 percent of its electricity from renewable energy, using their abundant geothermal and hydro supplies. Renewable energy can also dominate electricity needs for more populous countries too.

So geothermal and hydro.

> About 80 percent of Brazil's electricity needs for its 209million people come from renewable sources, biomass and hydro mostly. On average, however, renewables power ~29 percent of electricity around the world. So can renewables reach 100 percent for populous countries?

So biomass and hydro.

> He argues that *there is a heavy reliance on hydro and biomass sources* - while most countries don't have access to these, so would be reliant on sources like solar, wind, and storage. In those circumstances, it's highly unlikely for renewables to power 100 percent of the electricity supply he says.

Well thanks, the article itself is making the point I want to make.