The companies whose transactions create bitcoin do well when the currency is up, but need more energy to keep going.

Using stored renewable energy can help the grid — and be profitable for battery operators — especially when electricity demand is high.

As ACs across the country kick on during heat waves, electricity demand will spike and some energy grids may fall short of supply.

They help when the sun isn’t shining and the wind isn’t blowing but everyone’s AC is on full blast.

The number of proposed solar projects has spiked as costs have declined, but the transmission system can’t accommodate them.