This is the paragraph that justifies the headline: > Already, the cost of discharging a 100-megawatt battery with a two-hour power supply is roughly on par wit

This is the paragraph that justifies the headline: > Already, the cost of discharging a 100-megawatt battery with a two-hour power supply is roughly on par with the cost of generating electricity from the special power plants that operate during peak hours. Such batteries can discharge for as little as $140 a megawatt-hour, while the lowest-cost “peaker” plants—which fire up on demand when supplies are scarce—generate at $151 a megawatt-hour, according to investment bank Lazard.