Generating more and more electricity from solar and wind will require natural gas-powered peaking plants as backup, argues John Miller at The Energy Collective.

Miller says in part: "Peaking power must be on-line at some minimum rate and available to quickly adjust to variable renewables power supply changes as required to continuously control power grids supply-demand balances within operating safety limits.Natural gas is an excellent source of both peaking and baseload electric power supply. 

"Due to its high capacity factor (87%), high efficiency and relatively low fuel cost and emissions, natural gas power supplies power grids reliably and cost effectively compared to other currently available peaking power alternatives (petroleum, biogas, etc.). 

"These factors make natural gas peaking power the ideal backup for increasing penetration levels of wind and solar power supply"

You can read Miller's entire column here.