[imtringued]

It's actually very sustainable. Renewable energy production follows a normal distribution. The natural gas plants won't have to produce more than 60% of the electricy during the 10 worst days of the entire year. Therefore a 90%+ reduction in emissions is possible without any storage system at all. Add power2gas technology which will be available over the next decade and it suddenly we are not only carbon neutral, we can also capture it. How are you going to store energy without using gas? Oh and did I mention that 10GW worth of natural gas plants costs less than a 1 GW nuclear power plant? Therefore not running natural gas plants most of the year is cost effective.