Natural gas is mostly fossil, but in my country (Finland), where total gas consumption is 26 TWh per year, the capacity for bio-generated gas (mostly from waste

Natural gas is mostly fossil, but in my country (Finland), where total gas consumption is 26 TWh per year, the capacity for bio-generated gas (mostly from waste, e.g. processing of sewer waste) was 350 GWh a couple of years ago and is growing rapidly. So, currently around 1.5 % of methane gas is renewable. It is estimated that up to 10 TWh per year could be generated, which would bring the proportion to something like one third. From point of view of greenhouse gas emissions, the impact is quite large because methane produced by biological decomposition is a potent greenhouse gas, so having more of it burned in power plants is definitely good.