A few points...

1. Pumped storage of water between high and low reservoirs. Takes lots of water, and a big height difference, so only useful in some areas.

Transmission losses in a power grid are a big problem. To minimise them, you produce the power close to where it is needed, and you transmit it at a high a voltage as possible. This is much easier with large power stations, rather than lots of small ones, which is waht renewable installations tend to be at the moment.


And biomass cannot possibly work on a large enough scale. The Brazilian ethanol fuel programme is the best example, and that only works as there is a very large area, which is suitable for a fast growing, energy rich crop. When people talk about Bio fuels for cars in the West, they are normally refereing to Palm oil, produced in South East Asia, on sites cleared of rainforest. Very green!
The energy demand of people on this planet is so large, that even if we could grow a very good fuel crop, and harvest it cheaply and efficiently, we would need many times more land in production to grow the fuel. Exactly how much land I'm not sure, but I recall a study showing that our current energy usage was 3-4 times the Net Primary Productivity of the Planet....


You want to get serious about CO2? Minimise usage, Nuclear power stations, and as many sensible renewables as possible, and a whole load of electrolysis plants. We can run everything on electricty and hydrogen if we try. The problems generated by nuclear waste are can be controlled far more easily than those from CO2.