You need a staggering amount of wood and if you want to produce them in a really sustainable way, you simply cannot. You would be able to produce such amount of wood nicely in a sustainable way, you would sell it for furniture or construction wood for way more money.
The only heat from wood I know are really well (not only on the paper) managed are the ones directly working with a network of sawmill to reuse the waste and usually, they are small.
Burning wood even discharges more CO2 in the atmosphere, than coal[1] and we haven't even started to talk about where all those trees must be grown to keep up with the demand of an energy policy based on solar/wind + biofuel backup, like we are planning in Denmark.
It is not a terribly good idea and it is infuriating how little science and facts matter to a political discusssion that one would think was based around those elements.
[0] https://www.nytimes.com/2018/05/03/opinion/pruitt-forests-bu... [1] https://iopscience.iop.org/article/10.1088/1748-9326/aaa512/...