Sounds like Tennessee Valley Authority, in which case 50% of your energy mix is fossil fuels and 0% of the biomass plant is fossil fuel and the incremental effect is potentially negative on atmospheric carbon.

It’s 46% and it’s irrelevant if it’s not replacing any existing power generation.

There is more excess data center power demand than there is capability to build plants over the next 10 years, so if this plant isn’t built the likely result is 1 less data center and not releasing carbon from 5.5 million tons of timber per year.