It's a subsistence economy, for the most part. It's agricultural a bit, like everywhere else in Ethiopia. This year in particular was what they call a bumper year, meaning that the rainy season was exceptionally good throughout Tigray, but there was a locust invasion. Actually, the war started in the midst of the worst locust invasion that Tigray has faced, and when the farmers were harvesting their crops. That's what compounded the problem.
On February 16th, 2021. See this statement in context.