Well, the article is about developing new geothermal technologies and funding them. It also discusses how costs are driven down as the tech develops. The article didn't try to comprehensively cover experimentation in geothermal generation. Developing this tech seems well within the reach of current knowledge unlike fusion. There could be room for geothermal at higher costs than solar because of their different characteristics as supply sources.

Although solar and wind costs have been driven to such low levels that they dominate new electrical source spending the expectation is for them to continue to decline.

Fun idea: Giant airplane to deliver huge wind turbine blades that are too big to go by road or rail radia.com: WindRunner | Radia

Grid-scale battery installations are on a price-performance improvement trend as well.

I hope fusion projects, especially the much studied and experimented with Tokamaks, will succeed. ITER and Commonwealth Fusion could succeed.

It gives me some insight into predicting the future to read the late and somewhat famous Professor John McCarthy's thoughts on energy and other issues:

http://www-formal.stanford.edu/jmc/progress/index....

One point I got from him is that there are many alternatives though at higher costs. Our world is rich in resources as long as you don't think costs have to remain the same.

On into the brave new future!

Shaun