Forest and others;
There are at least two types of geothermal power.
The common ones like those in New Zealand where hot thermal springs
occur and the hot dry rocks like Geodynamics in South Australia.

The rocks are some miles down and are granite which has been heated by
radio active decay. They are building a pilot plant there of I think
10 Megawatt.

They have another site in the Hunter Valley, close to the grid and
when they perfect the technique they expect to build a major plant there.

This will be a base load plant with all the operational advantages
of gas fired power stations. If they perfect the system all wind
farms will be out of business.
Most solar systems I imagine would not be able to compete as the
losses in storage systems would be too great.