In his newest book Risto Isomäkiargues that instead of only one solar power revolution the world will see four different ones, each complementing the achievements of the previous ones.

Besides this the book claims that the technologies of the third and fourth solar power revolutions could also be used in radio astronomy and for searching radio messages sent by extraterrestrial civilizations.

SETI Revisited is an updated and expanded version of Isomäki's 2012 book CETI Revisited, Should we Send Radio Messages to Faraway Galaxies?.

The Great Visionary of Finnish fiction and non-fiction has never been as breathtakingly visionary as in this volume. 2012 CETI Revisited was called ”an exceptional fireworks of new ideas” and SETI Revisited contains much new material.

The Four Solar Power Revolutions:
2005 - Crystalline silicon
2015 - Thin-film, heat-resistant, building-integrated
2030 - (?) Concentrating photovoltaics
2100 - (?) Space mirror-assisted