The Clean Energy Patent Growth Index (CEPGI), published quarterly by the Cleantech GROUP at Heslin Rothenberg Farley & Mesiti P.C. provides an indication of the trend of innovative activity in the Clean Energy sector from 2002 to the present. The CEPGI also ranks the leaders among Clean Energy Patent Owners, along with the Countries and the U.S. States which receive the most clean energy patents.
Two geothermal patents were granted in 2011 to Kimberly Peacock while Mine-RG, Ormat Technologies, Inc., Ryland Wiggs, Echogen Power Systems, and Ivan Kocis et al., each received one patent. Kalex, LLC continues to lead in geothermal patents (8) overall since 2002 despite not having any patents in 2008-2011. GE, Ormat and Nuovo Pignone S.p.A. are the next closest at 3 total geothermal patents since 2002.