X0306 4 2018-04-24 1 0001172136 US GEOTHERMAL INC HTM 0001427911 Walker John H C/O US GEOTHERMAL INC. 390 E PARKCENTER BLVD, SUITE 250 BOISE ID 83706 1 0 0 0 Common Shares 2018-04-24 4 D 0 6709 5.45 D 0 D Common Shares 2018-04-24 4 D 0 5333 5.45 D 0 I Father Common Shares 2018-04-24 4 D 0 5233 5.45 D 0 I Spouse Stock Option (Right to Buy) 4.08 2018-04-24 4 D 0 13889 D 2017-03-28 2022-03-28 Common Shares 13889 0 D Stock Option (Right to Buy) 4.02 2018-04-24 4 D 0 16666 D 2016-03-31 2021-03-31 Common Shares 16666 0 D Stock Option (Right to Buy) 2.88 2018-04-24 4 D 0 16666 D 2015-05-15 2020-05-15 Common Shares 16666 0 D Stock Option (Right to Buy) 4.44 2018-04-24 4 D 0 16666 D 2014-04-02 2019-04-01 Common Shares 16666 0 D Stock Option (Right to Buy) 2.76 2018-04-24 4 D 0 16666 D 2013-07-22 2018-07-22 Common Shares 16666 0 D The shares were disposed of pursuant to a merger agreement between the Issuer and Ormat Nevada Inc., a subsidiary of Ormat Technologies, Inc. (the "Ormat Merger"). Reflects grant date; the options were subject to a vesting schedule and were 75% vested on the date of the Ormat Merger. The reporting person received $19,027.93 as consideration for cancellation of the options pursuant to the Ormat Merger. Adjusted to reflect 6:1 stock consolidation effective November 10, 2016. Reflects grant date; options were subject to a vesting schedule and were 100% vested on the date of the Ormat Merger. The reporting person received $23,832.38 as consideration for cancellation of the options pursuant to the Ormat Merger. The reporting person received $42,831.62 as consideration for cancellation of the options pursuant to the Ormat Merger. The reporting person recevied $16,832.66 as consideration for cancellation of the options pursuant to the Ormat Merger. The reporting person received $44,831.54 as consideration for cancellation of the options pursuant to the Ormat Merger. /s/ Kerry D. Hawkley as attorney-in-fact for John H. Walker 2018-04-26