Samples of Al/polyimide Langmuir-Blodgen film/Au and Al/Al2O3 ultrathin film/Au (MIM) deposited on a glass substrate (1/4 the size of the microscope slide glass) have continuously released electrical energy for about 3 years without any excitatory operations of other sources. The 0.026 degrees C decrease of the sample temperature caused by the electrical energy generation of 7.7 x 10(-9) J was ascertained on the sample by a non-contact temperature measurement apparatus using a vacuum avalanche photodiode. It is considered that thermal energy is converted to electrical energy in the sample. Furthermore. the I-V characteristic curve of the sample does not pass through the origin of the co-ordinates of I and V. This phenomenon indicates that the sample gives electrical energy to a source of applied voltage, and the sample acts as an energy source which releases electrical energy by absorbing thermal energy from the surroundings.