Borehole thermal energy storage as a seasonal capacitor in the off-grid Arctic energy supply system

Abstract

This master thesis investigated the feasibility of borehole thermal energy storage and solar heating in the high arctic using Longyearbyen in Svalbard as a reference study place. Field work was conducted in Longyearbyen, Svalbard to estimate thermal properties of ground. Modelling of the energy storage was conducted to estimate the efficiency and environmen- tal impact. Preliminary cost estimate was conducted to determine the economical feasibility of the technology in the Arctic. Results of this thesis concluded that the borehole thermal en- ergy storage is technologically possible in the Arctic environment. Cost estimate for the sys- tem appears to be in the higher range, but not extraordinary high when compared to energy prices worldwide. Main concerns related to implementing this technology is the thawing of permafrost.