12. Property, Plant and Equipment

Movement in property, plant and equipment for the periods ended December 31, 2014 and 2013 is below:

O&G properties Refining assets Marketing and distribution Other assets Assets under construction Total
Cost
As of January 1, 2014 865,828 217,000 102,443 10,706 60,271 1,256,248
Additions 206,799 843 279 4,100 48,950 260,971
Acquisitions through business combinations and increase of share in joint operations 106,025 1,823 25 634 108,507
Changes in decommissioning obligations 757 757
Capitalised borrowing costs 8,405 2,193 10,598
Transfers 26,850 14,386 1,987 (43,223)
Internal movement 2,878 (1,630) (1,885) (26) 29 (634)
Disposals (9,633) (1,148) (1,724) (201) (1,293) (13,999)
Translation differences 116,408 18,246 19,608 (64) 3,382 157,580
As of December 31, 2014 1,297,467 260,161 134,930 16,527 70,943 1,780,028
Depreciation and impairment
As of January 1, 2014 (281,435) (56,211) (21,829) (1,230) (360,705)
Depreciation charge (63,405) (9,163) (8,866) (735) (82,169)
Impairment (4,116) (4,116)
Acquisitions through business combinations and increase of share in joint operations (1,990) (1,990)
Internal movement (88) (370) 1,066 26 634
Disposals 3,453 488 944 55 4,940
Translation differences (35,787) (3,094) (3,908) (33) (42,822)
As of December 31, 2014 (383,368) (68,350) (32,593) (1,917) (486,228)
Net book value
As of January 1, 2014 584,393 160,789 80,614 9,476 60,271 895,543
As of December 31, 2014 914,099 191,811 102,337 14,610 70,943 1,293,800
O&G properties Refining assets Marketing and distribution Other assets Assets under construction Total
Cost
As of January 1, 2013 709,528 183,290 84,292 7,757 59,278 1,044,145
Additions 141,463 1,256 105 1,542 50,875 195,241
Acquisitions through business combinations 35 740 1,619 2,033 122 4,549
Changes in decommissioning obligations 2,538 2,538
Capitalised borrowing costs 1,671 166 373 2,210
Transfers 28,397 19,006 1,574 (48,977)
Internal movement 5,249 (122) (2,232) (1,529) (1,366)
Reclassification from assets classified as held for sale 1,217 1,217
Disposals (6,973) (695) (3,537) (816) (691) (12,712)
Translation differences 11,100 3,968 3,190 145 657 19,060
As of December 31, 2013 865,828 217,000 102,443 10,706 60,271 1,256,248
Depreciation and impairment
As of January 1, 2013 (221,754) (48,021) (15,604) (554) (285,933)
Depreciation charge (58,409) (7,840) (7,503) (773) (74,525)
Internal movement (991) 1 783 207
Reclassification from assets classified as held for sale (1,017) (1,017)
Disposals 3,895 112 950 13 4,970
Translation differences (3,159) (463) (455) (123) (4,200)
As of December 31, 2013 (281,435) (56,211) (21,829) (1,230) (360,705)
Net book value
As of January 1, 2013 487,774 135,269 68,688 7,203 59,278 758,212
As of December 31, 2013 584,393 160,789 80,614 9,476 60,271 895,543

Capitalisation rate for the borrowing costs related to the acquisition of property, plant and equipment comprised of 8.72% for the period ended December 31, 2014 (2013: 3.99%).

The information regarding Group’s exploration and evaluation assets (part of O&G properties) are presented below:

2014 2013
As of January 1 53,514 31,709
Additions 35,361 23,605
Acquisitions through business combinations and increase of share in joint operations 24,495
Impairment (4,116)
Unsuccessful exploration expenditures derecognised (810) (975)
Transfer to proved property (66,573) (1,253)
Disposals (183) (1,637)
Translation differences 33,606 2,065
As of December 31 75,294 53,514