The increase in net income attributable to noncontrolling interests reflects higher earnings at our CBF and VESCO joint ventures. Our Versado joint venture, which had lower earnings in 2013, was affected by operational issues, including a fire at the Saunders plant in September, which is still under repair.
Nine Months Ended September 30, 2013 Compared to Nine Months Ended September 30, 2012
The increase in revenues reflects the impact of higher realized prices on natural gas and condensate ($259.3 million), higher commodity volumes ($136.3 million) and higher fee-based and other revenues ($79.2 million), offset by lower realized prices on NGLs ($435.2 million), especially during the first quarter of 2013.
The increase in consolidated gross margin for the nine months was driven by the same factors as discussed above for the three months, partially offset by the planned maintenance and inspection turnaround at CBF for the period from May through July 2013. See "Targa Resources Partners – Review of Segment Performance" for additional information regarding changes in the components of gross and operating margin on a disaggregated basis.The increase in depreciation and amortization expenses was primarily due to the Badlands acquisition, CBF Train 4, Phase I of the international export expansion project, other system expansions and other assets placed in service during the last twelve months. General and administrative expenses increased reflecting increased support for our expanding business operations. Other operating expense in 2012 relates to the Yscloskey plant closure and Hurricane Isaac repair cost as discussed above. The increase in interest expense primarily reflects higher borrowing levels to fund our business expansion ($23.0 million) offset by lower effective interest rates ($1.1 million) and higher interest capitalized on major capital projects ($14.2 million). The increase in equity earnings relates to our investment in GCF, which was profitable in 2013 compared to a loss in 2012 due to a planned shutdown of operations in 2012 related to an expansion of the facility.