As the January 7 deadline to resolve non-performing assets (NPAs) in the power sector has passed, around Rs 1 lakh crore of bad debt in the sector remains unresolved, according to banking sources. FE has learnt that banks may refer Coastal Energen, Rattan India (Nashik), Emco Energy, GVK Power (Goindwal Sahib), Simhapuri Thermal and Jaiprakash Power Ventures to the National Company Law Tribunal (NCLT). Lenders have already referred KSK Mahanadi and Meenakshi Energy to NCLT.