The Haryana Chief Minister, Mr. Om Prakash Chautala, will lay the foundation stone of the 220 Kv sub-station at Rania and 132 Kv sub-station at Madhosinghana is Sirsa district tomorrow. A spokesman of the Haryana Vidyut Prasaran Nigam (HVPN) said here today that construction of these sub-stations was being taken up under an improvement scheme for strengthening the power transmission network in Sirsa.