EIA for proposed (1X800 MW) North Chennai Stage-III STPP at Villages Ennore and Puzhudivakkam, Ponneri Taluk, Thiruvallur District, Tamil Nadu. EXECUTIVE SUMMARY 1. INTRODUCTION TANGEDCO established 3 x 210 MW North Chennai Thermal Power Station Stage-I and 2 x 600 MW Stage-II in NCTPS Complex at Ennore and Puzhudivakkam Villages, Ponneri Taluk, Thiruvallur District in Tamil Nadu. The Stage-I Plant was commissioned during 1995 and Stage II was commissioned in 2014. An area of 190 acres of barren land is available within the existing NCTPS. In order to offset the power demand of Tamilnadu, TANGEDCO has proposed to set up a coal based 1 x 800 MW super critical thermal power plant, Stage III within the North Chennai Thermal Power Station (NCTPS) complex using the existing infra structure facilities viz., Cooling water channel/Coal conveyors of NCTPS. The sea water for cooling water requirement for the NCTPS Stage-I is drawn from the Ennore Port Basin located adjacent to the NCTPS Complex, through an intake channel. Another channel was constructed to draw cooling water for the requirement of NCTPS Stage-II and TANGEDCO’s proposed Ennore SEZ Thermal Power Project which is located near the NCTPS Complex. The drawal capacity of this channel is 65 cumec. After the drawal of Cooling water for NCTPS stage II TPP (2x600 MW) and Ennore SEZ TPP (2x800 MW), around 10 cumec is available. This balance quantity is proposed for the cooling water requirement of NCTPS stage III TPP adopting Natural Draft cooling tower system. Desalination plant will be established to obtain raw water for the plant purposes. 100% Imported Coal from Indonesia will be transported through pipe conveyor from proposed Coal Berth 3 of Ennore Port. Hence there is no land acquisition/Right of Way (ROW) for Coal conveyor/Cooling water system. The proposed project falls under Project/ Activity 1(d) – Thermal Power Plants and Category A ≥ 500 MW (Coal/ Lignite/ Naphtha & gas based) project under the schedule as per EIA notification issued on 14th September, 2006 and hence the project requires Environmental Clearance from MoEF, Govt of India. Terms of Reference (TOR) was obtained from the Ministry of Environment and Forests, Government of India vide their letter no. J-13012/14/2012-IA.II (T), dated: 28.05.2012 and extension of validity of TOR vide their letter dated 08.09.14. As per the requirement of TOR, the following studies were conducted and the reports are prepared. Ramky Enviro Engineers Ltd., Hyderabad E-1 EIA for proposed (1X800 MW) North Chennai Stage-III STPP at Villages Ennore and Puzhudivakkam, Ponneri Taluk, Thiruvallur District, Tamil Nadu. 1. Terrestrial EIA/EMP report-Consultant M/s Ramky Enviro Engineers (P) Ltd, Hydrabad. 2. Comprehensive Marine EIA/EMP- Consultant M/s IIT/Madras and M/s WAPCOS/GOI 3. Socio Economic survey report of surrounding villages within 15 Km from the project site-Consultant-Madras school of social works, Chennai 4. CRZ Map demarcating the project site with foreshore facilities viz.,Cooling water intake and Out fall, Coal conveyor system of the proposed project in 1:4000 scale-consultant-Institute of Remote sensing, Anna university/Chennai 5. CRZ map delineating CRZ zones in 7 KM radius around the project site- consultant- Institute of Remote sensing , Anna university/Chennai 2. NECESSITY OF THE PROPOSED PROJECT Lack of availability of sufficient electric power has always been one of the greatest deterrents to the economic growth of the state. It is to be noted that there is a deficit of about 3500 MW during the 12th plan period up to the year 2016 and the surplus of 498 MW is noticed only after the establishment of the present proposed project along with other new power projects proposed by TANGEDCO. Salient Features of the proposed Project Site are given in Table 1 and Technical Details of the proposed 1X800 MW Coal Based Super Critical Thermal Power Plant are given in Table 2. Table 1 Site Environs of the Study Area Particulars Details Village Ennore & Puzhudivakkam, Ponneri Taluk, Location Thiruvallur District, Tamil Nadu 13°14’0.83” to 13°14’49.37” North Latitude and Geographical Positions 80°19’7.49” to 80°19’37.24” East Longitude Toposheet No. 66 C/3, C/4, C/7, C/8 Distance for CRZ >500m (Away from CRZ Regulations 1991) Ground elevation The ground elevation of the site is +9 M above MSL. Predominant Wind direction WSW Nearest Highway SH 104 (Chennai Pulicat Road) at 4.7 km West Nearest Railway Station Athipattu pudunagar at 2 km in West direction Nearest Airport Chennai at 36 km in South-West direction Nearest Sea Bay of Bengal, East- >500m Nearest Sea Port Ennore Port – 3 km in North direction Nearest Village Ennore 2.5 km (South), Minjur 6.5 km (West) Ramky Enviro Engineers Ltd., Hyderabad E-2 EIA for proposed (1X800 MW) North Chennai Stage-III STPP at Villages Ennore and Puzhudivakkam, Ponneri Taluk, Thiruvallur District, Tamil Nadu. Table 2 Technical Details Fuel Source and Consumption Source of Fuel : 100% Imported Coal through M/S MMTC, New Delhi; Fuel Gross Calorific Value Imported Coal : 6000 Kcal/Kg Annual generation at 100% PLF : 7008 MU Annual generation at 85% PLF 5957 MU Plant heat rate (approx) : 2100 Kcal/Kwhr Water Source and Quantity Source of Water : Sea (Bay of Bengal) & Desalination plant Raw Water Requirement : 6900 m3/hr (165600 m3/day) Wastewater Generation : 5113 m3/hr (122705 m3/day) Treatment Scheme : Separate ETP & STP’s will be provided Land Total Land Required : 76.9 Ha Plant & Equipment Boiler & Auxiliaries Boiler : Pulverised Coal Firing Boiler (PC) – 1 Nos Type : Once through, supercritical with single pass or two-pass type, single reheat, balanced draft and suitable for outdoor installation Steam Parameters per Boiler : Pressure – 256 ata : Temperature – 568/5950C Turbine & Auxiliaries : Tandem compound, reaction type, double reheat, regenerative, condensing, multi- cylinder design with throttle governing, directly coupled with generator suitable for indoor installation. The turbine comprises of a single flow HP turbine, a double flow IP and two cylinders of double flow LP casings Ash Generation & Handling Total Ash : 806.4 TPD Fly Ash : 645.12 TPD (Dry) Bottom Ash : 161.28 TPD (Wet) Cooling System Cooling Tower Re-circulating type with Natural Draft Cooling Existing Intake Channel : 65 m3/sec Capacity Cooling water available for this : 10 m3/sec Ramky Enviro Engineers Ltd., Hyderabad E-3 EIA for proposed (1X800 MW) North Chennai Stage-III STPP at Villages Ennore and Puzhudivakkam, Ponneri Taluk, Thiruvallur District, Tamil Nadu. project Chimney No. of Chimneys : 1 Height of Chimney : 275 m high Manpower requirement During Construction phase : 175 Personnel’s During O & M : 550 Personnel’s Cost Total Project Cost : Rs. 4800 Crores Cost for EMP : Rs. 480 Crores 3. BASIC REQUIREMENTS 3.1 Land The detailed break up of the land for various activities proposed in the Thermal Power project is given as Table 3 Table 3 Details of the Land break Description Area Acres Ha % Main Plant Area 25 10.12 13.2 Water system (cooling tower, Raw water & fire water) 15 6.07 7.9 Misc. buildings & ware house area 20 8.09 10.5 Vacant land for FGD Plant 5 2.02 2.6 Coal stock yard area 20 8.09 10.5 Pre assembly/storage yard area* 10 4.05 5.3 Green belt 45 18.21 23.7 Roads, drains and others 5 2.02 2.6 Internal corridor (cooling water & coal conveyor) 15 6.07 7.9 Switch yard 20 8.09 10.5 External corridor (sea water & coal conveyor) ** 10 4.05 5.3 Total 190 76.88 100 *On completion of job this area will be utilized for green belt **To be acquired/leased from EPL (Ennore Port Ltd) Ramky Enviro Engineers Ltd., Hyderabad E-4 EIA for proposed (1X800 MW) North Chennai Stage-III STPP at Villages Ennore and Puzhudivakkam, Ponneri Taluk, Thiruvallur District, Tamil Nadu. 3.2 Coal Requirement and Availability Different options are explored for meeting the coal requirements of the proposed project considering the inputs mentioned in Table 4 and coal quantities and characteristics under various options is given in Table 5. Table 4 Details of Coal Requirements S.No Particulars Details Remarks 1 Annual generation at 100% PLF 7008 MU Imported: 2 Annual generation at 85% PLF 5957 MU Foreign 3 Plant heat rate (approx) 2100 Kcal/Kwhr Countries(Indonesia) 4 G.C.V of Imported coal 6000 Kca;/kg 5 Handling & Transport losses 3% Table 5 Details of Coal Characteristics S. Details Units Foreign Indian 30: Indian 70: Indian No Foreign 70 Foreign 30 1 Coal consumption TPH 280 315 377 442 TPD 6720 7551 9040 10611 Million 2.09 2.35 2.812 3.3 TPA 2 Ash % 12 18.6 27.4 34 3 Sulphur % 0.80 0.73 0.63 0.55 4 Gross calorific value Kcal/kg 6000 5340 4460 3800 3.3 Water The main source of water for proposed power plant is sea water from Ennore Port Basin (Bay of Bengal). The existing cooling water channel of 2 x 600 MW NCTPS Stage is having the drawal capacity of 65 m3/sec. After the drawal of Cooling water for NCTPS stage II TPP (2x600 MW) and Ennore SEZ TPP (2x800 MW), around 10m3/sec is available. This balance quantity is proposed for the cooling water requirement of NCTPS stage III TPP. The cooling water system envisaged for the plant is re-circulating type system with natural draft cooling towers using sea water as make up water. Desalination plant will be established to obtain Raw water for the plant purposes.