26 Jan

Ohaji IPP ESIA 300MW Gas Power Plant; 32KM 330KV TRANSMISSION LINE





Background Information Document (BID)

This Background Information Document (BID) provides information to assist stakeholders to participate in the Environment and Social Impact Assessment (ESIA) and environmental authorization process for the proposed 300 MW Gas power plant and the Construction of 32KM 330KV Transmission Line Project at Ohaji/Egbema L.G.A of Imo State (The proposed project) by Waltersmith Ugamma Power Company Ltd (The Proponent)

 In compliance with administrative/statutory guidelines/provisions e.g Electricity Act, 1976, Electricity Amendment Act No. 28 of 1998, Electricity Power Sector Reform Act (2005): The Nigerian Electricity Regulatory Commission (NERC), World Health Organization (WHO) Health and Safety Components of EIA (1987) and Other National and International Regulations, Conventions and agreements to which Nigeria is a signatory or party, Waltersmith Ugamma Power Company Ltd has commissioned Richflood International to conduct an Environmental and Social Impact Assessment (ESIA) for the proposed project.

What is the ESIA About?

Basically, the ESIA is the process of identifying, predicting, evaluating and mitigating the physical, biological, social and other relevant effects of the proposed project prior to major decisions being taken and commitments made.

The Proponent intends to etablished a 300MW Gas (Thermal) and the construction of a 32km 330KV Transmission Line from Ibigwe Marginal Field to Owerri Transmission Station in Ohaji/Egbema Local Government Area of Imo State.

Waltersmith Ugamma Power Company Ltd, a subsidiary enterprise of WSPOL, WalterSmith Petroman Oil Limited (WSPOL) is a Nigeria registered E&P (Exploration & Production) Company and currently operates the OML-16 Ibigwe Marginal Field located in Imo State.


The Power Plant is located at Ochia autonomous community of Awara District, Ohaji/Egbema Local Government Area of Imo State. The Thermal Power Plant is located 100m from the operating OML-16 Ibigwe Gas Marginal Field, belonging to the project proponent, from whence the Project is proposed to source her fuel/energy-ingredient.

The ROW (Right-Of-Way) of the Transmission Line will cut across/transverse four (4) villages before terminating at the Owerri Municipal Station. The villages are:

  1. Umuakani,
  2. Obinze,
  3. Ihiagwa and
  4. Umuoma.

Figure 1: Plant Site Layout

Project Overview

  • Survey of the proposed project site
  • Clearing of the proposed project-site
  • Clearing of vegetation from essential parts of the 32km Right of Way (ROW) for the 330kV Transmission Line construction
  • Development of access road to the project site
  • Establishment of construction camp
  • Mobilization
  • Procurement and supply of all operational materials and machineries
  • Installation of the Power Plant


Establishement of the Gas Powered Electricity Plant

  • The power plant will utilize natural gas as its primary fuel, delivered to the site via a pipeline from the Ibigwe Marginal Field.
  • The natural gas will be piped directly to the system without intermittent storage.
  • The proposed Power Plant will be a combined Cycle Power Plant ( Gas Turbine (GT) and Steam Turbine (ST).
  • The total installed capacity of 300 MW that is planned to be implemented in phases. The initial capacity will be 40MW gas/steam open cycle unit.

 Gas Powered Plant – How it Works

  • This is how a combined-cycle plant works to produce electricity and captures waste heat from the gas turbine to increase efficiency and electrical output.
  • Gas turbine burns fuel.
  • The gas turbine compresses air and mixes it with fuel that is heated to a very high temperature. The hot air-fuel mixture moves through the gas turbine blades, making them spin.
  • The fast-spinning turbine drives a generator that converts a portion of the spinning energy into electricity.
  • Heat recovery system captures exhaust.
  • A Heat Recovery Steam Generator (HRSG) captures exhaust heat from the gas turbine that would otherwise escape through the exhaust stack.
  • The HRSG creates steam from the gas turbine exhaust heat and delivers it to the steam turbine.
  • Steam turbine delivers additional electricity.
    • The steam turbine sends its energy to the generator drive shaft, where it is converted into additional electricity.


Figure 2: Schematic of GT & ST Combined Cycle

Construction of 32km 330kV Transmission line

8.0Km of Transmission line will run on a new right of way (RoW) while the 24Km will run parallel to the existing Ahoada-Owerri 132kV transmisssion line.

  • Step 1: Survey of ROW and Land clearing
  • Step 2: Temporary access: Temporary access roads are used to build the line.
  • Step 3: Stockpiling: The various tower parts are manufactured and delivered by type.
  • Step 4: Delivery of steel: The steel parts needed for the placement of the foundations
  • Step 5: Establishing the foundations
  • Step 6: Tower assembly and erection:
  • Step 7: Conductor stringing:

Plate 1: Showing the foundation 

Figure 3 The red line is the proposed route and the green line is the existing transmissions lines of Ahoada-Owerri 132kV (OHTL-Over Head Transmission Line


  • Workshop/Store: There will be a workshop area where maintenance tools and equipment will be kept.
  • Administration Block: An administrative block will be located within the plant.
  • Fuel Storage Area: This area will consist of a diesel storage tank with a capacity of about 33,000ltrs placed on an elevated concrete wall.
  • Power Unit: The main source of power during the construction phase will from the Flow station.
  • Water Requirement: The water requirements for the project will be source from two boreholes drilled on site.
  • Construction of 100m 6” gas pipeline from Ibigwe Marginal Field to proposed gas plant
  • Construction of Natural gas treatment plant
  • Wastewater Treatment Plant
  • Natural Gas Treatment Plant
  • Metering Station Facilities:
  • Pressure reduction and metering system
  • Filter separators/gas scrubbers
  • Heaters/boiler system
  • Pressure regulating valves
  • Metering stream
  • Civil works for the station control room and pigging station
  • Testing and commissioning activities.


Figure 4: Natural Gas Treatment Plant


  1. Ensure   uninterrupted   power   supply, which   will   boost   commercial   and industrial activities in the country
  2. Promotion of Nigeria Industrilization
  3. Contribute to national power generation when excess power from the project is added to the national grid.
  4. Reduce Climate Change Dynamics with reduction of Gas Flaring
  5. Create employment opportunities for the people of the area.


  • Increase income base of the Local, State and Federal Government.
  • Creation of direct employment.
  • Capacity building for the employees.
  • Provision of economic and social linkage due to influx of people to the community.
  • Boost infrastructural/urban development of project location
  • Provision of socio amenities in respect to Cooperate Social Responsibility
  • Supply and distribution of Power for local industrial activities
  • Promote business development of the proponent.

Objectives of the ESIA

The objectives of the ESIA for the project site are to:

  • Provide information and evidence required for developing an Environmental Impact Statement for the project site;
  • Establish baseline information for the project site.
  • Identify associated/potential impacts of the project in the area;
  • Recommend preventive, mitigative and control measures for the identified potential/associated adverse impacts of the project; and
  • Develop an effective Environmental Management Plan (EMP) for the lifetime of the project.


The proposed project will result in various positive and negative interactions between planned activities and the environment. The scope of the ESIA includes gathering extensive baseline environmental data, identifying key stakeholders and stakeholder issues, assessing the potential impacts of the proposed project; proffering practical and cost-effective measures to mitigate identified negative impacts and enhance positive impacts, and development of workable Environmental Management Plan.

 Environmental Impact Indicators

The environmental impact indicators for the study are easily observable parameters that will indicate change/deviation, which can be used to monitor the various environmental components.

The primary Biophysical Indicators for the on-going impact assessment are the following:

  • Climate and meteorology;
  • Air quality;
  • Groundwater;
  • Geology and geomorphology;
  • Soils and soil erosion;
  • Drainage patterns and flooding;
  • Unique physical features; and
  • Vegetation including economic trees and crops.

The primary Socio-Economic Indicators for the on-going impact assessment are the following:

  • Land use;
  • Employment and income;
  • Community population and ethnicity;
  • Community relations; and
  • Services (e.g water and electricity supply).

Environmental issues:

All construction and operation activities that are likely to cause environmental and social impacts will be identified, and evaluated to assess their magnitude, duration, and potential receptors. The activities, which have the potential to cause impacts on surrounding environment and receptors during the Construction of the power plant, are identified as:

  • Site preparation;
  • Transportation of construction material, machinery, heavy machinery/ equipment for the power plant by road
  • Excavation of equipment foundations and installation of power plant components;
  • Laydown areas for temporary use during construction phase;
  • Storage and handling of hazardous materials, waste and wastewater; and
  • Accommodation and transportation for the construction workforce

 During the construction phase, contamination of soil, sediment and ground water may result from potential leaks and spills of oil, lubricants, or fuel from heavy equipment, dust and exhaust emissions, clearance of vegetation, improper handling of sanitary effluent, or chemical/fuel storage and sanitary and construction wastes.

Some of the social impacts due to the operations of the Project are: Employment Generation and In-Migration of Skilled workforce, Demand for lodging, housing and civic services, Increments in cost of living, Opportunity for local transporters and Risks of industrial accidents and fatalities to workers. The impacts as employment generation, demand lodging, housing and opportunity for local transporters would be positive where as other would be creating negligible impacts.

Baseline studies for the ESIA will include, but not be limited to assessment of the following:

  • Fauna and Flora;
  • Air quality and Noise;
  • Demographics, Population, Ethnicity; Language, Vulnerable Groups, Education
  • Socio-Cultural Institutions, Leadership Patterns, Government Administration, and Other Institutions (NGOs/CBOs);
  • Terrestrial Soils and Geology;
  • Surface and Ground Water;
  • Livelihoods and Micro-Economy, Key Livelihoods, and Employment;
  • Transport and Access;
  • Social Infrastructure and Cultural Sites; and
  • Community Health and Safety.

The ESIA process aims to identify all the potential impacts of the proposed project, assess the significance of the impacts, and to present measures to mitigate these impacts.

 Call for Participation

The stakeholder engagement process is designed to conform to the Nigerian EIA Decree and international standards, including the IFC Performance Standards. Key objectives for stakeholder engagement for this project are:

  1. Share information about the Project;
  2. Gather local knowledge to improve understanding of the environmental and social context and understand locally-important issues;
  3. Enable stakeholders to raise concerns / questions about the Project;
  4. Gather responses on the ESIA findings and incorporate stakeholder views into the design and management measures;
  5. Respond to concerns and questions and report back on the findings of the ESIA and proposed management measures;
  6. Lay foundation for future stakeholder engagement.

Anyone who is interested or affected by the proposed project has a right to participate in the ESIA process, and is invited to further participate in the ESIA Process. Please make use of the following opportunities to be involved in the stakeholder engagement process:

  • Study the information made available in this Background Information Document;
  • Contact the Stakeholder Engagement Team to obtain further project information, and/or raise issues and concerns (contact details provided below);
  • Attend the Stakeholder meetings to obtain further project information, interact with the Project Team, and/or raise issues and concerns. More information about the meetings will be circulated through letters, community leaders, radio announcements and through the project website.


Contact Information

Richflood International/Asokoro-Ogaji/info@richflood.com