# ADDENDUM NO.1 REQUEST FOR EXPRESSION OF INTEREST (REOI) SZ-ECC-561947-CS-CQS — CONSULTANCY SERVICES FOR A BATTERY ENERGY STORAGE SYSTEM (BESS) GRID INTEGRATION AND PLANNING STUDY

- **Reference:** SZ-ECC-561947-CS-CQS
- **Issuer:** [Eswatini Electricity Company](https://za.bidwunder.com/tenders/issuer/eswatini-electricity-company.md)
- **Type:** Expression of interest
- **Published:** 2026-08-06
- **Closing date:** 2028-09-03 11:00 SAST
- **Sectors:** [Other professional services](https://za.bidwunder.com/tenders/sector/M74.md)

## Summary

#### Overview
- **Eswatini Electricity Company is seeking Expressions of Interest from consulting firms to provide Consultancy Services for a Battery Energy Storage System (BESS) Grid Integration and Planning Study under the ASCENT Eswatini Project.** The REOI is issued to shortlist consultants for a subsequent technical/financial proposal under Consultant Qualification Selection (CQS). An Addendum extends the submission date to 03 September 2026. 

#### Requirements
- At least 10 years’ experience in grid planning, stability, storage or renewable integration studies.
- At least 5 relevant assignments in Africa.
- Demonstrated experience in at least one BESS integration assignment in Africa (including siting, sizing, grid impact analysis).
- Proven experience in FACTS devices analysis (e.g., STATCOM, SVC) for voltage control and stability in Africa.
- Experience with utility transmission networks.
- Submissions must include: incorporation/registration certificates; last 5 years’ annual financial records; corporate profile with QA plan (e.g., ISO 9001); evidence of licensed power system analysis software (PSS/E, DIgSILENT Power Factory, ETAP, PSCAD or equivalent).
- English language submissions; ability to form JV/consortia; lead partner to demonstrate substantial relevant experience; compliance with World Bank IPF procurement regulations and CQS methodology.

#### How to Apply
- Expression of interest must be delivered in writing by 11:00 SAST on 03 September 2026 to the Procurement Manager, ASCENT Eswatini Project, Eswatini Electricity Company, Eluvatsini House, Mbabane, with emails to bongani.chauke@eec.co.sz and thobeka.gama@eec.co.sz.
- Submit required documents (copies of incorporation, five years of financial records, corporate profile with QA, evidence of licensed analysis software) and references; documents must be in English.
- TORs and further details are accessible at the following link: Battery_Energy_Storage_System_BESS_Grid_Intergration_and_Planning_Study_TORs.pdf (see attached REOI document for full TORs).
- Consultants may associate via JV/consortium; Lead Partner must demonstrate substantial relevant experience. Evaluation follows the World Bank Consultant Qualification Selection (CQS) framework, with shortlisted firms invited to submit Technical and Financial Proposals.
- Inquiries may be directed to the contacts above.

## Description

ADDENDUM NO.1 REQUEST FOR EXPRESSION OF INTEREST (REOI) SZ-ECC-561947-CS-CQS — CONSULTANCY SERVICES FOR A BATTERY ENERGY STORAGE SYSTEM (BESS) GRID INTEGRATION AND PLANNING STUDY

## Documents

- REOI\_Consultancy\_Services\_for\_a\_Battery\_Energy\_Storage\_System\_(BESS)\_Grid\_Integration\_V01.pdf
- Tender Document

Documents download with a free BidWunder account.

## Published on

- [Eswatini Electricity Company Tenders](https://www.eec.co.sz/tenders/docs/REOI_Consultancy_Services_for_a_Battery_Energy_Storage_System_%28BESS%29_Grid_Integration_V01.pdf)
- [eSwatini ESPPRA Tenders](https://esppra.co.sz/sppra/tender.php)

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> Source: https://za.bidwunder.com/tenders/consultancy-services-for-a-battery-energy-storage-system-bess-grid-intergration-c5a86a57