Frequently asked questions

Honest answers to the questions clients ask first.

If you don't see your question here, email inquiries@avexgrid.com or book a free scoping call. We'd rather answer once than have you read three pages of marketing.

01 Energy audits & NEEP 2025

The questions intensive-energy users ask.

What does a NEEP 2025-compliant energy audit actually cost?

For a single industrial site under 10 MW peak demand, expect USD 8,000–18,000 depending on whether you want a walkthrough audit (lower bound) or an investment-grade audit with full M&V (upper bound). Multi-site portfolios get a discount. We quote fixed fees after a free scoping call — no hourly surprises.

How long does a full audit take?

A walkthrough audit: 2–3 weeks from kick-off to draft report. An investment-grade audit with bottom-up engineering: 6–10 weeks. The bottleneck is rarely the engineering — it's usually waiting for 12 months of historic ZESA bills and meter data from the client.

Are you accredited to lodge audits with ZERA?

Yes. AVEX GRID is a ZERA-registered electrical consulting practice. Our reports satisfy the NEEP 2025 industrial-user reporting requirements. We do not, however, certify ourselves — we cite the standard (IPMVP, ISO 50001-compliant where requested) and the audit is reviewed by ZERA, which we facilitate on your behalf.

Do you do the implementation too, or just the report?

We do not install hardware, run electrical contracting crews, or take supplier rebates. We do, however, stay engaged through Phase 05 (Implementation) as an owner's engineer — reviewing tenders, attending FAT/SAT, and signing off on commissioning. Implementation contractors are bid through a separate tender we help you run.

02 Captive solar & IPP registration

Becoming your own power supplier.

Is captive solar still a good idea after the 2026 own-consumption regulations?

For most industrial operators on ZETDC supply paying USD 0.16+/kWh: yes. The 2026 Own-Consumption Licensing Regulations clarified the path rather than blocking it. For sites under 1 MW the path is simple registration; above 1 MW you need a ZERA licence and a grid-impact study. We model both scenarios in the feasibility pack.

How big does my plant need to be to make captive solar worth it?

The economic floor depends on your tariff, not your size. A site with 200 kVA contracted capacity and a USD 0.18/kWh average tariff often beats the LCOE of a captive PV plant within 6 years. We run the LCOE / IRR / NPV / DSCR on your actual bill data — not on industry averages.

What's a bankable feasibility study, and why does my bank want one?

A bankable feasibility study is a report whose technical, financial, and risk sections have been written to survive lender due-diligence. AfDB, IDC, World Bank and most commercial banks won't fund a captive-solar or IPP project without one. We write it to the format DFIs actually use — P50/P90 yield, sensitivity analysis, DSCR coverage, technical risk register.

Can I sell excess captive solar back to ZETDC?

Under SI 86 of 2018 (Net Metering) and the 2024 Wheeling Framework: yes, with conditions. We help you architect the PPA, the wheeling agreement, and the metering arrangement. This is a strategic-advisory engagement, not a pure technical study.

03 Power quality & ETAP studies

The technical work.

My VFDs keep failing inside warranty. Can you prove it's the supply, not me?

Yes — that's a power-quality forensic engagement. We instrument the incoming supply with a Class A PQ analyser, log to IEC 61000-4-30, and compare against IEEE 519 harmonic limits and the IEC 61000-4-7 measurement protocol. The report stands up in a supplier dispute, in court, and at insurance arbitration.

What ETAP studies do you actually run?

Load flow (IEC 60909), short-circuit, protection coordination, arc-flash (IEEE 1584), motor starting, harmonic load flow, transient stability, and reliability. We use ETAP 22 and have done so since 2021. See the Electrical Calculations page for the full menu and sample report.

Will your protection-coordination study work with my existing relays?

In 90% of cases, yes — most settings problems are software, not hardware. We model your as-built switchgear, recommend new settings, and supply commissioning sheets. If your relays need replacing, we tell you and recommend tender specs. We don't sell relays.

Can you produce an arc-flash report ZIM-OSHA / ZWS will accept?

Yes. Our arc-flash deliverable cites IEEE 1584-2018, includes incident-energy calculations, PPE categories, and ZWS-compliant warning labels printed to spec. Stamped by a ZIE Graduate Member registered consultant.

04 Engagement & logistics

Working with AVEX GRID.

Where are you based and how far do you travel?

Our practice is registered at Autherstone Street 21, Marondera. We routinely visit sites across Harare, Bulawayo, Chegutu, Mutare, Kwekwe, Zvishavane, Marondera and the Lowveld. Beyond Zimbabwe, we take remote modelling work on a case-by-case basis.

Do you sign NDAs?

Yes, as standard. We use a one-page mutual NDA but will sign yours instead if you prefer. We do not name clients in marketing material without written permission.

What's your payment structure?

For fixed-scope projects: 40% kick-off, 40% draft report, 20% on acceptance. For retainers: quarterly in advance. For T&M: monthly against timesheets. USD, ZWL, or ZiG accepted; ZWL/ZiG quotes are pegged to RBZ midrate on the day of invoice.

What if I'm unhappy with the deliverable?

You don't pay the final tranche until you've accepted the report. We will revise once at no extra cost; further revisions are scoped as Phase 04 extension. We've never had a client refuse the final tranche, but the contract gives you that right.

Question not answered?

Book a free 30-minute scoping call. No hard sell — if your question is a 5-minute answer, we'll just answer it.