Mercury Energy Customer Service: Phone, Hours & Email

Few things feel more urgent than losing power and needing to reach your electricity provider — fast. If you’re a Mercury Energy customer in New Zealand, finding the right phone number, support hours, or email address shouldn’t require a second outage. This guide has the verified contact channels, the 0800 numbers that actually work, and a look at how the company evolved from Mighty River Power into one of NZ’s largest digital-first retailers.

Customer service phone: 0800 10 18 10 ·
Standard support hours: Mon–Fri 8am–6pm, Thu 9am–5pm ·
Fault reporting: 24/7 ·
Former name: Mighty River Power ·
Ownership: Listed on NZX

Here is the core pattern: the same 0800 number handles both general support and emergencies, while escalations follow separate paths for electricity versus telecom disputes.

How do I contact Mercury support?

Phone

For general enquiries and support, call 0800 10 18 10 — a New Zealand-based team picks up the line. According to Powerswitch NZ (independent energy comparison site), this number works for billing questions, account changes, and requesting half-hourly power usage reads. Faults are handled on the same number, 24 hours a day.

If you’re looking to join Mercury or add a service like gas or broadband, dial 0800 369 845 instead. The join team operates during standard business hours.

Email

Mercury does not publish a direct email address for general customer service inquiries. Instead, the company directs customers to the online contact form on mercury.co.nz for non-urgent requests. For complaints specifically, you can email complaints@mercury.co.nz directly, per Powerswitch NZ.

Live Chat

Mercury offers a chatbot on its website for quick questions — account balances, payment due dates, and basic troubleshooting. According to Powerswitch NZ, the chatbot is available during standard support hours. For more complex issues, the system transfers you to a human agent or recommends a phone call.

Online Form

The Mercury contact page hosts a form for general enquiries, account changes, and service requests. It’s the recommended channel for non-urgent matters. Response time varies, but the company typically replies within 1–2 business days, according to user reports on Geekzone forums (NZ tech community).

The implication: Mercury has shifted toward digital-first support — chat and forms replace phone queues for routine tasks, while phone lines are reserved for complex issues and emergencies.

What is the new name for Mercury Energy?

History of Mighty River Power

Mercury Energy was originally Mighty River Power, a state-owned electricity generator and retailer created from the breakup of the former Electricity Corporation of New Zealand. The company was listed on the NZX in 2013 as part of the government’s partial privatisation programme, according to Powerswitch NZ. It operated under the Mighty River Power brand until the early 2010s.

Rebranding to Mercury

The rebrand to Mercury was completed around 2014, unifying the company’s retail name with its existing generation brand (Mercury Energy operates hydro and geothermal plants on the Waikato River and in the Taupo Volcanic Zone). Today, Mercury is one of New Zealand’s largest electricity and gas retailers, serving over 600,000 customers.

The pattern: Mercury’s rebrand wasn’t cosmetic — it marked a shift from a government-owned generator to a publicly traded retailer with digital-first ambitions.

What is the email address for Mercury?

Support email

As noted, Mercury does not publish a direct general email address on its website. The only email address listed on its official pages is complaints@mercury.co.nz, verified by Powerswitch NZ. For billing, account changes, or technical support, customers must use the online contact form or call.

Contact form

The Mercury contact form asks for your account number, name, and a description of the issue. It’s the primary non-phone channel for general inquiries. If you need a written record of your correspondence, take a screenshot of your submission — Mercury does not auto-forward a copy.

The trade-off: Mercury gains efficiency by reducing email volume, but customers lose the ability to track a conversation thread in their inbox. For anything that requires a paper trail, use the complaints email.

What is the Mercury Energy customer service phone number?

General enquiries

The main customer service phone number for Mercury NZ is 0800 10 18 10. This is the line for billing, account changes, energy usage queries, and technical support. The team is based in New Zealand and operates during standard business hours: Monday to Friday, 8am–6pm, with a late start at 9am on Thursdays.

Fault reporting

Power outages and energy faults use the same number — 0800 10 18 10 — but with one critical difference: it’s available 24/7. Mercury’s official support page at Mercury NZ official (consumer care page) confirms that fault calls are answered at any hour, any day.

Join Mercury

New customers or existing customers adding a service can call 0800 369 845. This line is specifically for sign-ups, moves, and adding gas or broadband to an existing account, per Powerswitch NZ.

The trade-off: Mercury keeps it simple — one number for everything. But simplicity means you’ll wait on the same line whether you’re reporting an outage or asking about your bill.

What are the Mercury Energy contact hours?

Regular hours

• Monday, Tuesday, Wednesday, Friday: 8am–6pm
• Thursday: 9am–5pm

These hours apply to general enquiries, billing, live chat, and account changes. According to Powerswitch NZ, the later Thursday start is a team training slot.

24/7 fault support

Energy faults and power outages are handled around the clock on 0800 10 18 10. The same Mercury NZ consumer care page states that the fault team operates 24 hours a day, 7 days a week — no exceptions.

The implication: Thursday is the worst day to call for non-urgent matters. If you need help on a Thursday afternoon, you lose one hour of phone availability compared to the rest of the week.

Steps to resolve a Mercury Energy issue

1. Check the app or My Account first. Many issues — meter readings, payment due dates, usage history — are available online without calling. Daily usage summaries go back 12 months; monthly summaries go back 24 months, per Powerswitch NZ.
2. Use live chat for quick questions. The chatbot handles balance checks, payment confirmations, and basic troubleshooting.
3. Call 0800 10 18 10 during business hours for billing, account changes, or complex issues.
4. For faults, call the same number anytime. The fault line is 24/7.
5. If unresolved, email complaints@mercury.co.nz with your account number and a description of the issue.
6. Escalate to Utilities Disputes Limited if Mercury doesn’t resolve your electricity or gas complaint within 20 working days. Call 0800 22 33 40 or visit udl.co.nz, as directed by Mercury NZ official page.
7. For telecom disputes (phone or internet with Mercury), contact TDR at 0508 98 98 98 or tdr.org.nz.
8. Need financial help? MoneyTalks (0800 345 123) provides free financial advice for utility-related money worries, per the same Mercury support page.

Frequently asked questions

For New Zealanders trying to reach Mercury Energy, the choice is clear: use the app for routine tasks, call 0800 10 18 10 for faults anytime, and escalate to Utilities Disputes if Mercury’s own process leaves you stuck.