Diamond Energy Reviews 

420
TrustScore 2 out of 5

2.1

While we don't verify specific claims because reviewers' opinions are their own, we may label reviews as "Verified" when we can confirm a business interaction took place. Read more

To protect platform integrity, every review on our platform—verified or not—is screened by our 24/7 automated software. This technology is designed to identify and remove content that breaches our guidelines, including reviews that are not based on a genuine experience. We recognise we may not catch everything, and you can flag anything you think we may have missed. Read more

See what reviewers are saying

Rated 1 out of 5 stars

I was just after a reasonable electricity provider & I thought Diamond Energy was OK until I received today's notice of an increase of 65% in the supply charge. Yes, 65%! I have been a customer less t... See more

Rated 3 out of 5 stars

I have had to contact the company as my bill was excessive. the person was not really helpful telling me that I would have to have the meter reread at a cost of $89 I didnt want any extra expence so w... See more

Company replied

Rated 1 out of 5 stars

1 star is bad & had I been able to give no stars I'd have been more satisfied. I spoke with Veronica in an attempt to ascertain why my quarterly bill was over $500. This was twice the amount for the... See more

Company replied

Rated 3 out of 5 stars

I'm constantly frustrated when trying to understand my bill. I can't work out where or how the the different costs come from. I wonder if this complexity is a deliberate strategy to confuse consume... See more

Company replied

Company details

  1. Housing Utility Company
  2. Electric Utility Company
  3. Energy Supplier

Information provided by various external sources

Diamond Energy is an electricity retailer supporting renewable generation derived from Australia’s pure resources. We are an electricity retailer committed to helping you save energy and save on your bills, not just trying to sell you more electricity! As a generator and retailer, your support helps us continue to deliver more renewable energy to the grid.


Contact info

2.1

Poor

TrustScore 2 out of 5

420 reviews

5-star
4-star
3-star
2-star
1-star

No recent history of asking for reviews

This company hasn't invited customers recently, so reviews may not be representative

Hasn’t replied to negative reviews

How this company uses Trustpilot

See how their reviews and ratings are sourced, scored, and moderated.

2.1

All reviews

(420)

1 review in the last 12 months

Write a review
Companies on Trustpilot aren't allowed to offer incentives or pay to hide reviews. Reviews are the opinions of individual users and not of Trustpilot. Read more

Rated 1 out of 5 stars

As expensive as Diamonds

I was just after a reasonable electricity provider & I thought Diamond Energy was OK until I received today's notice of an increase of 65% in the supply charge. Yes, 65%! I have been a customer less than 6 months. Surprised the energy regulator allow such an usurious increase.

June 18, 2026
Unprompted review
Advertisement
Rated 5 out of 5 stars

Each time I haves contacted diamond…

Each time I haves contacted diamond energy I am amazed at the staff understanding of my issues. I have found them very polite and extremely helpful.

July 3, 2025
Unprompted review
Diamond Energy logo

Reply from Diamond Energy

Thank you so much Colin for taking the time to share your positive experience with us. We're truly grateful for your support and thrilled to hear that we met your expectations. Our team is dedicated to providing exceptional service, and your feedback lets us know we're on the right track. If you ever need assistance in the future, please don’t hesitate to call us on 1300 838 009, we’re always here to help.

Have a lovely day,
Angela - The Diamond Energy Team

Rated 1 out of 5 stars

Horrible

Horrible - they took over our electricity account without permission as they mixed us up with our neighbours. After receiving dodgey letters addressed "To the Home Owner" with threats to pay them, they clearly didn't have our personal details. They then turned off our electricity and admitted fault, but gave me a default on my credit report. 7 years later and a mark on my credit rating stopping me investing for 7 years! Finally, the debt came off my credit report and they have come back to threaten me again just this week with a debt collection agency. Still trying to get rid of Diamond Energy, a company I never signed up to or agreed to be with. No contracts exist between the two parties, yet I am punished for years. And the Statute of limitations for debt (which i should never have been given), ignored. Illegal SHAMS.

May 15, 2025
Unprompted review
Rated 5 out of 5 stars

Great customer service

Great customer service - Mark was very helpful (answered all queries clearly and proactively) and extremely prompt with follow-ups.

March 20, 2023
Unprompted review
Advertisement
Rated 5 out of 5 stars

What a great company!

We're finally with an energy provider that's competitive and passes on the savings when they can. I feel morally obligated to use renewables when it comes to my energy use, as should all people on this planet, Diamond Energy provides that and keeps it simple. Have recommended to my family and friends.

August 4, 2021
Unprompted review
Diamond Energy logo

Reply from Diamond Energy

Hi there,
Thank you for taking the time to share this lovely feedback, and for supporting us on our mission to generate change in the electricity industry! We love providing customers the option to support renewables every day. Please don't hesitate to contact us if there's anything further we can do to help.
Thanks again,
Grace

Rated 1 out of 5 stars

Please avoid

Very poor install causing damage . The reason for this review is the way that it was handled afterwards . Never return calls and seem not to care at all about fixing the issue

July 1, 2021
Unprompted review
Rated 5 out of 5 stars

Very professional and knowledgable

It's been a constant over the years whilst I have been a DE customer, its staff answering calls have been very professional, helpful and patient. I never seem to be in a queue or select 15 options to get through to someone! This is the first time I have provided feedback and am very happy to do so. They all seem enthusiastic and give the perception of being well educated (most sound sub-30!). They always sound like great advocates for the environment and doing the right thing. This enthused answering of calls matches the ethos of the enironmentally-aware energy company - the no.1 reason I have my electricity supply through DE

February 24, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi Eric,

Thank you for your kind words. We take immense pride in our customer service, so it's wonderful when our customers notice! We love supporting environmentally focused customers such as yourself, and are so pleased you are on board with our renewable energy mission. Please let us know if there's anything else we can do to help.

Thanks again,
Ashleigh

Rated 5 out of 5 stars

It was a pleasure to talk to Talia

It was a pleasure to talk to Talia. She was polite and very efficient in handling my situation and very understanding. Such people are an asset to the company they work for.

February 11, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi Harshad,

Thank you so much for your kind review. We are so glad to hear that you've had a great experience with Tahlia, your feedback means a lot! If there is anything else we can do to assist you, please don't hesitate to get back in touch with our team.

Warm Regards,
Alex

Advertisement
Rated 5 out of 5 stars

I'm a long time customer with Diamond…

I'm a long time customer with Diamond Energy. I like to support renewable energy and support companies who work in that direction of creating a sustainable future.
The products at Diamond Energy are very competitive and the customer service is always great, fast and uncomplicated. They also support you in choosing the right product and tariff for your circumstances. I also like their referral program which gives me long term and ongoing discounts on their products.

February 9, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi Andy!

Wow - what a wonderful review! Thank you so much for taking the time out of your day to provide such lovely feedback, we are so pleased to hear that you have had a great experience with our customer service team and are on-board with our renewable energy mission! If there is any way we can further assist you with your electricity bills, please don't hesitate to reach out and contact us!

Warm Regards,
Alex

Rated 5 out of 5 stars

Thankyou for your clear explanation of my issue

Minnie helped me understand why my bill was $100 dearer and she also emailed me an article about how to get the most out of my solar panels
Thanks Minnie....Anne from Caloundra

February 7, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi Anne,

We are so glad to hear that you had a great experience with Minnie! Just wanted to reply and say a big thank you for your ongoing support. If there is anything else we can do to support you please don't hesitate to contact our team.

Warm Regards,
Alex

Rated 5 out of 5 stars

The green ‘charge’

I am now clear on one ‘charge’ - the green additional charge. We never needed to pay it. !
I thought it was required for 100% renewable supply, but it is more of a voluntary donation in favour of renewables.

February 4, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi John,

Thank you for your review! I am glad that you had a pleasant experience with our team and are benefiting from our competitive rates. Supporting renewables doesn't have to cost you more!

Warm Regards,
Alex

Rated 5 out of 5 stars

A joy to do biz with

February 2, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi Rob,

Thank you so much for your review and ongoing support - it's a pleasure doing business with you! If there is anything else we can do to support you further, please don't hesitate to reach out.

Warm Regards,
Alex

Advertisement
Rated 5 out of 5 stars

Diamond Energy stand out from the pack

Diamond Energy is one of very few utilities vendors I have praised publicly and recommended privately. Great service from real people who are helpful and informed is a key part of this. Social and environmental awareness seems to genuinely undergird the business. I recommend Diamond Energy. They stand out from the pack of profit focussed providers.

January 24, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi John,

We really appreciate you taking time out of your day to leave us such a raving review! It is so great to hear that you have had a wonderful experience with our team and we are very pleased to have you as a part of our Diamond family! If there is anything we can do to support you further, please reach out.

Warm Regards,
Alex

Rated 5 out of 5 stars

Best provider in the marketplace

Best provider in the marketplace. Only thing wrong is that they are unavailable to service Boyne Island. very sad!!!!!!

January 12, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi Paul,

Thank you so much for your generous review! We absolutely love looking after passionate customers such as yourself and it is a real shame that we cannot support you at your new property. If you ever do move back into the Energex distribution zone, please be sure to give us a call! Wishing you all the best in your future endeavours.

Warm Regards,
Alex

Rated 5 out of 5 stars

Energy Supplier

I have now been with Diamond Energy for 6 years. I have always been happy with their feed-in credit, even though it has dropped by 2c, but the discounts I receive make up for that. They have always been very helpful and responsive when I have rung with issues. I say "go away" (not so politely) when those pesky various call centres ring.

January 7, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi Lyn,

We really appreciate you taking the time to leave us such a kind review, it is so lovely to hear that you have had a great experience with our friendly team! Just wanted to reply back and say a huge thank you for your ongoing support. If there is any way we can further assist you with your electricity bills, please don't hesitate to reach out and contact us!

Warm Regards,
Alex

Rated 5 out of 5 stars

Stellar service and green energy options

I spoke to a very helpful, patient local person. The call was answered by a human within 15 seconds of ringing and receive immediate solution. This attentive human touch is a strong competitive advantage to others. Keep it up. I also love that Diamond Energy provides upto 100% green energy option. This is much needed to help our climate. Will continue the support.

January 5, 2021
Diamond Energy logo

Reply from Diamond Energy

Hi Wiki,

We are delighted to hear that you have had a great experience with my colleague Maddy and we are very pleased to have you as a part of our Diamond family! If there is anything else we can do to assist please let us know, and thank you so much for your continued support!

Warm Regards,
Alex

Advertisement
Rated 4 out of 5 stars

Thank You

Thank You, I am happy with the service you have been providing since I signed up many years ago.

December 30, 2020
Diamond Energy logo

Reply from Diamond Energy

Hi Graham,

Thank you for taking the time to leave us a review! We love looking after long term customers such as yourself. If we can do anything else to support you please don't hesitate to contact our friendly team!

Warm Regards,
Alex

Rated 5 out of 5 stars

Answered my call quickly

Answered my call quickly, and friendly intelligent service - as always

December 24, 2020
Diamond Energy logo

Reply from Diamond Energy

Hi Susan,

Thank you for your review! We are so glad to hear that you've had a pleasant experience with our Australian based team. If we can do anything else to help please don't hesitate to get in touch with us!

Warm Regards,
Alex

Rated 5 out of 5 stars

Diamond is always friendly

Diamond is always friendly, efficient and helpful.

December 10, 2020
Diamond Energy logo

Reply from Diamond Energy

Hello Allan,

Thank you for taking the time out of your day to leave us such a nice review - it's great to have you on board! If there is any way we can assist or support you further, please don't hesitate to reach out to us.

Warm Regards,
Alex

The Trustpilot Experience

Anyone can write a Trustpilot review. People who write reviews have ownership to edit or delete them at any time, and they’ll be displayed as long as an account is active.

We use dedicated people and clever technology to safeguard our platform. Find out how we combat fake reviews.

Learn about Trustpilot’s review process.

Here are 8 tips for writing great reviews.

Verification can help ensure real people are writing the reviews you read on Trustpilot.

Offering incentives for reviews or asking for them selectively can bias the TrustScore, which goes against our guidelines.

Take a closer look