Diamond Energy — Plans & Profile

Last updated: 4 July 2026 · Rates sourced from CDR energy plan data. Updated daily by Bill Hero.

Retailer at a glance

11,724 residential customers (0.2% market share)Complaints: better than average (0.26% of customers)Founded: 2004

About Diamond Energy

Diamond Energy is a Melbourne-based independent electricity retailer founded in 2004. It consistently earns 5-star ratings in Greenpeace's Green Electricity Guide and has placed first in CHOICE's Best Electricity Provider rankings. Diamond sources more renewable energy than its customers consume (beyond carbon neutral) and offers accredited GreenPower options via its Diamond Pure Plus plans with competitive solar feed-in tariffs. Its base rates are typically higher than the cheapest market offers. Diamond operates in VIC, NSW, SA, and QLD.

Bill Hero is an independent comparison service: we list every retailer that publishes pricing through CDR, and we don't take placement fees from Diamond Energy or any other retailer. Rates below are sourced from CDR and refreshed daily.

Provider Profile

Customer Count (Energy)

11,724

0.2% market share

As of 2026

Founded

2004

Complaints Rate

0.26%

Fewer complaints than 57% of retailers

Q2: Good

Source: AER Retail energy market performance update for January to March 2026, Quarter 3 2025–26

Australian Ownership

partial

Diamond Energy is an Australian private company owned by its management team and small investors, with a minority stake (approximately 42 percent) held by SunPower Corporation, a NASDAQ-listed US solar panel manufacturer (majority-owned by TotalEnergies SE of France). The company remains Australian-operated from its Melbourne base.

Generation Assets

Owns renewable generation plants in northern Victoria. Additionally purchases power from third-party renewable generators (e.g. Starfish Hill Wind Farm SA) and aggregates rooftop solar exports from thousands of customers nationwide.

GreenPower

Yes — accredited

Reputation Scores

ProductReview

★★★★☆

4.1

119 reviews

Trustpilot

No data

Google

No data

Customer Reviews (0)

No reviews yet. Be the first.

Energy Plans

Electricity Plans (175)

Filter:

Plan	Retailer	Flat ratec/kWh	Time of use c/kWh			Supplyc/day	Solar FITc/kWh	Annual cost ▲at 4,000 kWh/yr
			Peak	Off-peak	Shoulder
Diamond Everyday Flat rate	Diamond Energy	22.73	—	—	—	103.03	3.0	$1,285	Switch
Diamond Everyday with CL Flat rate	Diamond Energy	22.73	—	—	—	103.03	3.0	$1,285	Switch
Diamond Everyday - T52 Time of useBusiness	Diamond Energy	—	29.60	17.43	—	129.53	3.0	$1,316	Switch
Diamond Everyday - T72 CL Time of use	Diamond Energy	—	33.00	18.75	—	111.05	3.0	$1,326	Switch
Diamond Everyday - T72 Time of use	Diamond Energy	—	33.00	18.75	—	111.05	3.0	$1,326	Switch
Diamond Everyday - T52 Time of useBusiness	Diamond Energy	—	31.35	18.15	—	122.72	3.0	$1,332	Switch
Diamond Everyday - T72 Time of use	Diamond Energy	—	34.00	20.56	—	100.00	3.0	$1,349	Switch
Diamond Everyday - T72 CL Time of use	Diamond Energy	—	34.00	20.56	—	100.00	3.0	$1,349	Switch
Diamond Everyday - T72 CL Time of use	Diamond Energy	—	33.90	21.00	—	104.95	3.0	$1,378	Switch
Diamond Everyday - T72 Time of use	Diamond Energy	—	33.90	21.00	—	104.95	3.0	$1,378	Switch

Showing 10 of 10 plans. Click column headers to sort.

Frequently Asked Questions

How many plans does Diamond Energy offer?▾

Diamond Energy offers 175 plans in Australia (175 electricity, 0 gas), based on Consumer Data Right (CDR) data updated daily by Bill Hero.

Does Diamond Energy offer both electricity and gas?▾

Diamond Energy currently offers electricity only — 175 plans are listed in CDR data. Bill Hero does not have any gas plans on file from this retailer.

What is the cheapest Diamond Energy electricity plan?▾

Diamond Everyday is the cheapest Diamond Energy residential electricity plan in Bill Hero's comparison, with an estimated annual cost of $1,285 at 4,000 kWh/year. Your actual cost depends on your usage and tariff — see the table above for the full list.

Is Diamond Energy a major or smaller retailer?▾

Diamond Energy is a smaller-scale retailer in Bill Hero's comparison, with 175 plans on offer. Smaller retailers often compete on price or service rather than breadth of plan options.

How often is Diamond Energy's plan data updated?▾

Bill Hero refreshes Diamond Energy's plan data daily from the Consumer Data Right (CDR) energy API. Pricing on this page reflects the latest published rates from Diamond Energy.

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