Your Complete Energy Supplier Guide
SmartestEnergy launched in 2001. It is wholly owned by Marubeni Corporation, a Fortune 500 Japanese company. SmartestEnergy Business an energy supplier aimed primarily at small and medium-sized business owners across the UK, but this supplier has recently branched out to cover large commercial organisations through its parent SmartestEnergy Limited, a brand that offers flexible tariffs to large businesses.
The SmartestEnergy brand has expanded its footprint to the U.S. Now, domestic energy consumers in New York, Pennsylvania, Ohio, Illinois, New Jersey, Maryland, Delaware, and New England rely on SmartestEnergy for their daily supply.
SmartestEnergy wants to make the transition to net zero as easy as possible, regardless of sector. Complete with over two decades of trading experience, this supplier promises personalised, realistic commercial energy agreements across various industries.
On top of that, SmartestEnergy is the UK’s leading purchaser of independently generated renewable electricity. Environmentally friendly consumers can opt for one of SmartestEnergy’s business electricity tariffs with 100% renewable energy.
Ultimately, SmartestEnergy promises unbiased advice, innovative retail solutions, and a roadmap to net zero. SmartestEnergy also offers incredibly competitive pricing through their tender offers for energy procurement in businesses.
SmartestEnergy claims to “champion greener, smarter energy for generations”, but what green initiatives and credentials does this energy supplier have?
To start with, the operations are backed by renewable credentials, including independent verification by the Carbon Trust. You can bet that each unit of SmartestEnergy business electricity you consume comes from natural sources including wind, solar, and hydro.
SmartestEnergy promises to match your consumption with renewable certificates. Even better, this energy supplier will send you an energy label each year so you can see how successful your carbon emission reduction efforts have been.
New customers also automatically take part in a Tree Planting Promise. In partnership with Ecologi, SmartestEnergy supports a global effort to plant native and diverse trees. When you switch to SmartestEnergy, this supplier funds the planting of 10 new trees in Madagascar, Mozambique, Kenya, and Nicaragua.
From 2022 to 2023, SmartestEnergy had a fuel mix of 74.5% renewable and 25.5% non-renewable energy, which shows how committed it is to reaching net zero.
But before you switch to SmartestEnergy, you need to explore the tariffs. We have included SmartestEnergy’s business energy services, designed to support small and medium-sized businesses.
True to its word, SmartestEnergy has created a tariff for business owners who want to reduce their carbon emissions and contribute to the UK’s net zero goal.
SmartFix 100% Renewable is SmartestEnergy’s version of a fixed-term contract. In essence, it protects business owners from fluctuations in the wholesale energy market. It’s unusual to find a supplier that offers a five-year fixed tariff, so you should snap this offer up while it’s still available.
Customers can even pay for SmartestEnergy’s business electricity via a monthly Budget Plan payment. If you sign up for a fixed Direct Debit, you can access savings and lessen your financial burden.
SmartTracker is a brilliant option for business owners who are on a budget.
For the first 12 months, you can access the cheapest SmartEnergy business gas or electricity prices. After the year has finished, your deal is reviewed and adjusted against current market prices.
According to the Price Promise Guarantee, SmartestEnergy will always match a cheaper deal. If you can show SmartestEnergy evidence of a cheaper tariff elsewhere, they will match it.
Lastly, you can control your cash with a Budget Plan Payment.
Overall, this tariff is ideal for first-time business owners who want to control their cash flow, but it only has a three-year fix, which can feel intimidating.
SmartPay is SmartestEnergy’s version of a variable tariff.
This variable rate tariff might be more affordable than you think. When you switch to SmartestEnergy’s SmartPay tariff, you will save up to 40% compared to the competition’s variable rate tariffs.
On top of that, you can control when you pay by topping up your credit online via SmartWeb, phone, or Direct Debit.
SmartPay is marketed toward hospitality or similar businesses with unpredictable cash flow, but any small or medium-sized business can benefit from a variable tariff that offers this kind of pre-payment schedule.
The Web Analyser Service gives customers an in-depth breakdown of their electricity consumption. New data becomes available every half an hour, meaning you can stay on top of your real-time usage.
You can also create daily, weekly, and monthly reports, analyse usage across meters and sites, and much more. If you want to understand your consumption on a deeper level, this is the supplier for you.
Before you switch from SmartestEnergy to a supplier that deals with large businesses, consider this supplier’s commercial and industrial supply service, SmartestEnergy Limited.
Despite launching exclusively for SMEs, SmartestEnergy has recently branched out to include larger commercial enterprises that want to meet the UK’s net zero goal. SmartestEnergy’s team has built long-standing relationships with energy consultants and brokers so that you can access personalised deals, support, and competitive prices.
As of now, over 2,900 large companies use SmartestEnergy’s services.
Let’s take a look at SmartestEnergy’s business energy prices.
Business electricity prices are a UK-average for a business using 25,000 kWh of business electricity annually in June 2025:
|
Contract Length |
Unit Rate |
Standing Charge |
Annual Cost (£) |
|---|---|---|---|
|
1-Year |
25.75p | 30.37p | £6,547.10 |
|
2-Years |
26.82p | 30.37p | £6,815.32 |
|
3-Years |
27.44p | 30.37p | £6,859.11 |
Business gas prices are a UK-average for a business using 25,000 kWh of business gas annually in June 2025:
|
Contract Length |
Unit Rate |
Standing Charge |
Annual Cost (£) |
|---|---|---|---|
|
1-Year |
6.24p | 144.30p | £2,085.54 |
|
2-Years |
6.23p | 144.30p | £2,085.16 |
|
3-Years |
6.21p | 144.30p | £1,551.54 |
Looking for realistic SmartestEnergy Business reviews? The best place to look is Trustpilot.
SmartestEnergy’s Trustpilot account has just over 3,497 reviews, a small amount for a company that has been active since 2001. Regardless, SmartestEnergy has 4.3/5 stars and an overall rating of 'Excellent'.
71% of customers think that SmartestEnergy Business deserves 5 stars, but 19% of customers think that the company deserves 1 star. Positive reviews talk about the kind, friendly customer service representatives, but the negative reviews say they struggle to contact SmartestEnergy Business.
Fortunately, SmartestEnergy Business replies to all the reviews. Even if you are disappointed to the point of leaving a SmartestEnergy Trustpilot review, a representative will help you resolve.
SmartestEnergy Business isn’t the only energy supplier out there. With our service, it has never been easier to find the best deal for your business. Our intelligent tool is packed full of information about every supplier and tariff on the market.
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