Julian Morgan, managing director of the business electricity price comparison and switching service, said energy bills had already more than doubled since 2004 and many firms would be pushed to the financial brink by the new measures.
His comments follow reports that the government is to allow energy firms to triple the amount they add to customers energy bills to pay for renewable power, nuclear and other green measures.
This means the total amount energy suppliers will be able to add to domestic and business electricity bills will rise from 2.35 billion this year to nearly 10 billion by 2020.
The business community is extremely worried by these measures, Mr Morgan said.
The government hasnt specified yet exactly how these increases will apply to the non-domestic sector but there is little doubt they will push up prices considerably, on top of price hikes in the actual cost of power.
The government needs to make sure that the most vulnerable firms are protected, those in the most energy-intensive industries, for example, and they need reassurance now to end the uncertainty and worry.
The measures are included in the governments Energy Reform Bill, which has just been agreed by the Coalition partners and will be presented to Parliament next week. The legislation is designed to pave the way for much needed investment in the energy sector and enable the UK to meet tough new environmental standards.
In principal we support the governments efforts to meet environmental goals, but not if its at the expense of small and medium-sized firms, which are the backbone of the UK economy, Mr Morgan said.
What businesses really want this bill to do is open up competition in the retail energy market to end the effective oligopoly of the Big Six.
This will enable other players to enter the market, leader to greater transparency about prices and billing, and hopefully lead to lower energy prices.
The Energy Advice Line is the only independent price comparison and switching service in the UK designed exclusively for businesses. Firms can view the five most competitive energy offers from the UKs leading suppliers online, compare prices against their renewal quotation and switch at the click of a button.
The Energy Advice Lines expert team can also offer advice on how to switch suppliers, as well as a renewal reminder service to ensure you do not get caught in an expensive business energy rollover contract.