Carbon County commissioners have approved $10 million in industrial revenue bonds to help finance a small electrical co-generation plant to be built at Sunnyside by Environmental Power Corp.

The $10 million in bonds will be added to $80 million approved for the company in late 1987, for a total of $90 million.Groundbreaking for the 45-megawatt electrical generating plant, which will burn waste coal, is scheduled for May 1, Ed Barton, project director, told the commissioners.

He said a total of 200 people will be employed at various times during the construction. About 35 are expected to be employed after the plant is operating.

The co-generation plant is designed to burn coal discarded by mining companies during the coal-washing process.

Environmental Power, which has headquarters in Boston and Western offices in Colorado Springs, owns 10 to 20 million tons of coal piles. The coal is considered waste, but is burnable.

The coal was piled up by Kaiser Coal Corp. during many years of mining operations. After being idle for several months, the mine now is being operated by Sunnyside Reclamation and Salvage Co.

With the mine back in operation, the co-generation plant will burn waste coal coming from daily operations, rather than the stockpiled coal, said Richard Fisher, Environmental Power's local construction representative.

But the stockpiles will be available if needed and it has been estimated they would last as long as 30 years.

Fisher said the plant qualifies as a co-generating plant because it will provide steam to Spring Gardens, a company that plans to build 12 acres of tomato greenhouses in Sunnyside.

Carbon County commissioners two weeks ago approved a $3 million industrial revenue bond for Spring Gardens.

Groundbreaking for Spring Gardens also is set for May 1.

Harbert International of Birmingham, Ala., will design and build the co-generation plant, Fisher said.

Fisher said negotiations are under way with Utah Power & Light Co. on prices for the power generated by Environmental Power. A meeting with the Public Service Commission is scheduled.