Steam Production Data

In the mid-1980's, the University bond financed a biomass fired boiler to replace steam production capacity that had previously been supplied by a combination of coal fired boilers and natural gas boilers with diesel fuel back up. Sixty-three buildings on the main campus are currently connected to this system, which provides steam for space heating, domestic hot water, and for space and process cooling through absorption chillers. 

The University of Idaho is unique among universities in having a biomass-fired boiler to produce 90% of the steam needed. Waste wood is roughly one-third the cost of natural gas, saving the university over $1.5 million yearly.

Cedar chips, a by-product from local sawmills, are the main biomass fuel burned at UI. These local mills own their own timberlands, so the wood is a renewable, long term supply. Fuel payments to the mills stay in Idaho, adding to the tax base.

The plant exceeds all air emission requirements with simple pollution equipment.

As the CO2 produced by the wood boiler is from wood fuel that would have broken down naturally, either by decay or forest fire, it is not considered as an additional green house gas.

Water consumption at the steam plant has been reduced an average of 16% per year since 2000.

MONTHLY FUEL AND STEAM DATA FOR FISCAL YEAR 2007
Steam is produced at 150 psi, and distributed to campus at 60 psi.

Month

Steam by Wood
(1000s of pounds)

Cost
(per 1000 pounds)

Steam by Gas
(1000s of pounds)

Cost
(per 1000 pounds)

Total Steam
(1000s of pounds)

Cost
(per 1000 pounds)

 July

 17,396.4

$2.62

70

$12.27

17,466.4

$2.66

 August

 15,798.1

$2.59

0

N/A

15,798.1

$2.59

 September

 14,467.6

$3.08

572

$10.60

15,039.6

$3.36

 October

 19,064.7

$2.88

236.2

$18.69

19,300.9

$3.08

 

 November

 18,044.5

$3.02

6,606.8

$11.36

24,651.3

$5.26

 

 December

 22,027

$3.13

9,090.6

$10.08

31,117.6

$5.21

 

 January

 28,259

$2.93

7,150

$12.83

35,409

$4.93

 

 February

 26,592.4

$2.72

1,665.5

$13.39

28,257.9

$3.35

 

 March

 23,074.6

$2.42

2,623.9

$13.23

25,698.5

$3.53

 April

 16,999.4

$2.73

3,862.7

$13.30

20,862.1

$4.69

 May

 16,225.9

$2.49

543.3

$11.31

16,769.2

$2.78

 June

 17,491.2

$2.08

0

N/A

17,491.2

$2.08

 Total

 235,440.8

$2.73

32,421

$11.85

267,861.8

$3.84

Chip Storage Facility

Thousands of tons of wood chips are stored and dried at the Chip Storage Facility to increase burning efficiency. The University fuels its steam plant with wood chips that would otherwise go to waste

Utility Tunnel

The University has constructed thousands of feet of subterranean tunnels to carry utilities to the various buildings around campus