Expanding the use of combined heat and power (CHP) to produce electricity could, under one scenario, boost natural gas demand in the United States by as much as 4.42 Tcf/year, according to a report commissioned by the American Gas Association (AGA).
In an 84-page report, consulting firm ICF International focused exclusively on CHP, or cogeneration, systems below 100 MW capacity, reasoning that such systems were more likely to be connected to a utility that supplies natural gas. The CHP systems studied were at industrial, commercial, institutional and multi-family residential sites, and collectively account for about 95% of total technical potential.
“It’s an additional growth opportunity for the industry, to utilize the shale resources, as well as natural gas resources in general, more effectively to deliver electric and thermal needs for commercial and industrial customers,” AGA’s Rick Murphy, managing director for sustainable growth, told NGI.
ICF said 82,000 MW of CHP capacity is in use at more than 4,100 sites in the United States, with 71% of the capacity fueled by natural gas. That equates to approximately 4.5 Tcf of annual consumption, or about 18% of annual natural gas demand in the U.S. Simple paybacks were calculated on a state-by-state basis and divided into three types for the report, based on their degree of economic potential. States with a “strong payback potential” were those able to make a simple payback in less than five years, while “moderate” and “minimal” states were classified as those with paybacks between five and 10 years, and more than 10 years, respectively.
Under a base case scenario using current state electricity and natural gas prices, equipment costs and performance, ICF found the small CHP systems it studied had a total technical potential of 123,303 MW. Among the 12 states with “strong payback potential” (Alaska, California, Connecticut, Florida, Hawaii, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island, Texas and Vermont) the technical potential was 6,355 MW, or 5.2% of the total.
Meanwhile, the technical potential for 36 “moderate payback potential” states was 35,257 MW (28.6% of total), and the technical potential among 46 “minimal payback potential” states, which included the District of Columbia, was 81,691 MW (66.3%). Most states were listed under more than one payback category. ICF then created three scenarios, the first of which modeled a 25% reduction in CHP capital expenditure (capex) or equipment costs from the base case. If that happened, the strong payback potential would increase to 16,647 MW, and seven states (Louisiana, Tennessee, Georgia, Maryland, Alabama, Mississippi and Delaware) would be added to that category.
A second scenario envisioned a 15% increase in average electricity prices, something ICF said was possible with coal plant closings and investment in transmission and distribution projects in key parts of the U.S. Under this scenario, strong potential payback would increase to 17,419 MW and Nebraska would be added to the category. A third scenario was modeled after a 10% decrease in natural gas prices, something possible with additional supplies in North America, the strong payback potential would increase to 8,694 MW.
ICF found natural gas consumption would vary widely among the base case and the three scenarios it created for the AGA report. Under the base case scenario, an additional 2.96 Tcf/year of natural gas would need to be added to the 4.5 Tcf/year currently being used for CHP. Consequently, the thermal heat captured off CHP units could displace 1.79 Tcf/year of incremental gas use, or existing thermal heat generated by a natural gas boiler.
“This analysis assumed that all of that waste heat was displacing thermal heat that is currently being produced by natural gas boilers, so the net amount would be 1.79 Tcf,” Murphy said. “That’s the value of CHP — it’s actually capturing heat that is otherwise wasted in traditional electric generation and is using it to satisfy thermal energy or heat needs within the facility.”
Gas consumption and savings were even more apparent under the three scenarios posed by ICF. Under the first scenario (a 25% reduction in CHP capex), 3.83 Tcf/year of natural gas would be needed above the 4.5 Tcf/year used currently, and thermal heat would displace 2.31 Tcf/year of incremental gas use. For the second scenario (a 15% increase in average electricity prices), 4.42 Tcf/year would be needed above the current 4.5 Tcf/year, with thermal heat displacing 2.66 Tcf/year of incremental gas use. Under the third scenario (a 10% decrease in natural gas prices), another 3.32 Tcf/year would be needed above the base 4.5 Tcf/year, which would displace 1.99 Tcf/year of incremental gas use.
ICF said the natural gas industry, and utilities in particular, “could serve to reduce project risks, increase market acceptance, and promote the deployment of efficient cost-effective CHP.” Such a strategy should include educating customers, especially commercial and institutional ones, because “lack of awareness of CHP and the savings it can provide…continues to be a significant barrier to CHP development.” Utilities could also provide low-cost financing or leasing of CHP equipment, and could create an advocacy group that would lobby at the state and federal level for policies that would encourage CHP adoption.
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