EPA greenhouse gas reporting and emission rates

The U.S. Environmental Protection Agency (EPA) has issued a rule creating a mandatory national greenhouse gas reporting (GHG) program. Regulated natural gas utilities and some of their largest customers are required to report GHG emissions. The EPA website includes an online tool to help you decide if the rule applies to your company. There are also resources to help your company understand the rule.

Electric utility energy mix and emission rates

This electric energy mix and emission rate information is provided for retail electric customers of Wisconsin Public Service Corporation (WPS), a regulated utility subsidiary of WEC Energy Group (WEC) operating in the state of Wisconsin. The emission rates are supplied for customers to estimate their environmental footprint from electric energy supplied by WPS, such as Scope 2 (indirect) greenhouse gas emissions.

Emission rates are calculated using total emissions and megawatt-hours from generation by owned and jointly-owned facilities, and from long-term power purchase agreements (PPAs). The emission rates apply to retail electric utility customers of WPS, except for customers of NatureWise®, WPS’s renewable energy program that is offered to all retail electric customers.

Emissions from electric generation facilities are calculated in accordance with the U.S. Environmental Protection Agency mandatory Greenhouse Gas Reporting Program regulations under 40 CFR Part 98. The energy resource mix represents net generation from WPS-owned facilities as well as generation acquired through long-term power purchase agreements.

WEC and WPS reserve the right to use all or some of the environmental attributes associated with generation from renewable energy sources in future years to comply with renewable energy standards or other regulatory requirements, or to sell to third parties the environmental attributes such as renewable energy credits, offsets, allowances and the avoided emissions of greenhouse gases. All information is provided on a voluntary basis, could be subject to change, and has not received independent third party verification. Neither WEC nor WPS makes any assurances regarding the use of this information by external parties for marketing or other sustainability claims.

Wisconsin Public Service energy mix and emissions1

  2018 2019 2020
Emission rates: Owned generation + long-term PPAs (lbs/megawatt-hour)
Carbon dioxide (CO2) 1,438 1,282 1,256
Methane (CH4) 0.022 0.020 0.019
Nitrous oxide (N2O) 0.025 0.020 0.018
Carbon dioxide equivalent (CO2e) 1,446 1,288 1,262
Sulfur dioxide (SO2) 0.53 0.18 0.17
Nitrogen oxides (NOx) 0.53 0.35 0.34
Energy resource mix: Owned generation + long-term PPAs
Energy from owned generation + long-term PPAs (megawatt-hours) 12,043,273 10,922,744 10,869,076
Coal 54.5% 47.5% 44.5%
Natural gas 34.9% 41.4% 43.1%
Renewable energy 10.6% 11.1% 12.4%
Hydroelectric 7.3% 7.5% 8.8%
Wind 3.3% 3.6% 3.4%
Solar 0.0% 0.0% 0.2%
CO2-equivalent emission rate: Owned generation + net purchases/sales to meet customer load (lbs CO2e/megawatt-hour)
Owned generation + net purchases/sales to meet customer load (megawatt-hours) 13,652,308 13,355,626 13,087,052
Carbon dioxide equivalent (CO2e2) (lbs/megawatt-hour3) 1,548 1,427 1,257

1 Table includes data for long-term power purchases that were not included in previously available emissions data.

2 Global warming potentials for calculating CO2-equivalents: CO2 = 1; CH4 = 25; N2O = 298

3 Regional average CO2 emissions in pounds per megawatt-hour, used to estimate CO2 from market energy purchases for CO2-equivalent emission rates, are provided by the Michigan Public Service Commission.

Information about the natural gas delivered by WPS

If your company is required to report, you may need information about natural gas purchased from WPS. The amount of natural gas consumed can be found on your WPS bill or in the My Account section of the website. As a service to customers, we provide the heating value of your natural gas below*.

Higher Heating Value (HHV) - (MMBtu/Mscf)
  2014 2015 2016 2017 2018 2019 2020 2021
Jan 1.027 1.040 1.050 1.036 1.037 1.043 1.047 1.040
Feb 1.030 1.040 1.054 1.036 1.034 1.042 1.047 1.049
Mar 1.033 1.041 1.045 1.033 1.040 1.048 1.044 1.044
Apr 1.031 1.038 1.043 1.026 1.037 1.045 1.050 1.047
May 1.034 1.037 1.034 1.032 1.035 1.043 1.045 1.048
Jun 1.033 1.037 1.029 1.030 1.042 1.047 1.042 1.046
Jul 1.019 1.035 1.018 1.028 1.043 1.047 1.042 1.042
Aug 1.030 1.042 1.021 1.029 1.035 1.046 1.039 1.045
Sep 1.033 1.040 1.019 1.032 1.037 1.047 1.044 1.051
Oct 1.034 1.035 1.022 1.036 1.046 1.046 1.049 1.051
Nov 1.033 1.042 1.026 1.041 1.044 1.044 1.043  
Dec 1.036 1.052 1.033 1.036 1.043 1.045 1.042  

STP: Standard Temperature - 60°F, Standard Pressure - 14.7 psia
Measurement Standard: GPA 2172-09

* The data on this page represent an average heating value for the system and may differ from data that meets state or local regulatory requirements and is used for billing purposes. Accordingly, it is data provided solely for informational purposes, and not for billing purposes. WPS makes no claim or representation that the data provided is accurate and makes no warranties express or implied, including but not limited to fitness for a particular purpose, including EPA compliance. No party should rely on such data, including, but not limited to, for billing purposes.

If you need or want more than consumption and heating value information, an independent natural gas analysis service provider can help.