Enforcement Interest Rates
Interest Rates
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The Commission, on a quarterly basis, publishes interest rates for oil, natural gas, and electricity for determination of refund purposes. The interest rates on this page as well as the archived rates are the same for oil, natural gas, and electricity. Please note that the interest rates for oil apply only as far back as 1983.
- Electric Interest Rates are Calculated in Accordance with Section 35.19a of the Commission's regulations
- Gas Interest Rates are Calculated in Accordance with Section 154.501(d) of the Commission's regulations and its predecessors
- Oil Interest Rates are Calculated in Accordance with Section 340.1(c)(2) of the Commission's regulations
Applicable Annual Quarter | Annual Rate | Monthly Rate (Annual % / 365dx # days in month) 1 |
Monthly Rate (Annual Rate / 12 Months) |
---|---|---|---|
First Quarter 2017 | 3.50% | Mar .0030 | .0029 |
Feb .0027 | |||
Jan .0030 | |||
Fourth Quarter 2016 | 3.50% | Dec .0030 | .0029 |
Nov .0029 | |||
Oct .0030 | |||
Third Quarter 2016 | 3.50 % | Sep .0029 | .0029 |
Aug .0030 | |||
Jul .0030 | |||
Second Quarter 2016 | 3.46% | Jun .0028 | .0029 |
May .0029 | |||
Apr .0028 | |||
First Quarter 2016 | 3.25% | Mar .0028 | .0027 |
Feb .0026 | |||
Jan .0028 | |||
Fourth Quarter 2015 | 3.25% | Dec .0028 | .0027 |
Nov .0027 | |||
Oct .0028 | |||
Third Quarter 2015 | 3.25% | Sep .0027 | .0027 |
Aug .0028 | |||
July .0028 | |||
Second Quarter 2015 | 3.25% | June .0027 | .0027 |
May .0028 | |||
Apr .0027 | |||
First Quarter 2015 | 3.25% | Mar .0028 | .0027 |
Feb .0025 | |||
Jan .0028 | |||
Fourth Quarter 2014 | 3.25% | Dec .0028 | .0027 |
Nov .0027 | |||
Oct .0028 | |||
Third Quarter 2014 | 3.25% | Sep .0027 | .0027 |
Aug .0028 | |||
Jul .0028 | |||
Second Quarter 2014 | 3.25% | Jun .0027 | .0027 |
May .0028 | |||
Apr .0027 | |||
First Quarter 2014 | 3.25% | Mar .0028 | .0027 |
Feb .0025 | |||
Jan .0028 | |||
Fourth Quarter 2013 | 3.25% | Dec .0028 | .0027 |
Nov .0027 | |||
Oct .0028 | |||
Third Quarter 2013 | 3.25% | Sep .0027 | .0027 |
Aug .0028 | |||
Jul .0028 | |||
Second Quarter 2013 | 3.25% | Jun .0027 | .0027 |
May .0028 | |||
Apr .0027 | |||
First Quarter 2013 | 3.25% | Mar .0028 | .0027 |
Feb .0025 | |||
Jan .0028 | |||
Fourth Quarter 2012 | 3.25% | Dec .0028 | .0027 |
Nov .0027 | |||
Oct .0028 | |||
Third Quarter 2012 | 3.25% | Sep .0027 | .0027 |
Aug .0028 | |||
Jul .0028 | |||
Second Quarter 2012 | 3.25% | Jun .0027 | .0027 |
May .0028 | |||
Apr .0027 | |||
First Quarter 2012 | 3.25% | Mar .0028 | .0027 |
Feb .0026 | |||
Jan .0028 | |||
Fourth Quarter 2011 | 3.25% | Dec .0028 | .0027 |
Nov .0027 | |||
Oct .0028 | |||
Third Quarter 2011 | 3.25% | Sep .0027 | .0027 |
Aug .0028 | |||
Jul .0027 | |||
Second Quarter 2011 | 3.25% | Jun .0027 | .0027 |
May .0028 | |||
Apr .0027 | |||
First Quarter 2011 | 3.25% | Mar .0028 | .0027 |
Feb .0025 | |||
Jan .0028 | |||
Fourth Quarter 2010 | 3.25% | Dec .0028 | .0027 |
Nov .0027 | |||
Oct .0028 | |||
Third Quarter 2010 | 3.25% | Sep .0027 | .0027 |
Aug .0028 | |||
Jul .0028 | |||
Second Quarter 2010 | 3.25% | Jun .0027 | .0027 |
May .0028 | |||
Apr .0027 | |||
First Quarter 2010 | 3.25% | Mar .0028 | .0027 |
Feb .0025 | |||
Jan .0028 | |||
Fourth Quarter 2009 | 3.25% | Dec .0028 | .0027 |
Nov .0027 | |||
Oct .0028 | |||
Third Quarter 2009 | 3.25% | Sep .0027 | .0027 |
Aug .0028 | |||
Jul .0028 | |||
Second Quarter 2009 | 3.37% | Jun .0028 | .0028 |
May .0029 | |||
Apr .0028 | |||
First Quarter 2009 | 4.52% | Mar .0038 | .0038 |
Feb .0034 | |||
Jan .0038 | |||
Fourth Quarter 2008 | 5.00% | Oct .0042 | .0042 |
Nov .0041 | |||
Dec .0042 | |||
Third Quarter 2008 | 5.30% | Jul .0045 | .0044 |
Aug .0045 | |||
Sep .0044 | |||
Second Quarter 2008 | 6.77% | Jun .0056 | .0056 |
May .0057 | |||
Apr .0056 | |||
First Quarter 2008 | 7.76% | Mar .0066 | .0065 |
Feb .0062 | |||
Jan .0066 | |||
Fourth Quarter 2007 | 8.25% | Oct. .0070 | .0069 |
Nov. 0068 | |||
Dec. .0070 | |||
Third Quarter 2007 | 8.25% | Sep .0068 | .0069 |
Aug .0070 | |||
Jul .0070 | |||
Second Quarter 2007 | 8.25% | Jun .0068 | .0069 |
May .0070 | |||
Apr .0068 | |||
First Quarter 2007 | 8.25% | Mar .0070 | .0069 |
Feb .0063 | |||
Jan .0070 |