| 1992 | Total Purchased Electricity Consumption | 6,493,815 | kWh |
| 1993 | Total Purchased Electricity Consumption | 6,384,866 | kWh |
| 1994 | Total Purchased Electricity Consumption | 7,192,976 | kWh |
| 1995 | Total Purchased Electricity Consumption | 8,096,936 | kWh |
| 1996 | Total Purchased Electricity Consumption | 8,504,914 | kWh |
| 1997 | Total Purchased Electricity Consumption | 8,268,007 | kWh |
| 1998 | Total Purchased Electricity Consumption | 8,427,120 | kWh |
| 1999 | Total Purchased Electricity Consumption | 8,877,984 | kWh |
| 2000 | Total Purchased Electricity Consumption | 8,924,333 | kWh |
| 2001 | Total Purchased Electricity Consumption | 9,444,943 | kWh |
| 2002 | Total Purchased Electricity Consumption | 9,708,971 | kWh |
| 2003 | Total Purchased Electricity Consumption | 12,116,944 | kWh |
| 2004 | Total Purchased Electricity Consumption | 12,616,588 | kWh |
| 2005 | Total Purchased Electricity Consumption | 13,842,236 | kWh |
| 2006 | Total Purchased Electricity Consumption | 14,685,607 | kWh |
| 2007 | Total Purchased Electricity Consumption | 15,741,484 | kWh |
| 2008 | Total Purchased Electricity Consumption | 13,968,277 | kWh |
| 2009 | Total Purchased Electricity Consumption | 14,408,818 | kWh |
| 2010 | Total Purchased Electricity Consumption | 14,849,359 | kWh |
| 2010 | Voluntary unbundled RECs Purchased | 14,850,000 | kWh |
| 2010 | Voluntary unbundled RECs Verification | Not verified | |
| 2011 | Total Purchased Electricity Consumption | 15,089,539 | kWh |
| 2011 | Voluntary unbundled RECs Purchased | 15,090,000 | kWh |
| 2011 | Voluntary unbundled RECs Verification | Not verified | |
| 2012 | Total Purchased Electricity Consumption | 14,052,477 | kWh |
| 2012 | Voluntary unbundled RECs Purchased | 14,053,000 | kWh |
| 2012 | Voluntary unbundled RECs Verification | Not verified | |
| 2013 | Total Purchased Electricity Consumption | 15,428,893 | kWh |
| 2013 | Voluntary unbundled RECs Purchased | 15,429,000 | kWh |
| 2013 | Voluntary unbundled RECs Verification | Not verified | |
| 2014 | Total Purchased Electricity Consumption | 14,116,117 | kWh |
| 2014 | Voluntary unbundled RECs Purchased | 14,117,000 | kWh |
| 2014 | Voluntary unbundled RECs Verification | Not verified | |
| 2015 | Total Purchased Electricity Consumption | 13,938,181 | kWh |
| 2015 | Voluntary unbundled RECs Purchased | 14,000,000 | kWh |
| 2015 | Voluntary unbundled RECs Verification | Not verified | |
| 2016 | Total Purchased Electricity Consumption | 14,178,552 | kWh |
| 2016 | Voluntary unbundled RECs Purchased | 14,179,000 | kWh |
| 2016 | Voluntary unbundled RECs Verification | Not verified | |
| 2017 | Total Purchased Electricity Consumption | 14,203,339 | kWh |
| 2017 | Voluntary unbundled RECs Purchased | 14,204,000 | kWh |
| 2017 | Voluntary unbundled RECs Verification | Green-e | |
| 2018 | Total Purchased Electricity Consumption | 14,311,548 | kWh |
| 2018 | Voluntary unbundled RECs Purchased | 14,312,000 | kWh |
| 2018 | Voluntary unbundled RECs Verification | Green-e | |
| 2019 | Total Purchased Electricity Consumption | 15,477,637 | kWh |
| 2019 | Voluntary unbundled RECs Purchased | 15,478,000 | kWh |
| 2019 | Voluntary unbundled RECs Verification | Green-e | |
| 2020 | Total Purchased Electricity Consumption | 13,837,595 | kWh |
| 2020 | Voluntary unbundled RECs Purchased | 14,000,000 | kWh |
| 2020 | Voluntary unbundled RECs Verification | Green-e | |
| 2021 | Total Purchased Electricity Consumption | 12,333,895 | kWh |
| 2021 | Voluntary unbundled RECs Purchased | 14,000,000 | kWh |
| 2021 | Voluntary unbundled RECs Verification | Green-e | |