I believe most are attempts to sell power factor correction gear to home owners.
With out proper survey and application of power factor correction capacitors, these capacitors will cause you to use more power.
Read up on power factor correction, some of the new meters are counting power consumed at lower power factor.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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