In 2009, LEGO released 7 Power Functions sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included Accessories and Trains. For that year, the total price of all retail sets cost $120, today those sets are valued around $308, a growth of 157%.
Most valuable 2009 LEGO Power Functions set
8878 Rechargeable Battery Box $131.02
Highest growth 2009 Power Functions set
8871 Extension Cable 50cm +403.76%
Largest 2009 LEGO Power Functions set
8866 Train Motor 7 pieces
Most owned 2009 Power Functions set
8879 IR Speed Remote Control
7 sets

8866 Train Motor

Theme / Subtheme Power Functions / Trains
Year 2009
Pieces 7
Availability Retired
8866 LEGO Power Functions Train Motor
Retail $10.99
Value $31.04
Growth  +182.4%
Annual growth 4.4%

8869 Polarity Switch

Theme / Subtheme Power Functions / Accessories
Year 2009
Pieces 1
Availability Retired
8869 LEGO Power Functions Polarity Switch
Retail $5.79
Value $16.96
Growth  +192.9%
Annual growth 4.6%

8870 Light Set

Theme / Subtheme Power Functions / Accessories
Year 2009
Pieces 1
Availability Retired
8870 LEGO Power Functions Light Set
Retail $6.49
Value $14.99
Growth  +131.0%
Annual growth 3.2%

8871 Extension Cable 50cm

Theme / Subtheme Power Functions / Accessories
Year 2009
Pieces 1
Availability Retired
8871 LEGO Power Functions Extension Cable 50cm
Retail $3.99
Value $20.10
Growth  +403.8%
Annual growth 9.7%

8878 Rechargeable Battery Box

Theme / Subtheme Power Functions / Accessories
Year 2009
Pieces 1
Availability Retired
8878 LEGO Power Functions Rechargeable Battery Box
Retail $49.99
Value $131.02
Growth  +162.1%
Annual growth 9.3%

8879 IR Speed Remote Control

Theme / Subtheme Power Functions / Accessories
Year 2009
Pieces 1
Availability Retired
8879 LEGO Power Functions IR Speed Remote Control
Retail $12.99
Value $44.97
Growth  +246.2%
Annual growth 7.4%

8887 Transformer 10V DC

Theme / Subtheme Power Functions / Accessories
Year 2009
Pieces 1
Availability Retired
8887 LEGO Power Functions Transformer 10V DC
Retail $29.99
Value $49.33
Growth  +64.5%
Annual growth 3.8%