Kraftverk i drift taget i 1921

27 anläggningar togs i drift 1921 • 449 MW total kapacitet

#	Kraftverk	Land	Kapacitet (MW)
1	Pit 1	Amerikas forenta stater	69.2
2	Unteraa (Lungerersee)	Schweiz	54
3	Forshuvudforsen power plant	Sverige	44
4	Rochester 5	Amerikas forenta stater	43.6
5	Kern River 3	Amerikas forenta stater	40.3
6	Colton	Amerikas forenta stater	36
7	Oo	Frankrike	30
8	Krakerud	Sverige	22
9	Lockhart	Amerikas forenta stater	18
10	Weston Hydro	Amerikas forenta stater	12
11	Shoshone Falls	Amerikas forenta stater	11.5
12	Hat Creek 2	Amerikas forenta stater	10
13	Hat Creek 1	Amerikas forenta stater	10
14	Kern Canyon	Amerikas forenta stater	9.5
15	Ashton	Amerikas forenta stater	6.7
16	Kamargo	Amerikas forenta stater	6
17	Spring Gap	Amerikas forenta stater	6
18	Hamilton Branch	Amerikas forenta stater	5.3
19	Waterport	Amerikas forenta stater	4
20	Knife Falls	Amerikas forenta stater	2.4
21	Franklin (CA)	Amerikas forenta stater	2
22	Kearney Hydro	Amerikas forenta stater	1.5
23	Kearney	Amerikas forenta stater	1.5
24	Graniteville Enterprise Division	Amerikas forenta stater	1.2
25	Wallowa Falls	Amerikas forenta stater	1.1
26	Oconto Falls Upper	Amerikas forenta stater	1.1
27	Longreach Powerhouse	Australien	0