exercises a like influence in communities where there is no water power:
“It, or its subsidiaries, has acquired control of or an interest in the public-service corporations of numerous cities where there is no water-power connection, and it is affiliated with still others by virtue of common directors.... This vast network of relationship between hydro-electric corporations through prominent officers and directors of the largest manufacturer of electrical machinery and supplies in the United States is highly significant.... “It is possible that this relationship to such a large number of strong financial concerns, through common officers and directors, affords the General Electric Co. an advantage that may place rivals at a corresponding disadvantage. Whether or not this great financial power has been used to the particular disadvantage of any rival water-power concern is not so important as the fact that such power exists and that it might be so used at any time.”