Method and system for deploying an electric submersible pump in a live well

A method for installing an electric submersible pump (ESP) in a well, comprising:

• installing at least one plug in the well below a well tree;
• closing an upper master valve and a lower master valve in the well tree;
• removing valve closure elements from the lower master valve and replacing the closure elements with gate seats and a replacement gate block, the replacement gate block comprising a seat for a cable hanger;
• opening the upper master valve;
• removing the at least one plug;
• and
• extending the ESP into the well on the end of an electrical cable;
• and
• affixing the cable hanger to the electrical cable and seating the cable hanger in the seat, the cable hanger comprising sealing elements to engage the seat and an electrical connector, the electrical connector oriented to enable access through a horizontal bore in the replacement gate block.