A hybrid fuel cell system (100,300) comprising: a high temperature fuel cell having an anode section and a cathode section; a gas turbine (103,303) comprising: a compressor section (103A,303A) configured to compress a supply gas, and an expansion section (103B,303B) configured to produce mechanical energy by expanding heated compressed supply gas, and/or a heated second gas derived from the compressed supply gas; a heat recovery unit configured to heat the compressed supply gas and/or the second gas using waste heat from the high temperature fuel cell before the heated compressed supply gas and/or the heated second gas is provided to the expansion section (103B,303B); an induction machine (105,305) configured to receive the mechanical energy produced by the expansion section (103B,303B), convert the mechanical energy to electrical energy, and produce an electrical output; wherein the induction machine (105,305) is adapted to connect to an electrical grid, and the system further comprises: a generator output breaker (105a,305a) configured to connect and disconnect the induction machine (105,305) from the electrical grid; and a controller (115,315) configured to control opening and closing of the generator output breaker (105a,305a) based on at least one of a speed of a rotor of the induction machine (105,305) and an amount of heat produced by the high temperature fuel cell. a high temperature fuel cell having an anode section and a cathode section; a gas turbine (103,303) comprising: a compressor section (103A,303A) configured to compress a supply gas, and an expansion section (103B,303B) configured to produce mechanical energy by expanding heated compressed supply gas, and/or a heated second gas derived from the compressed supply gas; a compressor section (103A,303A) configured to compress a supply gas, and an expansion section (103B,303B) configured to produce mechanical energy by expanding heated compressed supply gas, and/or a heated second gas derived from the compressed supply gas; a heat recovery unit configured to heat the compressed supply gas and/or the second gas using waste heat from the high temperature fuel cell before the heated compressed supply gas and/or the heated second gas is provided to the expansion section (103B,303B); an induction machine (105,305) configured to receive the mechanical energy produced by the expansion section (103B,303B), convert the mechanical energy to electrical energy, and produce an electrical output; wherein the induction machine (105,305) is adapted to connect to an electrical grid, and the system further comprises: a generator output breaker (105a,305a) configured to connect and disconnect the induction machine (105,305) from the electrical grid; and a controller (115,315) configured to control opening and closing of the generator output breaker (105a,305a) based on at least one of a speed of a rotor of the induction machine (105,305) and an amount of heat produced by the high temperature fuel cell. a generator output breaker (105a,305a) configured to connect and disconnect the induction machine (105,305) from the electrical grid; and a controller (115,315) configured to control opening and closing of the generator output breaker (105a,305a) based on at least one of a speed of a rotor of the induction machine (105,305) and an amount of heat produced by the high temperature fuel cell.