** Renewable power firm FuelCell Energy FCEL.O shares down 17.6% before the bell Weds to $21.38 after overnight follow-on priced

** FCEL late Tues announced ~10.7 mln shares at $21 for $225 mln gross proceeds

** Offering size increased from $200 mln and priced at 19.1% discount to stock's last sale

** FCEL intends to use net offering proceeds for capex to expand manufacturing capacity, working capital and general purposes

** Citigroup and Barclays joint bookrunners, along with Oppenheimer, RBC and Goldman Sachs

** Danbury, Connecticut-based FCEL has ~67.6 mln shares outstanding

** FCEL shares fell nearly 13% on Tues but have more than quadrupled over the past three months

** Avg rating of 8 analysts is "hold"; median PT $23, per LSEG data