Upon commencement of commercial operation of each new utility unit under subpart 1 of part B, the unit shall comply with the requirements of subsection (a)(1).
( ( Upon ( commencement ( of ( ( commercial operation ) ( of ( ( each ( new ( utility unit ) ) ) ( under ( ( subpart 1 ) ( of ( part B ) ) ) ) ) ) ) ) ) ) ( , ( ( the unit ) ( ( shall ( comply ( with ( ( the requirements ) ( of ( ( subsection ( -LRB- ( a -RRB- ) ) ) ( -LRB- ( 1 -RRB- ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Upon) (NP (NP (NN commencement)) (PP (IN of) (NP (NP (JJ commercial) (NN operation)) (PP (IN of) (NP (NP (DT each) (JJ new) (NN utility) (NN unit)) (PP (IN under) (NP (NP (NN subpart) (CD 1)) (PP (IN of) (NP (NN part) (NN B))))))))))) (, ,) (NP (DT the) (NN unit)) (VP (MD shall) (VP (VB comply) (PP (IN with) (NP (NP (DT the) (NNS requirements)) (PP (IN of) (NP (NP (NP (NN subsection)) (PRN (-LRB- -LRB-) (X (SYM a)) (-RRB- -RRB-))) (PRN (-LRB- -LRB-) (NP (CD 1)) (-RRB- -RRB-)))))))) (. .)))
the unit shall comply with the requirements of subsection a1 under certain conditions.
( ( the unit ) ( ( shall ( ( comply ( with ( ( the requirements ) ( of ( subsection a1 ) ) ) ) ) ( under ( certain conditions ) ) ) ) . ) )
(ROOT (S (NP (DT the) (NN unit)) (VP (MD shall) (VP (VB comply) (PP (IN with) (NP (NP (DT the) (NNS requirements)) (PP (IN of) (NP (NN subsection) (NNS a1))))) (PP (IN under) (NP (JJ certain) (NNS conditions))))) (. .)))