BUZZ-Centrica: most exposed UK energy utility to election risk-DB
** Centrica (LSE: CNA.L - news) weakens in robust volume as Deutsche Bank cuts rating to "sell" vs "hold" on risk around knife-edge UK election, to which DB says Centrica looks most exposed of UK energy utilities
** Stock down 1.7 pct, taking its falls since an early Feb peak to c.16 pct
** Centrica's shares could be worth at least 20 pct less under a Labour-led government than a Conservative one, DB says
** DB says valuation gap could be much bigger given Labour leader Ed Miliband's mooted 10 pct energy retail price cut would wipe out Centrica's group earnings
** SSE (LSE: SSE.L - news) and National Grid (LSE: NG.L - news) also exposed, DB says; two stocks broadly flat (RM (LSE: RM.L - news) : tricia.wright1.thomsonreuters.com@reuters.net)