Delhi: Calling it their trump card against the Congress government this election year, Delhi Bharatiya Janata Party (BJP) said it will hold a rally against power tariff hike, in Ramlila Maidan on Sunday.br br Delhi party president Vijay Goel announced on Saturday that BJP would reveal the 10-point formula to reduce power tariff by at least 30 per cent in the city.br br The rally will be addressed by BJP national president Rajnath Singh, Leader of Opposition in Rajya Sabha Arun Jaitley, Delhi election in-charge and former BJP chief Nitin Gadkari and Delhi election co-incharge Navjot br br Singh Sidhu, Leader of Opposition in Delhi Assembly Vijay Kumar Malhotra and Vijay Goel.