By Shivangi Acharya and Riddhima Talwani

NEW DELHI India's economy grew at its fastest pace in a year in the April-June quarter, driven by services and manufacturing, data is expected to show on Thursday, though economists warn of a slowdown ahead.

According to the median forecast in a Reuters poll of economists, India's gross domestic product (GDP) grew 7.7% in the past quarter, up from 6.1% growth in the previous quarter and its fastest expansion since April-June 2022.

Economists say lower commodity prices helped manufacturers increase margins and offset the impact of 250 basis points of cumulative interest rate increases since May 2022.

Suvodeep Rakshit, economist at Kotak Institutional Equities said he expected growth to be driven by services on the output side and investment on the expenditure side.

Strong growth in India's services sector, which makes up more than half of its economic output, has helped Asia's third-largest economy buck the global slowdown that has left many major economies, including China, stuttering.

S&P Global India services Purchasing Managers' Index has remained firmly above the 50-mark separating growth from contraction for nearly two years, the longest stretch since August 2011.

To support growth, Indian government has been front-loading its annual spending on infrastructure. In the first three months of the fiscal year that started on April 1, India had spent nearly 28% of its capital expenditure budget of 10 trillion Indian rupees ($120.91 billion).

Deutsche Bank's chief India economist Kaushik Das said a 3% decline in wholesale prices will also contribute to the strong headline growth by reducing the "GDP deflator" used to calculate real economic growth by stripping out price changes.

MODERATION AHEAD

Economists say that price effect could reverse in coming months, and growth could cool off.

After above average rainfall in July, August has been uncharacteristically arid, which pushed up prices of food staples, curtailing discretionary spending.

Dry weather could also hit agriculture output and eat into power of the population in India's hinterlands where a majority depend on agricultural income.

Additionally, slowing global growth and exports and a comparison with higher growth rates a year ago will also weigh on growth in quarters ahead.

"There is some evidence that sequentially the activity is slowing," said Rahul Bajoria, economists at Barclays. "The widespread consensus in the market is that things will slow down."

($1 = 82.7084 Indian rupees)

(Writing by Aftab Ahmed; Editing by Tomasz Janowski)