How to use Genesis Grid Loop plugin on a specific Category and show Excerpts. http://sridharkatakam.com/use-genesis-grid-loop-plugin-specific-category-show-excerpts/

functions.php

/**
 * Grid Loop on 'Category 1' category archive
 * Customized by Sridhar Katakam
 *
 * @author Bill Erickson
 * @link https://github.com/billerickson/Genesis-Grid/wiki/Home
 *
 * @param bool $grid, whether to use grid loop
 * @param object $query, the WP Query
 * @return bool
 */
function sk_grid_loop_on_specific_category( $grid, $query ) {
    if ( is_category( 'category-1' ) ) {
        $grid = true;
    }

    return $grid;
}
add_filter( 'genesis_grid_loop_section', 'sk_grid_loop_on_specific_category', 10, 2 );

/**
 * Use Excerpts for Features and Teasers in Grid Loop
 * Customized by Sridhar Katakam
 *
 * @author Bill Erickson
 * @link http://www.billerickson.net/code/full-content-features-in-grid-loop
 *
 * @param string $option
 * @return string $option
 */
function sk_excerpts_for_features_and_teasers( $option ) {
  if ( in_array( 'feature', get_post_class() ) || in_array( 'teaser', get_post_class() ) )
		$option = 'excerpts';
		
	return $option;
}
add_filter( 'genesis_pre_get_option_content_archive', 'sk_excerpts_for_features_and_teasers' );

//* Modify the length of post excerpts on 'Category 1' category archive
add_filter( 'excerpt_length', 'sp_excerpt_length' );
function sp_excerpt_length( $length ) {
	if ( ! is_category( 'category-1' ) ) {
        return;
    }
	return 250; // pull first 250 words
}

//* Modify the Excerpt read more link on 'Category 1' category archive
add_filter('excerpt_more', 'new_excerpt_more');
function new_excerpt_more($more) {
	if ( ! is_category( 'category-1' ) ) {
        return;
    }
    return '... <a class="more-link" href="' . get_permalink() . '">Read more</a>';
}

gistfile1.php

//* Show Featured images above Post titles on 'Category 1' category archive
add_action ( 'genesis_entry_header', 'sk_featured_image', 9 );
function sk_featured_image() {
	if ( ! is_category( 'category-1' ) || ! has_post_thumbnail() ) {
        return;
    }
    
    $image_args = array(
		'size' => 'full',
	);

	$image = genesis_get_image( $image_args );

	if ( $image ) {
		echo '<a href="' . get_permalink() . '">' . $image .'</a>';
	}
}